View source for ROXs 42Bb

{{Short description|Circumbinary planetary-mass object orbiting ROXs 42B}}
{{Use Canadian English|date=March 2023}}
{{Use mdy dates|date=March 2023}}
{{Infobox planet
| name                     = ROXs 42Bb 
| image = File:ROXs 42B MUSE IR.jpg
| image_scale = 
| caption = ROXs 42B and its companion (small red object on the right) with VLT [[Multi-unit spectroscopic explorer|MUSE]]
<!-- DISCOVERY           -->
| discoverer               = Currie et al.<ref name="Currie2013"/>
| discovery_site           = [[Keck Telescope]], [[Very Large Telescope]], [[Subaru Telescope]]
| discovered               = October 17, 2013
| discovery_method         = [[Direct imaging]]
<!-- DESIGNATIONS        -->
<!-- ORBITAL             --> 
| period                   = 1968.3<ref>{{cite web | url=https://exoplanets.nasa.gov/exoplanet-catalog/7139/roxs-42-b-b/ | title=Exoplanet-catalog }}</ref>
| apsis                    = astron
| star                     = ROXs 42B
<!-- PHYS CHARS          --> 
| mean_radius              = {{val|2.83|0.01}}<ref name=inglis>{{Cite journal |last1=Inglis |first1=Julie |last2=Wallack |first2=Nicole L. |last3=Xuan |first3=Jerry W. |last4=Knutson |first4=Heather A. |last5=Chachan |first5=Yayaati |last6=Bryan |first6=Marta L. |last7=Bowler |first7=Brendan P. |last8=Iyer |first8=Aishwarya |last9=Kataria |first9=Tiffany |last10=Benneke |first10=Björn |date=2024-05-01 |title=Atmospheric Retrievals of the Young Giant Planet ROXs 42B b from Low- and High-resolution Spectroscopy |bibcode=2024AJ....167..218I |journal=The Astronomical Journal |volume=167 |issue=5 |pages=218 |doi=10.3847/1538-3881/ad2771 |doi-access=free |arxiv=2402.09533 |issn=0004-6256}}</ref>
 {{Jupiter radius|link=y}}
| mass                     = {{val|4.1|0.9}}<ref name=inglis/> {{Jupiter mass|link=y}}
| surface_grav             = {{val|2.94|0.05}}<ref name=inglis/> [[Earth gravity|g]]
| single_temperature       = 1,935{{+-|12}}<ref name=inglis/> [[Kelvin|K]]
<!-- ATMOSPHERE          --> 
<!-- NOTES               --> 
}}
'''ROXs 42Bb''' is a directly imaged [[planet]]ary-mass companion<ref name="Currie2013">{{Cite journal |title=Direct Imaging and Spectroscopy of a Candidate Companion Below/Near the Deuterium-Burning Limit In The Young Binary Star System, ROXs 42B  |first1=Thayne |last1=Currie | first2 = Sebastian | last2 = Daemgen | first3 = John | last3 = Debes | first4 = David | last4 = Lafreniere | first5 = Yoichi | last5 = Itoh | first6 = Ray | last6 = Jayawardhana | first7 = Thorsten | last7 = Ratzka | first8 = Serge | last8 = Correia  |journal = The Astrophysical Journal Letters|bibcode = 2014ApJ...780L..30C|doi = 10.1088/2041-8205/780/2/L30|year=2014|volume=780|issue=2 |pages=30|arxiv= 1310.4825 |s2cid=118464822 }}</ref> to the binary M star ROXs 42B,<ref name="Simon1995">{{Cite journal| first1=Michael | last1=Simon | first2=A. M. | last2 = Ghez | first3=Ch. | last3 = Leinert | first4=L. | last4 = Cassar | first5=W. P. | last5 = Chen | first6=R. R. | last6 = Howell | first7=R. F. | last7 = Jameson | first8=K. | last8 = Matthews | first9=G. | last9 = Neugebauer | first10=A. | last10 = Richichi |journal = The Astrophysical Journal | title=A lunar occultation and direct imaging survey of multiplicity in the Ophiuchus and Taurus star-forming regions|bibcode = 1995ApJ...443..625S|doi = 10.1086/175554|year=1995|volume=443|pages=625 | s2cid=122944079 | url=https://authors.library.caltech.edu/84585/1/1995ApJ___443__625S.pdf }}</ref> 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,<ref name="Currie2013" /> 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 {{jupiter radius|2.43 ± 0.18}} for an effective temperature of about 2,000 K or a radius of {{jupiter radius|2.55 ± 0.20}} for about 1950 K.<ref name = "Currie2014"/>  Like [[Beta Pictoris b]], ROXs 42Bb's atmosphere is likely very cloudy and dusty.<ref name="Currie2014">{{Cite journal |title=A First-Look Atmospheric Modeling Study of the Young Directly-Imaged Planet-Mass Companion, ROXs 42Bb |first1=Thayne |last1=Currie | first2 = Adam | last2 = Burrows | first3 = Sebastian | last3 = Daemgen |year=2014 |arxiv= 1404.0131 | doi=10.1088/0004-637X/787/2/104 | volume=787 |issue=2 | journal=The Astrophysical Journal | page=104|bibcode = 2014ApJ...787..104C |s2cid=118376549 }}</ref>

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

==See also==
* [[List of largest exoplanets]]

==References==
{{reflist}}

{{2013 in space}}

[[Category:Exoplanets discovered in 2013]]
[[Category:Exoplanets detected by direct imaging]]
[[Category:Circumbinary planets]]
[[Category:Ophiuchus]]


{{Extrasolar-planet-stub}}