ROXs 42Bb explained

ROXs 42Bb
Discoverer:Currie et al.
Discovery Site:Keck Telescope, Very Large Telescope, Subaru Telescope
Discovered:October 17, 2013
Period:1968.3[1]
Apsis:astron
Star:ROXs 42B
Mean Radius:[2]
Surface Grav: g

ROXs 42Bb is a directly imaged planetary-mass companion[3] to the binary M star ROXs 42B,[4] a likely member of the Rho Ophiuchi cloud complex. The companion was announced/discovered on October 17, 2013, by University of Toronto astronomer Thayne Currie.

The object has an estimated mass around 9 Jupiter masses, depending on the age of the star, similar to the masses of directly imaged planets around HR 8799 and beta Pictoris. However, it is unclear whether ROXs 42Bb formed like these planets via core accretion, by disk (gravitational) instability, or more like a binary star. Preliminary fits of the spectra and broadband photometry to atmospheric models imply a radius of for an effective temperature of about 2,000 K or a radius of for about 1950 K. Like Beta Pictoris b, ROXs 42Bb's atmosphere is likely very cloudy and dusty.[5]

The object is located in the constellation Ophiuchus, near the border with Scorpius.

See also

Notes and References

  1. Web site: Exoplanet-catalog .
  2. Inglis . Julie . Wallack . Nicole L. . Xuan . Jerry W. . Knutson . Heather A. . Chachan . Yayaati . Bryan . Marta L. . Bowler . Brendan P. . Iyer . Aishwarya . Kataria . Tiffany . Benneke . Björn . 2024-05-01 . Atmospheric Retrievals of the Young Giant Planet ROXs 42B b from Low- and High-resolution Spectroscopy . 2024AJ....167..218I . The Astronomical Journal . 167 . 5 . 218 . 10.3847/1538-3881/ad2771 . free . 2402.09533 . 0004-6256.
  3. Direct Imaging and Spectroscopy of a Candidate Companion Below/Near the Deuterium-Burning Limit In The Young Binary Star System, ROXs 42B . Thayne . Currie . Sebastian . Daemgen . John . Debes . David . Lafreniere . Yoichi . Itoh . Ray . Jayawardhana . Thorsten . Ratzka . Serge . Correia . The Astrophysical Journal Letters. 2014ApJ...780L..30C. 10.1088/2041-8205/780/2/L30. 2014. 780. 2 . 30. 1310.4825 . 118464822 .
  4. Michael . Simon . A. M. . Ghez . Ch. . Leinert . L. . Cassar . W. P. . Chen . R. R. . Howell . R. F. . Jameson . K. . Matthews . G. . Neugebauer . A. . Richichi . The Astrophysical Journal . A lunar occultation and direct imaging survey of multiplicity in the Ophiuchus and Taurus star-forming regions. 1995ApJ...443..625S. 10.1086/175554. 1995. 443. 625 . 122944079 .
  5. A First-Look Atmospheric Modeling Study of the Young Directly-Imaged Planet-Mass Companion, ROXs 42Bb . Thayne . Currie . Adam . Burrows . Sebastian . Daemgen . 2014 . 1404.0131 . 10.1088/0004-637X/787/2/104 . 787 . 2 . The Astrophysical Journal . 104. 2014ApJ...787..104C . 118376549 .

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