[ { "key": "49DX44LD", "version": 10987, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/49DX44LD", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/49DX44LD", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/35222/items/6G89ZAMK", "type": "application/json" } }, "meta": { "createdByUser": { "id": 1115709, "username": "juodvarnis", "name": "Andrius Popovas", "links": { "alternate": { "href": "https://www.zotero.org/juodvarnis", "type": "text/html" } } }, "numChildren": 0 }, "data": { "key": "49DX44LD", "version": 10987, "parentItem": "6G89ZAMK", "itemType": "attachment", "linkMode": "imported_url", "title": "Kitchatinov - 2018 - Large-Scale Magnetic Field Fragmentation in Flux-T.pdf", "accessDate": "2018-10-16T08:54:30Z", "url": "https://arxiv.org/pdf/1810.06210.pdf", "note": "", "contentType": "application/pdf", "charset": "", "filename": "Kitchatinov - 2018 - Large-Scale Magnetic Field Fragmentation in Flux-T.pdf", "md5": "ccfbd88889f6a85c763d94572f602541", "mtime": 1539680074000, "tags": [], "relations": {}, "dateAdded": "2018-10-16T08:54:30Z", "dateModified": "2018-10-16T08:54:34Z" } }, { "key": "6G89ZAMK", "version": 10986, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/6G89ZAMK", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/6G89ZAMK", "type": "text/html" } }, "meta": { "createdByUser": { "id": 1115709, "username": "juodvarnis", "name": "Andrius Popovas", "links": { "alternate": { "href": "https://www.zotero.org/juodvarnis", "type": "text/html" } } }, "creatorSummary": "Kitchatinov", "parsedDate": "2018-10-15", "numChildren": 2 }, "data": { "key": "6G89ZAMK", "version": 10986, "itemType": "journalArticle", "title": "Large-Scale Magnetic Field Fragmentation in Flux-Tubes Near the Base of the Solar Convection Zone", "creators": [ { "creatorType": "author", "firstName": "Leonid L.", "lastName": "Kitchatinov" } ], "abstractNote": "Magnetic quenching of turbulent thermal diffusivity leads to instability of the large-scale field with the production of spatially isolated regions of enhanced field. This conclusion follows from a linear stability analysis in the framework of mean-field magnetohydrodynamics that allows for thermal diffusivity dependence on the magnetic field. The characteristic growth time of the instability is short compared to the 11-year period of solar activity. The characteristic scale of the increased field regions measures in tens of mega-meters. The instability can produce magnetic inhomogeneities whose buoyant rise to the solar surface forms the solar active regions. The magnetic energy of the field concentrations coincides in order of magnitude with the energy of the active regions.", "publicationTitle": "arXiv:1810.06210 [astro-ph]", "publisher": "", "place": "", "date": "2018-10-15", "volume": "", "issue": "", "section": "", "partNumber": "", "partTitle": "", "pages": "", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "", "citationKey": "", "url": "http://arxiv.org/abs/1810.06210", "accessDate": "2018-10-16T08:54:33Z", "PMID": "", "PMCID": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "en", "libraryCatalog": "arXiv.org", "callNumber": "", "rights": "", "extra": "arXiv: 1810.06210", "tags": [ { "tag": "Astrophysics - Solar and Stellar Astrophysics", "type": 1 } ], "collections": [], "relations": {}, "dateAdded": "2018-10-16T08:54:33Z", "dateModified": "2018-10-16T08:54:34Z" } }, { "key": "8443P6C4", "version": 10986, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/8443P6C4", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/8443P6C4", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/35222/items/6G89ZAMK", "type": "application/json" } }, "meta": { "createdByUser": { "id": 1115709, "username": "juodvarnis", "name": "Andrius Popovas", "links": { "alternate": { "href": "https://www.zotero.org/juodvarnis", "type": "text/html" } } }, "numChildren": 0 }, "data": { "key": "8443P6C4", "version": 10986, "parentItem": "6G89ZAMK", "itemType": "note", "note": "Comment: to apper in Astronomy Letters, 7 pages", "tags": [], "relations": {}, "dateAdded": "2018-10-16T08:54:33Z", "dateModified": "2018-10-16T08:54:33Z" } }, { "key": "H4M8SXBX", "version": 10960, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/H4M8SXBX", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/H4M8SXBX", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/35222/items/6RC8XSCZ", "type": "application/json" } }, "meta": { "createdByUser": { "id": 1383066, "username": "troelsfrostholm", "name": "", "links": { "alternate": { "href": "https://www.zotero.org/troelsfrostholm", "type": "text/html" } } }, "numChildren": 0 }, "data": { "key": "H4M8SXBX", "version": 10960, "parentItem": "6RC8XSCZ", "itemType": "note", "note": "Comment: 