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

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

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...689l..53b&link_type=abstract

The Astrophysical Journal, Volume 689, Issue 1, pp. L53-L56.

Astronomy and Astrophysics

Astronomy

20

Stars: Binaries: Close, Stars: Fundamental Parameters, Stars: Individual (2Mass J04151954-0935066), Stars: Individual (2Mass J09393548-2448279), Stars: Low-Mass, Brown Dwarfs

Scientific paper

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/Lsolar)=-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 Rsolar) 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 Lsolar) 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 Msolar. This hypothesis can be tested through future high-resolution imaging and/or spectroscopic observations.

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