COCONUTS-2b

COCONUTS-2 b, or WISEPA J075108.79-763449.6, is a gas giant exoplanet that orbits the M-type star L 34-26. With a mass of 6.3 Jupiters, it takes over one million years to complete one orbit around the star, and it is 6000 AU away from it.[1]

COCONUTS-2b
Discovery
Discovered byZhoujian Zhang
Michael Liu
Zach Claytor
William Best
Trent Dupuy
Robert Siverd[1]
Discovery date2011
July 2021[2]
Direct imaging
Designations
WISEPA J075108.79-763449.6
Orbital characteristics
7,506.0 AU (1.12288×1012 km)[3]
1101369.9 years[3]
StarL 34-26
Physical characteristics
Mean radius
1.12±0.04 RJ[4]
Mass6.3 MJ[3]

    The planet was discovered in 2011 and was initially identified as a T9 free-floating brown dwarf WISEPA J075108.79−763449.6. During the COol Companions ON Ultrawide orbiTS (COCONUTS) survey, its association with L 34-26 was announced in 2021.[5] At a distance of 10.9 pc, COCONUTS-2b is the closest directly imaged exoplanet to Earth known to date.[6]

    Due to its large orbital separation, COCONUTS-2b is a great laboratory to study the atmosphere and composition of young gas-giant exoplanets.[2] Astronomers estimate the planet’s temperature to be around 434 K (161 Celsius, or 322 Fahrenheit).[7]

    Host star

    L 34-26, also known as COCONUTS-2A and TYC 9381-1809-1, is a M3-type dwarf star located 35 light-years away, in the constellation of Chamaeleon. The star is about one-third the mass of the Sun, with an age between 150 and 800 million years old.[8]

    References
    1. "Massive COCONUTS exoplanet discovery led by UH grad student | University of Hawaiʻi System News". University of Hawaiʻi News. University of Hawaiʻi at Mānoa. Retrieved 21 December 2021.
    2. Kooser, Amanda. "Massive exoplanet 'Coconuts-2b' could help reveal the secrets of young gas giants". CNET. Retrieved 21 December 2021.
    3. "COCONUTS-2 b". Exoplanet Exploration: Planets Beyond our Solar System. National Aeronautics and Space Administration. Retrieved 21 December 2021.
    4. "COCONUTS-2". Open Exoplanet Catalogue. Retrieved 21 December 2021.
    5. "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 2021-11-22.
    6. Siegel, Ethan. "Astronomers Go Nuts For Closest Exoplanet Directly Imaged Ever: COCONUTS-2b". Forbes. Retrieved 2021-11-22.
    7. Zhang, Zhoujian; Liu, Michael C.; Claytor, Zachary R.; Best, William M. J.; Dupuy, Trent J.; Siverd, Robert J. (2021-08-01). "The Second Discovery from the COCONUTS Program: A Cold Wide-orbit Exoplanet around a Young Field M Dwarf at 10.9 pc". The Astrophysical Journal. 916: L11. doi:10.3847/2041-8213/ac1123. ISSN 0004-637X.
    8. "Giant Exoplanet Orbits Its Host Star Once Every 1.1 Million Years | Astronomy | Sci-News.com". Breaking Science News | Sci-News.com. Retrieved 2021-11-22.
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