10 pages, 9 figures; submitted to MNRAS", "tags": [], "relations": {}, "dateAdded": "2017-03-30T07:07:16Z", "dateModified": "2017-03-30T07:08:11Z" } }, { "key": "6RC8XSCZ", "version": 10959, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/6RC8XSCZ", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/6RC8XSCZ", "type": "text/html" } }, "meta": { "createdByUser": { "id": 1383066, "username": "troelsfrostholm", "name": "", "links": { "alternate": { "href": "https://www.zotero.org/troelsfrostholm", "type": "text/html" } } }, "creatorSummary": "Carrera et al.", "parsedDate": "2017-03-25", "numChildren": 1 }, "data": { "key": "6RC8XSCZ", "version": 10959, "itemType": "journalArticle", "title": "Toward an initial mass function for giant planets", "creators": [ { "creatorType": "author", "firstName": "Daniel", "lastName": "Carrera" }, { "creatorType": "author", "firstName": "Melvyn B.", "lastName": "Davies" }, { "creatorType": "author", "firstName": "Anders", "lastName": "Johansen" } ], "abstractNote": "The distribution of exoplanet masses is not primordial. After the initial stage of planet formation is complete, the gravitational interactions between planets can lead to the physical collision of two planets, or the ejection of one or more planets from the system. When this occurs, the remaining planets are typically left in more eccentric orbits. Here we use present-day eccentricities of the observed exoplanet population to reconstruct the initial mass function of exoplanets before the onset of dynamical instability. We developed a Bayesian framework that combines data from N-body simulations with present-day observations to compute a probability distribution for the planets that were ejected or collided in the past. Integrating across the exoplanet population, we obtained an estimate of the initial mass function of exoplanets. We find that the ejected planets are primarily sub-Saturn type planets. While the present-day distribution appears to be bimodal, with peaks around $\\sim 1 M_{\\rm J}$ and $\\sim 20 M_\\oplus$, this bimodality does not seem to be primordial. Instead, planets around $\\sim 60 M_\\oplus$ appear to be preferentially removed by dynamical instabilities. Attempts to reproduce exoplanet populations using population synthesis codes should be mindful of the fact that the present population has been depleted of intermediate-mass planets. Future work should explore how the system architecture and multiplicity might alter our results.", "publicationTitle": "arXiv:1703.08647 [astro-ph]", "publisher": "", "place": "", "date": "2017-03-25", "volume": "", "issue": "", "section": "", "partNumber": "", "partTitle": "", "pages": "", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "", "citationKey": "", "url": "http://arxiv.org/abs/1703.08647", "accessDate": "2017-03-30T07:07:16Z", "PMID": "", "PMCID": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "arXiv.org", "callNumber": "", "rights": "", "extra": "arXiv: 1703.08647", "tags": [ { "tag": "Astrophysics - Earth and Planetary Astrophysics", "type": 1 } ], "collections": [ "5RCHCMAH" ], "relations": {}, "dateAdded": "2017-03-30T07:07:16Z", "dateModified": "2017-03-30T07:07:16Z" } }, { "key": "DNDDQ394", "version": 10948, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/DNDDQ394", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/DNDDQ394", "type": "text/html" } }, "meta": { "createdByUser": { "id": 1383066, "username": "troelsfrostholm", "name": "", "links": { "alternate": { "href": "https://www.zotero.org/troelsfrostholm", "type": "text/html" } } }, "lastModifiedByUser": { "id": 1115709, "username": "juodvarnis", "name": "Andrius Popovas", "links": { "alternate": { "href": "https://www.zotero.org/juodvarnis", "type": "text/html" } } }, "creatorSummary": "Zhu and Stone", "parsedDate": "2017-01-17", "numChildren": 2 }, "data": { "key": "DNDDQ394", "version": 10948, "itemType": "journalArticle", "title": "Global Evolution of an Accretion Disk with Net Vertical Field: Coronal Accretion, Flux Transport, and Disk Winds", "creators": [ { "creatorType": "author", "firstName": "Zhaohuan", "lastName": "Zhu" }, { "creatorType": "author", "firstName": "James M.", "lastName": "Stone" } ], "abstractNote": "We report new global ideal MHD simulations for thin accretion disks threaded by net vertical magnetic fields. Our computations span three orders of magnitude in radius, extend all the way to the pole, and are evolved for more than one viscous time over the inner decade in radius. Static mesh refinement is used to properly resolve MRI. We find that:(1) inward accretion occurs mostly in the upper magnetically dominated regions of the disk, similar to the \"coronal accretion\" in previous GRMHD