Can AB Dor C be a Tight Binary Brown Dwarf?

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dc.creatorMarois, C.
dc.creatorMacintosh, B.
dc.creatorSong, I.
dc.creatorBarman, T.
dc.date2005-02-18
dc.date2005-02-23
dc.date.accessioned2026-07-07T02:17:01Z
dc.date.available2026-07-07T02:17:01Z
dc.descriptionAB Dor C, a low-mass companion to the young star AB Dor A has recently been imaged. Direct detection and astrometric observations have been used to solve the AB Dor C orbit and obtain a dynamical mass estimate. Near-infrared magnitudes and effective temperatures from models have then been compared with observed values. Models and observations disagree at more than the 2 sigma level. This result prompts Close et al. 2005 to claim that models are overestimating young low-mass object luminosities by roughly a factor of two. This claim is based on the hypothesis that the detected source, AB Dor C, is a single object. Another possible interpretation of the data that was not considered is that AB Dor C is an unresolved binary brown dwarf. Considering that 21 brown dwarfs companions have been found to date around stars and that three of them are confirmed or potential brown dwarf binaries (Gl569Ba & Bb, GL564B & C and Indi Ba & Bb), this suggests that brown dwarf binaries may constitute a significant fraction (14% +/- 8%) of the brown dwarf population around stars. For these reasons, the possibility that AB Dor C is an unresolved binary brown dwarf deserves attention.
dc.description3 pages, 1 figure, submitted to Nature "Brief Communications Arising". New "more friendly/portable" .pdf version to resolve compatibility issues encounter with some operating systems
dc.identifierhttps://arxiv.org/abs/astro-ph/0502382
dc.identifierhttp://arxiv.org/abs/astro-ph/0502382
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/9016
dc.subjectAstrophysics
dc.titleCan AB Dor C be a Tight Binary Brown Dwarf?
dc.typetext

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