Details

Autor(en) / Beteiligte

• Burgasser, Adam J
• Tinney, C. G
• Cushing, Michael C
• Saumon, Didier
• Marley, Mark S
• Bennett, Clara S
• Kirkpatrick, J. Davy

Titel

2MASS J09393548–2448279: The Coldest and Least Luminous Brown Dwarf Binary Known?

Ist Teil von

• The Astrophysical journal, 2008-12, Vol.689 (1), p.L53-L56

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2008

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Determinations of the luminosity and atmospheric properties of the T8 brown dwarf 2MASS J09393548-2448279 are presented, based on Spitzer IRAC and IRS observations and ground-based astrometry. We find [image] for this source, comparable to the current low-luminosity record holder 2MASS J04151954-0935066. However, modeling of near- and mid-infrared spectral data indicates an effective temperature of [image] K, roughly 100 K cooler than 2M0415. These parameters require a highly inflated radius for 2M0939 ([image] R sub([image])) which cannot be reconciled with brown dwarf structure models. However, if this source is an unresolved, equal-mass binary, then the reduced luminosity of each component can be brought into agreement with the inferred atmospheric parameters for an age of 0.4-12 Gyr and component masses of 0.01-0.05 M sub([image]). This hypothesis can be tested through future high-resolution imaging and/or spectroscopic observations.