simulations. Rapid inflow in the upper layers combined with slow outflow at the midplane creates strong $R\\phi$ and $z\\phi$ stresses in the mean field; the vertically integrated $\\alpha\\sim 0.5-1$ when the initial field has $\\beta_{0}=10^3$ at the midplane. (2) A quasi-static global field geometry is established in which flux transport by inflows at the surface is balanced by turbulent diffusion. The field is strongly pinched inwards at the surface. A steady-state advection-diffusion model, with turbulent magnetic Prandtl number of order unity, reproduces this geometry well. (3) Weak unsteady disk winds are launched at $z/R\\sim1$ with the Alfven radius $R_{A}/R_{0}\\sim3$. Although the wind is episodic, the time averaged properties are well described by steady wind theory. Wind is not efficient at transporting angular momentum. Even with $\\beta_{0}=10^3$, only 5% of the angular momentum transport is driven by torque from the wind, and the wind mass flux from the inner decade of radius is only $\\sim$ 0.4% of the mass accretion rate. With weaker fields or thinner disks, the wind contributes even less. (4) Most of the disk accretion is driven by the $R\\phi$ stress from the MRI and global magnetic fields. Our simulations may shed light on high $\\alpha$ in CVs, high near-IR flux in Herbig stars, fast inflow in transitional disks, outflow in FUors, and the transport of chondrites in our solar system.", "publicationTitle": "arXiv:1701.04627 [astro-ph]", "publisher": "", "place": "", "date": "2017-01-17", "volume": "", "issue": "", "section": "", "partNumber": "", "partTitle": "", "pages": "", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "", "citationKey": "", "url": "http://arxiv.org/abs/1701.04627", "accessDate": "2017-01-21T10:32:17Z", "PMID": "", "PMCID": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "Global Evolution of an Accretion Disk with Net Vertical Field", "language": "", "libraryCatalog": "arXiv.org", "callNumber": "", "rights": "", "extra": "00000 \narXiv: 1701.04627", "tags": [ { "tag": "Astrophysics - Earth and Planetary Astrophysics", "type": 1 } ], "collections": [ "VPB683TD" ], "relations": {}, "dateAdded": "2017-01-21T10:32:17Z", "dateModified": "2017-01-21T21:09:40Z" } }, { "key": "UQZSME94", "version": 10946, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/UQZSME94", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/UQZSME94", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/35222/items/DNDDQ394", "type": "application/json" } }, "meta": { "createdByUser": { "id": 1383066, "username": "troelsfrostholm", "name": "", "links": { "alternate": { "href": "https://www.zotero.org/troelsfrostholm", "type": "text/html" } } }, "numChildren": 0 }, "data": { "key": "UQZSME94", "version": 10946, "parentItem": "DNDDQ394", "itemType": "note", "note": "

Comment: 27 pages, 28 figures, Submitted to the AAS Journals

", "tags": [], "relations": {}, "dateAdded": "2017-01-21T10:32:17Z", "dateModified": "2017-01-21T10:32:46Z" } }, { "key": "G9X94NGZ", "version": 10947, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/G9X94NGZ", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/G9X94NGZ", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/35222/items/DNDDQ394", "type": "application/json" } }, "meta": { "createdByUser": { "id": 1383066, "username": "troelsfrostholm", "name": "", "links": { "alternate": { "href": "https://www.zotero.org/troelsfrostholm", "type": "text/html" } } } }, "data": { "key": "G9X94NGZ", "version": 10947, "parentItem": "DNDDQ394", "itemType": "attachment", "linkMode": "imported_url", "title": "arXiv.org Snapshot", "accessDate": "2017-01-21T10:32:19Z", "url": "https://arxiv.org/abs/1701.04627", "note": "", "contentType": "text/html", "charset": "utf-8", "filename": "1701.html", "md5": "7e586168c9604f17444bc87f0bd62573", "mtime": 1484994739000, "tags": [], "relations": {}, "dateAdded": "2017-01-21T10:32:19Z", "dateModified": "2017-01-21T10:32:19Z" } }, { "key": "I7PUCE2H", "version": 10937, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/I7PUCE2H", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/I7PUCE2H", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/35222/items/SCM29G4V", "type": "application/json" } }, "meta": { "createdByUser": { "id": 853493, "username": "colinmcnally", "name": "Colin McNally", "links": { "alternate": { "href": "https://www.zotero.org/colinmcnally", "type": "text/html" } } }, "lastModifiedByUser": { "id": 1831319, "username": "tgrassi", "name": "", "links": { "alternate": { "href": "https://www.zotero.org/tgrassi", "type": "text/html" } } }, "numChildren": 0 }, "data": { "key": "I7PUCE2H", "version": 10937, "parentItem": "SCM29G4V", "itemType": "note", "note": "

