C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST15:31:32

2014A&A...566L...3S - Astronomy and Astrophysics, volume 566, L3-3 (2014/6-1)

Old pre-main-sequence stars. Disc reformation by Bondi-Hoyle accretion.


Abstract (from CDS):

Young stars show evidence of accretion discs which evolve quickly and disperse with an e-folding time of ∼3Myr. This is in striking contrast with recent observations that suggest evidence of numerous >30Myr 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.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - protoplanetary disks - circumstellar matter - stars: formation - stars: pre-main sequence

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
2 NAME 30 Dor Region reg 05 38.0 -69 06           ~ 178 0
3 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1734 1
4 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 940 1

    Equat.    Gal    SGal    Ecl

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