Cool Companions on Ultrawide Orbits

The COol Companions ON Ultrawide orbiTS (COCONUTS) program is a large-scale survey for wide-orbit planetary and substellar companions considered the first survey of this type of celestial bodies.[1] In 2021, the team announced COCONUTS-2b, the closest exoplanet directly imaged ever.[2] The program is a dedicated large-scale search for wide-orbit giant planets and brown dwarf companions, targeting a sample of 300,000 stars. By using multi-wavelength photometry and multi-epoch astrometry, astronomers are able to assess the candidates' companionship and ultracool nature.[3]

COCONUTS-2b

List of discoveries
Name companion class mass (MJ) orbital separation (au) host star star class host star mass (M☉) discovery year reference
COCONUTS-1B brown dwarf 15.4 or 69.3 1280 PSO J058.9855+45.4184 old white dwarf 0.548 2020 [4]
COCONUTS-2b exoplanet 6.3 6471 L 34-26 young M-dwarf 0.37 2021 [5]
COCONUTS-3B brown dwarf 39 1891 UCAC4 374-046899 young M-dwarf 0.123 2022 [6]

See also

References
  1. Zhang, Z.; Liu, M.; Magnier, E. (2020-01-01). "COCONUTS: COol Companions ON Ultrawide orbiTS". American Astronomical Society Meeting Abstracts #235. 235: 148.06. Bibcode:2020AAS...23514806Z. Archived from the original on 2022-04-02. Retrieved 2022-04-02.
  2. Siegel, Ethan. "Astronomers Go Nuts For Closest Exoplanet Directly Imaged Ever: COCONUTS-2b". Forbes. Archived from the original on 2021-11-22. Retrieved 2022-04-02.
  3. Kooser, Amanda. "Massive exoplanet 'Coconuts-2b' could help reveal the secrets of young gas giants". CNET. Archived from the original on 2022-04-02. Retrieved 2022-04-02.
  4. Zhang, Zhoujian; Liu, Michael C.; Hermes, J. J.; Magnier, Eugene A.; Marley, Mark S.; Tremblay, Pier-Emmanuel; Tucker, Michael A.; Do, Aaron; Payne, Anna V.; Shappee, Benjamin J. (2020-03-01). "COol Companions ON Ultrawide orbiTS (COCONUTS). I. A High-gravity T4 Benchmark around an Old White Dwarf and a Re-examination of the Surface-gravity Dependence of the L/T Transition". The Astrophysical Journal. 891: 171. arXiv:2002.05723. doi:10.3847/1538-4357/ab765c. ISSN 0004-637X.
  5. 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.
  6. Zhang, Zhoujian; Liu, Michael C.; Morley, Caroline V.; Magnier, Eugene A.; Tucker, Michael A.; Vanderbosch, Zachary P.; Do, Aaron; Shappee, Benjamin J. (2022-08-01). "COol Companions ON Ultrawide orbiTS (COCONUTS). III. A Very Red L6 Benchmark Brown Dwarf around a Young M5 Dwarf". The Astrophysical Journal. 935: 15. doi:10.3847/1538-4357/ac7ce9. ISSN 0004-637X.
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