Comment: 40 pages, 47 figures, submitted to MNRAS

", "tags": [], "relations": {}, "dateAdded": "2013-11-06T07:07:14Z", "dateModified": "2016-11-08T13:49:25Z" } }, { "key": "M83NBBXQ", "version": 10935, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/M83NBBXQ", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/M83NBBXQ", "type": "text/html" } }, "meta": { "createdByUser": { "id": 1383066, "username": "troelsfrostholm", "name": "", "links": { "alternate": { "href": "https://www.zotero.org/troelsfrostholm", "type": "text/html" } } }, "lastModifiedByUser": { "id": 1115709, "username": "juodvarnis", "name": "Andrius Popovas", "links": { "alternate": { "href": "https://www.zotero.org/juodvarnis", "type": "text/html" } } }, "creatorSummary": "Klaassen et al.", "parsedDate": "2016-04-25", "numChildren": 2 }, "data": { "key": "M83NBBXQ", "version": 10935, "itemType": "journalArticle", "title": "The Winds from HL Tau", "creators": [ { "creatorType": "author", "firstName": "Pamela D.", "lastName": "Klaassen" }, { "creatorType": "author", "firstName": "Joseph C.", "lastName": "Mottram" }, { "creatorType": "author", "firstName": "Luke T.", "lastName": "Maud" }, { "creatorType": "author", "firstName": "Attila", "lastName": "Juhasz" } ], "abstractNote": "Outflowing motions, whether a wind launched from the disk, a jet launched from the protostar, or the entrained molecular outflow, appear to be an ubiquitous feature of star formation. These outwards motions have a number of root causes, and how they manifest is intricately linked to their environment as well as the process of star formation itself. Using the ALMA Science Verification data of HL Tau, we investigate the high velocity molecular gas being removed from the system as a result of the star formation process. We aim to place these motions in context with the optically detected jet, and the disk. With these high resolution ($\\sim 1\"$) ALMA observations of CO (J=1-0), we quantify the outwards motions of the molecular gas. We find evidence for a bipolar outwards flow, with an opening angle, as measured in the red-shifted lobe, starting off at 90$^\\circ$, and narrowing to 60$^\\circ$ further from the disk, likely because of magnetic collimation. Its outwards velocity, corrected for inclination angle is of order 2.4 km s$^{-1}$.", "publicationTitle": "arXiv:1604.07285 [astro-ph]", "publisher": "", "place": "", "date": "2016-04-25", "volume": "", "issue": "", "section": "", "partNumber": "", "partTitle": "", "pages": "", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "", "citationKey": "", "url": "http://arxiv.org/abs/1604.07285", "accessDate": "2016-05-06T09:54:51Z", "PMID": "", "PMCID": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "arXiv.org", "callNumber": "", "rights": "", "extra": "00000 \narXiv: 1604.07285", "tags": [ { "tag": "Astrophysics - Astrophysics of Galaxies", "type": 1 }, { "tag": "Astrophysics - Solar and Stellar Astrophysics", "type": 1 } ], "collections": [ "BSTCHHG3" ], "relations": {}, "dateAdded": "2016-05-06T09:54:51Z", "dateModified": "2016-05-20T08:35:10Z" } }, { "key": "PAIMN23F", "version": 10933, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/PAIMN23F", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/PAIMN23F", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/35222/items/M83NBBXQ", "type": "application/json" } }, "meta": { "createdByUser": { "id": 1383066, "username": "troelsfrostholm", "name": "", "links": { "alternate": { "href": "https://www.zotero.org/troelsfrostholm", "type": "text/html" } } } }, "data": { "key": "PAIMN23F", "version": 10933, "parentItem": "M83NBBXQ", "itemType": "attachment", "linkMode": "imported_url", "title": "arXiv.org Snapshot", "accessDate": "2016-05-06T09:54:53Z", "url": "http://arxiv.org/abs/1604.07285", "note": "", "contentType": "text/html", "charset": "utf-8", "filename": "1604.html", "md5": "309d67ba7c3475b7aa53e86abc0fd16c", "mtime": 1462528492000, "tags": [], "relations": {}, "dateAdded": "2016-05-06T09:54:53Z", "dateModified": "2016-05-06T09:54:53Z" } }, { "key": "4ZZAEXGQ", "version": 10932, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/4ZZAEXGQ", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/4ZZAEXGQ", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/35222/items/M83NBBXQ", "type": "application/json" } }, "meta": { "createdByUser": { "id": 1383066, "username": "troelsfrostholm", "name": "", "links": { "alternate": { "href": "https://www.zotero.org/troelsfrostholm", "type": "text/html" } } }, "numChildren": 0 }, "data": { "key": "4ZZAEXGQ", "version": 10932, "parentItem": "M83NBBXQ", "itemType": "note", "note": "Comment: 8 Pages, 8 figures, 3 tables. To appear in