WISE J1147−2040

WISEA J114724.10−204021.3 (abbreviated WISEA 1147) is a brown dwarf in the TW Hydrae association, a nearby group of very young stars and brown dwarfs.[5][6] The object is notable because its estimate mass, 6±1 times the mass of Jupiter, places it in the mass range for rogue planets.[7] Nevertheless, it is a free-floating object, unassociated with any star system.[8]

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
Age7±2.5[4] Myr
Other designations
WISEA 1147, 2MASS J11472421−2040204, WISEA J114724.10−204021.3
Database references
SIMBADdata

The object 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. "2MASS J11472421-2040204". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 March 2017.
  2. 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 (1): L1. arXiv:1603.07985. Bibcode:2016ApJ...822L...1S. doi:10.3847/2041-8205/822/1/L1. S2CID 30068452.
  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. Vos, Johanna M.; Biller, Beth A.; Allers, Katelyn N.; Faherty, Jacqueline K.; Liu, Michael C.; Metchev, Stanimir; Eriksson, Simon; Manjavacas, Elena; Dupuy, Trent J.; Janson, Markus; Radigan-Hoffman, Jacqueline; Crossfield, Ian; Bonnefoy, Mickaël; Best, William M. J.; Homeier, Derek; Schlieder, Joshua E.; Brandner, Wolfgang; Henning, Thomas; Bonavita, Mariangela; Buenzli, Esther (2020). "Spitzer Variability Properties of Low-gravity L Dwarfs". The Astronomical Journal. 160 (1): 38. arXiv:2005.12854. Bibcode:2020AJ....160...38V. doi:10.3847/1538-3881/ab9642.
  5. "Lone Planetary-Mass Object Found in Family of Stars". NASA. 19 April 2016. Retrieved 21 April 2016.
  6. Kennell, Joanne. "Astronomers Spot a Lonely Planet-Like Object Floating Freely in Space". The Science Explorer. Retrieved 21 April 2016.
  7. 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. S2CID 119081444.
  8. 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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