ROXs 42Bb - Misplaced Pages

Circumbinary planetary-mass object orbiting ROXs 42B

ROXs 42Bb
Discovery
ROXs 42B and its companion (small red object on the right) with VLT MUSE
Discovered by	Currie et al.
Discovery site	Keck Telescope, Very Large Telescope, Subaru Telescope
Discovery date	October 17, 2013
Detection method	Direct imaging
Orbital characteristics
Orbital period (sidereal)	1968.3 years
Star	ROXs 42B
Physical characteristics
Mean radius	2.10±0.35 `R`_J
Mass	13±5 `M`_J
Surface gravity	3.2 - 12.8 g
Temperature	2240±150 K

ROXs 42Bb is a directly imaged planetary-mass companion to the binary M star ROXs 42B, 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 2.43 ± 0.18 R_J for an effective temperature of about 2,000 K or a radius of 2.55 ± 0.20 R_J for about 1950 K. Like Beta Pictoris b, ROXs 42Bb's atmosphere is likely very cloudy and dusty.

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

References

^ Currie, Thayne; Daemgen, Sebastian; Debes, John; Lafreniere, David; Itoh, Yoichi; Jayawardhana, Ray; Ratzka, Thorsten; Correia, Serge (2014). "Direct Imaging and Spectroscopy of a Candidate Companion Below/Near the Deuterium-Burning Limit In The Young Binary Star System, ROXs 42B". The Astrophysical Journal Letters. 780 (2): 30. arXiv:1310.4825. Bibcode:2014ApJ...780L..30C. doi:10.1088/2041-8205/780/2/L30. S2CID 118464822.
"Exoplanet-catalog".
^ Xuan, Jerry W.; Hsu, Chih-Chun; Finnerty, Luke; Wang, Jason; Ruffio, Jean-Baptiste; Zhang, Yapeng; Knutson, Heather A.; Mawet, Dimitri; Mamajek, Eric E.; Inglis, Julie; Wallack, Nicole L.; Bryan, Marta L.; Blake, Geoffrey A.; Mollière, Paul; Hejazi, Neda (July 1, 2024). "Are These Planets or Brown Dwarfs? Broadly Solar Compositions from High-resolution Atmospheric Retrievals of ∼10–30 M Jup Companions". The Astrophysical Journal. 970 (1): 71. arXiv:2405.13128. Bibcode:2024ApJ...970...71X. doi:10.3847/1538-4357/ad4796. ISSN 0004-637X.
Simon, Michael; Ghez, A. M.; Leinert, Ch.; Cassar, L.; Chen, W. P.; Howell, R. R.; Jameson, R. F.; Matthews, K.; Neugebauer, G.; Richichi, A. (1995). "A lunar occultation and direct imaging survey of multiplicity in the Ophiuchus and Taurus star-forming regions" (PDF). The Astrophysical Journal. 443: 625. Bibcode:1995ApJ...443..625S. doi:10.1086/175554. S2CID 122944079.
^ Currie, Thayne; Burrows, Adam; Daemgen, Sebastian (2014). "A First-Look Atmospheric Modeling Study of the Young Directly-Imaged Planet-Mass Companion, ROXs 42Bb". The Astrophysical Journal. 787 (2): 104. arXiv:1404.0131. Bibcode:2014ApJ...787..104C. doi:10.1088/0004-637X/787/2/104. S2CID 118376549.

2013 in space

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Space probe launches

Space probes	LADEE (lunar orbiter; Sep 2013) Mars Orbiter Mission (Mars orbiter; Nov 2013) MAVEN (Mars orbiter; Nov 2013) Chang'e 3 / Yutu (mission to the Moon; Dec 2013)
Space observatories	IRIS (solar observation; Jun 2013) Hisaki (ultraviolet observation; Sep 2013) Gaia (astrometric observation; Dec 2013)