MNRAS", "tags": [], "relations": {}, "dateAdded": "2016-05-06T09:54:51Z", "dateModified": "2016-05-06T09:54:51Z" } }, { "key": "CNRXJ4B7", "version": 10930, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/CNRXJ4B7", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/CNRXJ4B7", "type": "text/html" } }, "meta": { "createdByUser": { "id": 1383066, "username": "troelsfrostholm", "name": "", "links": { "alternate": { "href": "https://www.zotero.org/troelsfrostholm", "type": "text/html" } } }, "lastModifiedByUser": { "id": 1115709, "username": "juodvarnis", "name": "Andrius Popovas", "links": { "alternate": { "href": "https://www.zotero.org/juodvarnis", "type": "text/html" } } }, "creatorSummary": "Vorobyov et al.", "parsedDate": "2016-01-29", "numChildren": 2 }, "data": { "key": "CNRXJ4B7", "version": 10930, "itemType": "journalArticle", "title": "An alternative model for the origin of gaps in circumstellar disks", "creators": [ { "creatorType": "author", "firstName": "Eduard I.", "lastName": "Vorobyov" }, { "creatorType": "author", "firstName": "Zsolt", "lastName": "Regaly" }, { "creatorType": "author", "firstName": "Manuel", "lastName": "Guedel" }, { "creatorType": "author", "firstName": "D. N. C.", "lastName": "Lin" } ], "abstractNote": "Motivated by recent observational and numerical studies suggesting that collapsing protostellar cores may be replenished from the local environment, we explore the evolution of protostellar cores submerged in the external counter-rotating environment. These models predict the formation of counter-rotating disks with a deep gap in the gas surface density separating the inner disk (corotating with the star) and the outer counter-rotating disk. The properties of these gaps are compared to those of planet-bearing gaps that form in disks hosting giant planets. We employ numerical hydrodynamics simulations of collapsing cores that are replenished from the local counter-rotating environment, as well as numerical hydrodynamic simulations of isolated disks hosting giant planets, to derive the properties of the gaps that form in both cases. Our numerical simulations demonstrate that counter-rotating disks can form for a wide range of mass and angular momentum available in the local environment. The gap that separates both disks has a depletion factor smaller than 1%, can be located at a distance from ten to over a hundred AU from the star, and can propagate inward with velocity ranging from 1 AU/Myr to >100 AU/Myr. Unlike our previous conclusion, the gap can therefore be a long-lived phenomenon, comparable in some cases to the lifetime of the disk itself. For a proper choice of the planetary mass, the viscous \\alpha-parameter and the disk mass, the planet-bearing gaps and the gaps in counter-rotating disks may show a remarkable similarity in the gas density profile and depletion factor, which may complicate their observational differentiation.", "publicationTitle": "arXiv:1601.08089 [astro-ph]", "publisher": "", "place": "", "date": "2016-01-29", "volume": "", "issue": "", "section": "", "partNumber": "", "partTitle": "", "pages": "", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "", "citationKey": "", "url": "http://arxiv.org/abs/1601.08089", "accessDate": "2016-02-04T15:16:14Z", "PMID": "", "PMCID": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "arXiv.org", "callNumber": "", "rights": "", "extra": "00000 \narXiv: 1601.08089", "tags": [ { "tag": "Astrophysics - Earth and Planetary Astrophysics", "type": 1 }, { "tag": "Astrophysics - 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"href": "https://www.zotero.org/gopakumr", "type": "text/html" } } }, "creatorSummary": "Seifried et al.", "parsedDate": "2016-01-11", "numChildren": 3 }, "data": { "key": "JC7TGCAP", "version": 10924, "itemType": "journalArticle", "title": "Revealing the dynamics of Class 0 protostellar discs with ALMA", "creators": [ { "creatorType": "author", "firstName": "D.", "lastName": "Seifried" }, { "creatorType": "author", "firstName": "Á", "lastName": "Sánchez-Monge" }, { "creatorType": "author", "firstName": "S.", "lastName": "Walch" }, { "creatorType": "author", "firstName": "R.", "lastName": "Banerjee" } ], "abstractNote": "We present synthetic ALMA observations of Keplerian, protostellar discs in the Class 0 stage studying the emission of molecular tracers like $^{13}$CO, C$^{18}$O, HCO$^+$, H$^{13}$CO$^+$, N$_2$H$^+$, and H$_2$CO. We model the emission of discs around low- and intermediate-mass protostars. We show that under optimal observing conditions ALMA is able to detect the discs already in the earliest stage of protostellar evolution, although the emission is often concentrated to the innermost 50 AU. Therefore, a resolution of a few 0.1\" might be too low to detect Keplerian discs around