CoRoT-20c
{{short description|Exoplanet}}
{{Infobox planet
| name = CoRoT-20c
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| discoverer = HARPS
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| discovered =
| discovery_method = Radial velocity
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| minorplanet = no
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| apsis = astron
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| semimajor = {{convert|2.9|AU|km|abbr=on}}{{cite web
|url=https://exoplanet.eu/catalog/corot_20_c--6782/
|work=Extrasolar Planets Encyclopaedia
|title=Notes on CoRoT-20 c
|access-date=February 25, 2019}}
| mean_orbit_radius =
| eccentricity = 0.6
| period = 1675 d
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| star = {{ill|CoRoT-20|ru}}
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| mass = above 17 {{Jupiter mass|link=y}}
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}}
CoRoT-20c is a brown dwarf-massed substellar companion found by the HARPS radial-velocity search terrestrial telescope. It orbits CoRoT-20, a G2V star in the constellation of Monoceros. It has an effective temperature of {{convert|5880|K|C F}}, a mass of 1.14 {{Solar mass|link=y}}, a radius of 0.92 {{Solar radius|link=y}}, and an above-solar metallicity. This is a young planet, with an estimated age between 0.06 and 0.14 Gyr.{{cite journal
|title=A 4.6-year period brown-dwarf companion interacting with the hot-Jupiter CoRoT-20 b
|doi=10.1051/0004-6361/201833180
|arxiv=1807.01229
|last1=Rey
|first1=J.
|last2=Bouchy
|first2=F.
|last3=Stalport
|first3=M.
|last4=Deleuil
|first4=M.
|last5=Hébrard
|first5=G.
|last6=Almenara
|first6=J. M.
|last7=Alonso
|first7=R.
|last8=Barros
|first8=S. C. C.
|last9=Bonomo
|first9=A.
|last10=Cazalet
|first10=G.
|last11=Delisle
|first11=J. B.
|last12=Díaz
|first12=R. F.
|last13=Fridlund
|first13=M.
|last14=Guenther
|first14=E. W.
|last15=Guillot
|first15=T.
|last16=Montagnier
|first16=G.
|last17=Moutou
|first17=C.
|last18=Lovis
|first18=C.
|last19=Queloz
|first19=D.
|last20=Santerne
|first20=A.
|last21=Udry
|first21=S.
|journal=Astronomy & Astrophysics
|year=2018
|volume=A115
|pages=619
|s2cid=126274116
}}