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Title:
2MASS J09393548-2448279: The Coldest and Least Luminous Brown Dwarf Binary Known?
Authors:
Burgasser, Adam J.; Tinney, C. G.; Cushing, Michael C.; Saumon, Didier; Marley, Mark S.; Bennett, Clara S.; Kirkpatrick, J. Davy
Affiliation:
AA(Massachusetts Institute of Technology, Kavli Institute for Astrophysics and Space Research, Building 37, Room 664B, 77 Massachusetts Avenue, Cambridge, MA 02139 ), AB(Department of Astrophysics, School of Physics, University of New South Wales, NSW 2052, Australia.), AC(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822.), AD(Los Alamos National Laboratory, Applied Physics Division, MS F663, Los Alamos, NM 87545.), AE(NASA Ames Research Center, MS 254-3, Moffett Field, CA 94035.), AF(Massachusetts Institute of Technology, Kavli Institute for Astrophysics and Space Research, Building 37, Room 664B, 77 Massachusetts Avenue, Cambridge, MA 02139 ), AG(Infrared Processing Analysis Center, MS 100-22, California Institute of Technology, Pasadena, CA 91125.)
Publication:
The Astrophysical Journal, Volume 689, Issue 1, pp. L53-L56. (ApJL Homepage)
Publication Date:
12/2008
Origin:
UCP
Astronomy Keywords:
Stars: Binaries: Close, Stars: Fundamental Parameters, stars: individual (2MASS J04151954-0935066), stars: individual (2MASS J09393548-2448279), Stars: Low-Mass, Brown Dwarfs
DOI:
10.1086/595747
Bibliographic Code:
2008ApJ...689L..53B

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/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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