Class 0 objects. We also demonstrate that under optimal conditions Keplerian rotation signatures are recognisable and protostellar masses can be determined with high fidelity for edge-on discs. Furthermore, we show that it is possible to reveal Keplerian rotation even for strongly inclined discs and that ALMA should be able to detect possible signs of fragmentation in face-on discs. In order to give some guidance for future ALMA observations, we investigate the influence of varying observing conditions and source distances. We show that it is possible to probe Keplerian rotation in inclined discs with an observing time of 2 h and a resolution of 0.1\", even in the case of moderate weather conditions. Furthermore, we demonstrate that under optimal conditions, Keplerian discs around intermediate-mass protostars should be detectable up to kpc-distances.", "publicationTitle": "arXiv:1601.02384 [astro-ph]", "publisher": "", "place": "", "date": "2016-01-11", "volume": "", "issue": "", "section": "", "partNumber": "", "partTitle": "", "pages": "", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "", "citationKey": "", "url": "http://arxiv.org/abs/1601.02384", "accessDate": "2016-01-18T10:22:21Z", "PMID": "", "PMCID": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "arXiv.org", "callNumber": "", "rights": "", "extra": "arXiv: 1601.02384", "tags": [ { "tag": "Astrophysics - Astrophysics of Galaxies", "type": 1 }, { "tag": "Astrophysics - Solar and Stellar Astrophysics", "type": 1 } ], "collections": [ "QKW6Z68F" ], "relations": {}, "dateAdded": "2016-01-18T10:22:21Z", "dateModified": "2016-01-18T10:22:21Z" } }, { "key": "GME5CPCK", "version": 10925, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/GME5CPCK", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/GME5CPCK", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/35222/items/8WP84WQD", "type": "application/json" } }, "meta": { "createdByUser": { "id": 1567224, "username": "gopakumr", "name": "Gopakumar Mohandas", "links": { "alternate": { "href": "https://www.zotero.org/gopakumr", "type": "text/html" } } }, "numChildren": 0 }, "data": { "key": "GME5CPCK", "version": 10925, "parentItem": "8WP84WQD", "itemType": "attachment", "linkMode": "imported_url", "title": "arXiv:1601.01921 PDF", "accessDate": "2016-01-18T10:21:54Z", "url": "http://www.arxiv.org/pdf/1601.01921.pdf", "note": "", "contentType": "application/pdf", "charset": "", "filename": "Richard et al. - 2016 - Vortex formation in protoplanetary discs induced b.pdf", "md5": "ccd66d5762a89c74b92b0f67039bee73", "mtime": 1453112529000, "tags": [], "relations": {}, "dateAdded": "2016-01-18T10:21:54Z", "dateModified": "2016-01-18T10:22:09Z" } }, { "key": "PAF6F9MK", "version": 10925, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/PAF6F9MK", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/PAF6F9MK", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/35222/items/8WP84WQD", "type": "application/json" } }, "meta": { "createdByUser": { "id": 1567224, "username": "gopakumr", "name": "Gopakumar Mohandas", "links": { "alternate": { "href": "https://www.zotero.org/gopakumr", "type": "text/html" } } } }, "data": { "key": "PAF6F9MK", "version": 10925, "parentItem": "8WP84WQD", "itemType": "attachment", "linkMode": "imported_url", "title": "arXiv.org Snapshot", "accessDate": "2016-01-18T10:21:56Z", "url": "http://arxiv.org/abs/1601.01921", "note": "", "contentType": "text/html", "charset": "utf-8", "filename": "1601.html", "md5": "339ca7a3c54759a1aba8eaa61a62785a", "mtime": 1453112516000, "tags": [], "relations": {}, "dateAdded": "2016-01-18T10:21:56Z", "dateModified": "2016-01-18T10:21:56Z" } }, { "key": "8WP84WQD", "version": 10924, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/8WP84WQD", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/8WP84WQD", "type": "text/html" } }, "meta": { "createdByUser": { "id": 1567224, "username": "gopakumr", "name": "Gopakumar Mohandas", "links": { "alternate": { "href": "https://www.zotero.org/gopakumr", "type": "text/html" } } }, "creatorSummary": "Richard et al.", "parsedDate": "2016-01-08", "numChildren": 3 }, "data": { "key": "8WP84WQD", "version": 10924, "itemType": "journalArticle", "title": "Vortex formation in protoplanetary discs induced by the vertical shear instability", "creators": [ { "creatorType": "author", "firstName": "Samuel", "lastName": "Richard" }, { "creatorType": "author", "firstName": "Richard P.", "lastName": "Nelson" }, { "creatorType": "author", "firstName": "Orkan M.", "lastName": "Umurhan" } ], "abstractNote": "We present the results of 2D and 3D hydrodynamic simulations of idealized protoplanetary discs that examine the formation and evolution of vortices by the vertical