2MASS J09393548-2448279: The Coldest and Least Luminous Brown Dwarf Binary Known?
Abstract
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 log10(Lbol/L⊙) = - 5.69 +/- 0.03 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 600 +/- 35 K, roughly 100 K cooler than 2M0415. These parameters require a highly inflated radius for 2M0939 (R ≈ 0.13 R⊙) 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 (Lbol ≈ 10-6 L⊙) 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⊙. This hypothesis can be tested through future high-resolution imaging and/or spectroscopic observations.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 2008
- DOI:
- 10.1086/595747
- Bibcode:
- 2008ApJ...689L..53B
- Keywords:
-
- binaries: close;
- stars: fundamental parameters;
- stars: individual: 2MASS J04151954–0935066 2MASS J09393548–2448279;
- stars: low-mass;
- brown dwarfs