Cool Companions on Ultrawide Orbits

COCONUTS-2b

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]

## List of discoveries

Name  | companion class  | mass ([[Astronomy:Jupiter mass | J}}}}}}]])  | orbital separation (au)  | host star  | star class  | host star mass (M☉)  | discovery year  | reference

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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

* List of exoplanet search projects

## 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. https://ui.adsabs.harvard.edu/abs/2020AAS...23514806Z. Retrieved 2022-04-02.
2. ↑ Siegel, Ethan. "Astronomers Go Nuts For Closest Exoplanet Directly Imaged Ever: COCONUTS-2b" (in en). https://www.forbes.com/sites/startswithabang/2021/08/02/astronomers-go-nuts-for-closest-exoplanet-directly-imaged-ever-coconuts-2b/.
3. ↑ Kooser, Amanda. "Massive exoplanet 'Coconuts-2b' could help reveal the secrets of young gas giants" (in en). https://www.cnet.com/science/meet-coconuts-2b-an-exoplanet-with-six-times-the-mass-of-jupiter/.
4. ↑ Zhang, Zhoujian; Liu, Michael C.; Hermes, J. J.; Magnier, Eugene A.; Marley, Mark S.; Tremblay, Pier-Emmanuel; Tucker, Michael A.; Do, Aaron et al. (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 (2): 171. doi:10.3847/1538-4357/ab765c. ISSN 0004-637X. Bibcode: 2020ApJ...891..171Z.
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 (2): L11. doi:10.3847/2041-8213/ac1123. ISSN 0004-637X. Bibcode: 2021ApJ...916L..11Z.
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. Bibcode: 2022ApJ...935...15Z.

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