dc.contributor.author | Scicluna, P. | |
dc.contributor.author | Rosotti, G. | |
dc.contributor.author | Testi, L. | |
dc.contributor.author | Dale, James | |
dc.date.accessioned | 2017-07-21T14:57:04Z | |
dc.date.available | 2017-07-21T14:57:04Z | |
dc.date.issued | 2014-06-09 | |
dc.identifier.citation | Scicluna , P , Rosotti , G , Testi , L & Dale , J 2014 , ' Old pre-main-sequence stars. Disc reformation by Bondi-Hoyle accretion ' , Astronomy & Astrophysics , vol. 566 , L3 . https://doi.org/10.1051/0004-6361/201423654 | |
dc.identifier.issn | 1432-0746 | |
dc.identifier.other | Bibtex: urn:26ebb16390575cd7621957d4038cddff | |
dc.identifier.other | ORCID: /0000-0001-5252-5771/work/62751041 | |
dc.identifier.uri | http://hdl.handle.net/2299/19044 | |
dc.description | P. Scicluna, G. Rosotti, J. E. Dale, and L. Testi, “Old pre-main-sequence stars. Disc reformation by Bondi-Hoyle accretion”, Astronomy & Astrophysics, Vol. 566, June 2014. This version of record is available online at: https://www.aanda.org/articles/aa/abs/2014/06/aa23654-14/aa23654-14.html Reproduced with Permission from Astronomy and Astrophysics, © ESO 2014. | |
dc.description.abstract | Young stars show evidence of accretion discs which evolve quickly and disperse with an e-folding time of ~3 Myr. This is in striking contrast with recent observations that suggest evidence of numerous >30 Myr old stars with an accretion disc in large star-forming complexes. We consider whether these observations of apparently old accretors could be explained by invoking Bondi-Hoyle accretion to rebuild a new disc around these stars during passage through a clumpy molecular cloud. We combine a simple Monte Carlo model to explore the capture of mass by such systems with a viscous evolution model to infer the levels of accretion that would be observed. We find that a significant fraction of stars may capture enough material via the Bondi-Hoyle mechanism to rebuild a disc of mass ≳1 minimum-mass solar nebula, and ≲10% accrete at observable levels at any given time. A significant fraction of the observed old accretors may be explained with our proposed mechanism. Such accretion may provide a chance for a second epoch of planet formation, and have unpredictable consequences for planetary evolution. | en |
dc.format.extent | 4 | |
dc.format.extent | 662590 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astronomy & Astrophysics | |
dc.subject | accretion, accretion disks, protoplanetary disks, circumstellar matter, stars: formation, stars: pre-main sequence | |
dc.title | Old pre-main-sequence stars. Disc reformation by Bondi-Hoyle accretion | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1051/0004-6361/201423654 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |