Cool Companions on Ultrawide Orbits explained

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 !orbital separation (au)!host star!star class!host star mass !discovery year!reference
COCONUTS-1Bbrown dwarf15.4 or 69.31280PSO J058.9855+45.4184old white dwarf0.5482020[4]
COCONUTS-2bexoplanet6.36471L 34-26young M-dwarf0.372021[5]
COCONUTS-3Bbrown dwarf391891UCAC4 374-046899young M-dwarf0.1232022[6]

See also

Notes and References

  1. Zhang . Z. . Liu . M. . Magnier . E. . 2020-01-01 . COCONUTS: COol Companions ON Ultrawide orbiTS . 235 . 148.06 . American Astronomical Society Meeting Abstracts #235. 2020AAS...23514806Z . 2022-04-02 . 2022-04-02 . https://web.archive.org/web/20220402162302/https://ui.adsabs.harvard.edu/abs/2020AAS...23514806Z . live .
  2. Web site: Siegel . Ethan . Astronomers Go Nuts For Closest Exoplanet Directly Imaged Ever: COCONUTS-2b . 2022-04-02 . Forbes . en . 2021-11-22 . https://web.archive.org/web/20211122022619/https://www.forbes.com/sites/startswithabang/2021/08/02/astronomers-go-nuts-for-closest-exoplanet-directly-imaged-ever-coconuts-2b/ . live .
  3. Web site: Kooser . Amanda . Massive exoplanet 'Coconuts-2b' could help reveal the secrets of young gas giants . 2022-04-02 . CNET . en . 2022-04-02 . https://web.archive.org/web/20220402162302/https://www.cnet.com/science/meet-coconuts-2b-an-exoplanet-with-six-times-the-mass-of-jupiter/ . live .
  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 . 2 . 171 . 10.3847/1538-4357/ab765c . 0004-637X. 2002.05723 . 2020ApJ...891..171Z . free .
  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 . 10.3847/2041-8213/ac1123 . 2021ApJ...916L..11Z . 0004-637X. free . 2107.02805 .
  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 . 10.3847/1538-4357/ac7ce9 . 2022ApJ...935...15Z . 0004-637X. free . 2207.02865 .

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