Astrometric and Spectroscopic Confirmation of a Brown Dwarf Companion to GSC 08047-00232

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dc.creatorChauvin, G.
dc.creatorLagrange, A. -M.
dc.creatorLacombe, F.
dc.creatorDumas, C.
dc.creatorMouillet, D.
dc.creatorZuckerman, B.
dc.creatorGendron, E.
dc.creatorSong, I.
dc.creatorBeuzit, J. -L.
dc.creatorLowrance, P.
dc.creatorFusco, T.
dc.date2004-12-21
dc.date.accessioned2026-07-07T02:16:24Z
dc.date.available2026-07-07T02:16:24Z
dc.descriptionWe report VLT/NACO imaging observations of the stars GSC 08047-00232 and HIP 6856, probable members of the large Tucana-Horologium association. During our previous ADONIS/SHARPII deep imaging survey, a substellar candidate companion was discovered around each star. Based on VLT/NACO astrometric measurements, we find that GSC 08047-00232 and the faint candidate companion near to it share the same proper motion with a significance of 3.1sigma. On the contrary, the candidate companion to HIP 6856 is probably a background object with a significance of 4.3sigma. We also detect a new fainter and closer candidate companion to HIP 6856, but which is likely a background object too with a significance of 4sigma. Recent VLT/NACO spectroscopic measurements of GSC 08047-00232 finally confirm the substellar nature of this young brown dwarf with a derived spectral type M9.5. GSC 08047-00232 B, with an estimated mass of 25MJup and an effective temperature of 2100K, is presently the third substellar companion identified among young, nearby associations.
dc.description8 pages, 4 figures, A&A accepted
dc.identifierhttps://arxiv.org/abs/astro-ph/0412548
dc.identifierhttp://arxiv.org/abs/astro-ph/0412548
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8775
dc.subjectAstrophysics
dc.titleAstrometric and Spectroscopic Confirmation of a Brown Dwarf Companion to GSC 08047-00232
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