WISE J1147-2040

WISE J1147-2040
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 11h 47m 24.214s[1]
Declination −20° 40′ 20.44″[1]
Characteristics
Evolutionary stage Brown dwarf
or a rogue planet
Spectral type L7V[1]
Astrometry
Distance102 ± 12 ly
(31.3 ± 3.8[2] pc)
Details
Mass5–10[3] MJup
Radius2.08 RJup
Temperature1500 ± 100[2] K
1100–1200[2] K
Age10 ± 3[2] Myr
Other designations
WISEA 1147, 2MASS J11472421-2040204, WISEA J114724.10-204021.3
Database references
SIMBADdata

WISEA 1147 is a brown dwarf in the TW Hydrae association, a nearby group of very young stars and brown dwarfs.[4][5] The object is notable because its estimate mass, 6±1 times the mass of Jupiter, places it in the mass range for planets.[6] Nevertheless, it is a free-floating object, unassociated with any star system.[7]

The brown dwarf was discovered using information from NASA's WISE (Wide-field Infrared Survey Explorer) and the 2MASS (Two Micron All-Sky Survey). Researchers inferred the young age for WISEA 1147 because it is a member of a group of stars that is only 10 million years old, and they estimated its mass using evolutionary models for brown dwarf cooling.

References

  1. 1 2 3 "2MASS J11472421-2040204". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 March 2017.
  2. 1 2 3 4 Schneider, Adam C.; Windsor, James; Cushing, Michael C.; Kirkpatrick, J. Davy; Wright, Edward L. (2016). "Wisea J114724.10-204021.3: A Free-Floating Planetary Mass Member of the Tw Hya Association". The Astrophysical Journal. 822: L1. arXiv:1603.07985. Bibcode:2016ApJ...822L...1S. doi:10.3847/2041-8205/822/1/L1.
  3. ↑ "NASA spots free-floating brown dwarf in deep space". MSN. 22 April 2016. Archived from the original on 27 April 2016. Retrieved 30 April 2016.
  4. ↑ "Lone Planetary-Mass Object Found in Family of Stars". NASA. 19 April 2016. Retrieved 21 April 2016.
  5. ↑ Kennell, Joanne. "Astronomers Spot a Lonely Planet-Like Object Floating Freely in Space". The Science Explorer. Retrieved 21 April 2016.
  6. ↑ Best, William M. J.; Liu, Michael C.; Dupuy, Trent J.; Magnier, Eugene A. (2017). "The Young L Dwarf 2MASS J11193254−1137466 Is a Planetary-mass Binary". The Astrophysical Journal. 843 (1): L4. arXiv:1706.01883. Bibcode:2017ApJ...843L...4B. doi:10.3847/2041-8213/aa76df. ISSN 2041-8213.
  7. ↑ Newcomb, Alyssa (20 April 2016). "Lonely Planet Unattached to a Star Found in Deep Space". ABC News. Retrieved 21 April 2016.


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