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- W3100953607 abstract "Young stars show evidence of accretion discs which evolve quickly and disperse with an e-folding time of $sim$ 3Myr. This is in striking contrast with recent observations that suggest evidence for 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 $gtrsim$ 1 minimum-mass solar nebula, and $lesssim 10%$ 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." @default.
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- W3100953607 date "2014-06-01" @default.
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- W3100953607 title "Old pre-main-sequence stars" @default.
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- W3100953607 doi "https://doi.org/10.1051/0004-6361/201423654" @default.
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