2MASS J09393548-2448279

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Brown dwarf
2MASS J09393548-2448279
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Water snake
Right ascension 09 h 39 m 35.48 s
declination -24 ° 48 ′ 27.9 ″
Apparent brightness J-band: (15.61 ± 0.09) mag
distance 17.4 ± 0.4  ly
(5.34 ± 0.13  pc )
Proper movement
Rec. Share: (+0.573 ± 0.002) mas / a
Dec. portion: (−1.045 ± 0.003) mas / a
Typing
Spectral class T8
Physical Properties

2MASS J09393548-2448279 is probably a double system consisting of two brown dwarfs . The object belongs to the spectral class T8, lies in the constellation Hydra and is around 17 light years away from Earth. It was made by Tinney et al. identified as a brown dwarf by analyzing the 2MASS survey data (publication 2005). Model calculations indicate that it is a system of two brown dwarfs with effective temperatures of around 500 and 700 Kelvin and masses of around 25 and 40 Jupiter masses, but a pair with temperatures of 600 K and 30 Jupiter masses each would also be possible. The components of the suspected system are among the coolest brown dwarfs known.

literature

  • CG Tinney, Adam J. Burgasser, J. Davy Kirkpatrick, Michael W. McElwain: The 2MASS Wide-Field T Dwarf Search. IV. Hunting Out T Dwarfs with Methane Imaging . In: The Astronomical Journal . tape 130 , no. 5 , 2005, ISSN  1538-3881 , p. 2326 ff ., doi : 10.1086 / 491734 , bibcode : 2005AJ .... 130.2326T ( iopscience.iop.org ).
  • Adam J. Burgasser, CG Tinney, Michael C. Cushing, Didier Saumon, Mark S. Marley, Clara S. Bennett, J. Davy Kirkpatrick: 2MASS J09393548–2448279: The Coldest and Least Luminous Brown Dwarf Binary Known? In: The Astrophysical Journal Letters . tape 689 , no. 1 , November 20, 2008, p. L53 – L56 , doi : 10.1086 / 595747 , bibcode : 2008ApJ ... 689L..53B ( iop.org ).
  • SK Leggett, Michael C. Cushing, D. Saumon, MS Marley, TL Roellig, SJ Warren, Ben Burningham, HRA Jones, JD Kirkpatrick, N. Lodieu, PW Lucas, AK Mainzer, EL Martín, MJ McCaughrean, DJ Pinfield, GC Sloan, RL Smart, M. Tamura, J. Van Cleve: The Physical Properties of Four ~ 600 KT Dwarfs . In: The Astrophysical Journal . tape 695 , no. 2 , April 7, 2009, p. 1517 ff ., doi : 10.1088 / 0004-637X / 695/2/1517 , bibcode : 2009ApJ ... 695.1517L .