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26 April 2024 |
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Disks around Young Brown Dwarfs | | Michael C. Liu
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22 Jul 2002 | | Subject: | astro-ph | | Affiliation: | IfA/Hawaii | | Abstract: | We present some results from a systematic survey for disks around spectroscopically identified young brown dwarfs and very low mass stars. We find that ~75% of our sample show intrinsic IR excesses, indicative of circum(sub)stellar disks. The observed excesses are correlated with Halpha emission, consistent with a common disk accretion origin. Because the excesses are modest, conventional analyses using only IR colors would have missed most of the sources with disks. In the same star-forming regions, we find that disks around brown dwarfs and T Tauri stars are contemporaneous; assuming coevality, this demonstrates that substellar disks are at least as long-lived as stellar disks. Altogether, the frequency and properties of circumstellar disks are similar from the stellar regime down to the substellar and planetary-mass regime. This offers compelling evidence of a common origin for most stars and brown dwarfs. | | Source: | arXiv, astro-ph/0207477 | | Services: | Forum | Review | PDF | Favorites | |
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