shear instability (VSI). In agreement with recent work, we find that discs with radially decreasing temperature profiles and short thermal relaxation time-scales, are subject to the axisymmetric VSI. In three dimensions, the resulting velocity perturbations give rise to quasi-axisymmetric potential vorticity perturbations that break-up into discrete vortices, in a manner that is reminiscent of the Rossby wave instability. Discs with very short thermal evolution time-scales (i.e. {\\tau}<0.1 local orbit periods) develop strong vorticity perturbations that roll up into vortices that have small aspect ratios ({\\chi}<2) and short lifetimes (~ a few orbits). Longer thermal time-scales give rise to vortices with larger aspect ratios (6<{\\chi}<10), and lifetimes that depend on the entropy gradient. A steeply decreasing entropy profile leads to vortex lifetimes that exceed the simulation run times of hundreds of orbital periods. Vortex lifetimes in discs with positive or weakly decreasing entropy profiles are much shorter, being 10s of orbits at most, suggesting that the subcritical baroclinic instability plays an important role in sustaining vortices against destruction through the elliptical instability. Applied to the outer regions of protoplanetary discs, where the VSI is most likely to occur, our results suggest that vortices formed by the VSI are likely to be short lived structures.", "publicationTitle": "arXiv:1601.01921 [astro-ph]", "publisher": "", "place": "", "date": "2016-01-08", "volume": "", "issue": "", "section": "", "partNumber": "", "partTitle": "", "pages": "", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "", "citationKey": "", "url": "http://arxiv.org/abs/1601.01921", "accessDate": "2016-01-18T10:21:54Z", "PMID": "", "PMCID": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "arXiv.org", "callNumber": "", "rights": "", "extra": "arXiv: 1601.01921", "tags": [ { "tag": "Astrophysics - Earth and Planetary Astrophysics", "type": 1 } ], "collections": [ "QKW6Z68F" ], "relations": {}, "dateAdded": "2016-01-18T10:21:54Z", "dateModified": "2016-01-18T10:21:54Z" } }, { "key": "P2UD84QM", "version": 10919, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/P2UD84QM", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/P2UD84QM", "type": "text/html" } }, "meta": { "createdByUser": { "id": 2025344, "username": "jonramsey", "name": "", "links": { "alternate": { "href": "https://www.zotero.org/jonramsey", "type": "text/html" } } }, "lastModifiedByUser": { "id": 1115709, "username": "juodvarnis", "name": "Andrius Popovas", "links": { "alternate": { "href": "https://www.zotero.org/juodvarnis", "type": "text/html" } } }, "creatorSummary": "Hocuk et al.", "parsedDate": "2015-11-20", "numChildren": 3 }, "data": { "key": "P2UD84QM", "version": 10919, "itemType": "journalArticle", "title": "How chemistry influences cloud structure, star formation, and the IMF", "creators": [ { "creatorType": "author", "firstName": "S.", "lastName": "Hocuk" }, { "creatorType": "author", "firstName": "S.", "lastName": "Cazaux" }, { "creatorType": "author", "firstName": "M.", "lastName": "Spaans" }, { "creatorType": "author", "firstName": "P.", "lastName": "Caselli" } ], "abstractNote": "In the earliest phases of star-forming clouds, stable molecular species, such as CO, are important coolants in the gas phase. Depletion of these molecules on dust surfaces affects the thermal balance of molecular clouds and with that their whole evolution. For the first time, we study the effect of grain surface chemistry (GSC) on star formation and its impact on the initial mass function (IMF). We follow a contracting translucent cloud in which we treat the gas-grain chemical interplay in detail, including the process of freeze-out. We perform 3d hydrodynamical simulations under three different conditions, a pure gas-phase model, a freeze-out model, and a complete chemistry model. The models display different thermal evolution during cloud collapse. The equation of state (EOS) of the gas becomes softer with CO freeze-out and the results show that at the onset of star formation, the cloud retains its evolution history such that the number of formed stars differ (by 7%) between the three models. While the stellar mass distribution results in a different IMF when we consider pure freeze-out, with the complete treatment of the GSC, the divergence from a pure gas-phase model is minimal. We find that the impact of freeze-out is balanced by the non-thermal processes; chemical and photodesorption. We also find an average filament width of 0.12 pc ($\\pm$0.03 pc), and speculate that this may be a result from the changes in the EOS caused by the gas-dust thermal coupling. We conclude that GSC plays a