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dc.contributor.authorScicluna, P.
dc.contributor.authorRosotti, G.
dc.contributor.authorTesti, L.
dc.contributor.authorDale, James
dc.date.accessioned2017-07-21T14:57:04Z
dc.date.available2017-07-21T14:57:04Z
dc.date.issued2014-06-09
dc.identifier.citationScicluna , 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.issn1432-0746
dc.identifier.otherPURE: 11151131
dc.identifier.otherPURE UUID: e2c5e22c-37ee-441a-a663-b1d22914948a
dc.identifier.otherBibtex: urn:26ebb16390575cd7621957d4038cddff
dc.identifier.otherScopus: 84902177416
dc.identifier.otherORCID: /0000-0001-5252-5771/work/62751041
dc.identifier.urihttp://hdl.handle.net/2299/19044
dc.descriptionP. 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.abstractYoung 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.extent4
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysics
dc.subjectaccretion, accretion disks, protoplanetary disks, circumstellar matter, stars: formation, stars: pre-main sequence
dc.titleOld pre-main-sequence stars. Disc reformation by Bondi-Hoyle accretionen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361/201423654
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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