big role in the chemical composition of molecular clouds and that surface processes are needed to accurately interpret observations, however, that GSC does not have a significant impact as far as star formation and the IMF is concerned.", "publicationTitle": "arXiv:1511.06696 [astro-ph]", "publisher": "", "place": "", "date": "2015-11-20", "volume": "", "issue": "", "section": "", "partNumber": "", "partTitle": "", "pages": "", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "", "citationKey": "", "url": "http://arxiv.org/abs/1511.06696", "accessDate": "2015-12-07T13:23:30Z", "PMID": "", "PMCID": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "arXiv.org", "callNumber": "", "rights": "", "extra": "00000 \narXiv: 1511.06696", "tags": [ { "tag": "Astrophysics - Astrophysics of Galaxies", "type": 1 }, { "tag": "Astrophysics - Solar and Stellar Astrophysics", "type": 1 } ], "collections": [ "I24CHVF5" ], "relations": {}, "dateAdded": "2015-12-07T13:23:30Z", "dateModified": "2015-12-10T12:58:41Z" } }, { "key": "NS8XRZZW", "version": 10919, "library": { "type": "group", "id": 35222, "name": "coffee-and-astro-ph", "links": { "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/35222/items/NS8XRZZW", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/coffee-and-astro-ph/items/NS8XRZZW", "type": "text/html" } }, "meta": { "createdByUser": { "id": 2025344, "username": "jonramsey", "name": "", "links": { "alternate": { "href": "https://www.zotero.org/jonramsey", "type": "text/html" } } }, "lastModifiedByUser": { "id": 1115709, "username": "juodvarnis", "name": "Andrius Popovas", "links": { "alternate": { "href": "https://www.zotero.org/juodvarnis", "type": "text/html" } } }, "creatorSummary": "Simon et al.", "parsedDate": "2015-11-30", "numChildren": 3 }, "data": { "key": "NS8XRZZW", "version": 10919, "itemType": "journalArticle", "title": "The Initial Mass and Size Distribution of Planetesimals. I. The Effect of Resolution, Gravity, and Initial Conditions in Streaming Instability Calculations", "creators": [ { "creatorType": "author", "firstName": "Jacob B.", "lastName": "Simon" }, { "creatorType": "author", "firstName": "Philip J.", "lastName": "Armitage" }, { "creatorType": "author", "firstName": "Rixin", "lastName": "Li" }, { "creatorType": "author", "firstName": "Andrew N.", "lastName": "Youdin" } ], "abstractNote": "We study the formation of planetesimals in protoplanetary disks from the gravitational collapse of solid over-densities generated via the streaming instability. To carry out these studies, we implement and test a particle-mesh self-gravity module for the Athena code that enables the simulation of aerodynamically coupled systems of gas and collisionless self-gravitating solid particles. Upon employment of our algorithm to planetesimal formation simulations, we find that (when a direct comparison is possible) the Athena simulations yield predicted planetesimal properties that agree well with those found in prior work using different numerical techniques. In particular, the gravitational collapse of streaming-initiated clumps leads to an initial planetesimal mass function that is well-represented by a power-law, dN/dM ~ M^(-p),with p = 1.6 +/- 0.1. We find no significant trends with resolution from a convergence study of up to 512^3 grid zones and N_par ~ 1.5x10^8 particles. Likewise, the power-law slope appears indifferent to changes in the relative strength of self-gravity and tidal shear, and to the time when (for reasons of numerical economy) self-gravity is turned on, though the strength of these claims is limited by small number statistics. For a typically assumed radial distribution of minimum mass solar nebula solids (assumed here to have dimensionless stopping time {\\tau} = 0.3), our results support the hypothesis that bodies on the scale of large asteroids or Kuiper Belt Objects could have formed as the high-mass tail of a primordial planetesimal population.", "publicationTitle": "arXiv:1512.00009 [astro-ph]", "publisher": "", "place": "", "date": "2015-11-30", "volume": "", "issue": "", "section": "", "partNumber": "", "partTitle": "", "pages": "", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "", "citationKey": "", "url": "http://arxiv.org/abs/1512.00009", "accessDate": "2015-12-07T13:24:51Z", "PMID": "", "PMCID": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "arXiv.org", "callNumber": "", "rights": "", "extra": "00000 \narXiv: 1512.00009", "tags": [ { "tag": "Astrophysics - Earth and Planetary Astrophysics", "type": 1 }, { "tag": "Astrophysics - Solar and Stellar Astrophysics", "type": 1 } ], "collections": [ "I24CHVF5" ], "relations": {}, "dateAdded": "2015-12-07T13:24:51Z", "dateModified": "2015-12-10T12:58:35Z" } } ]