Article (Scientific journals)
Transiting exoplanets from the CoRoT space mission - XIX. CoRoT-23b: a dense hot Jupiter on an eccentric orbit
Rouan, D.; Parviainen, H.; Moutou, C. et al.
2011In Astronomy and Astrophysics, 537, p. 54
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Keywords :
Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] We report the detection of CoRoT-23b, a hot Jupiter transiting in front of its host star with a period of 3.6314 \pm 0.0001 days. This planet was discovered thanks to photometric data secured with the CoRoT satellite, combined with spectroscopic radial velocity (RV) measurements. A photometric search for possible background eclipsing binaries conducted at CFHT and OGS concluded with a very low risk of false positives. The usual techniques of combining RV and transit data simultaneously were used to derive stellar and planetary parameters. The planet has a mass of Mp = 2.8 \pm 0.3 MJup, a radius of Rpl = 1.05 \pm 0.13 RJup, a density of \approx 3 g cm-3. RV data also clearly reveal a non zero eccentricity of e = 0.16 \pm 0.02. The planet orbits a mature G0 main sequence star of V =15.5 mag, with a mass M\star = 1.14 \pm 0.08 M\odot, a radius R\star = 1. 61 \pm 0.18 R\odot and quasi-solar abundances. The age of the system is evaluated to be 7 Gyr, not far from the transition to subgiant, in agreement with the rather large stellar radius. The two features of a significant eccentricity of the orbit and of a fairly high density are fairly uncommon for a hot Jupiter. The high density is, however, consistent with a model of contraction of a planet at this mass, given the age of the system. On the other hand, at such an age, circularization is expected to be completed. In fact, we show that for this planetary mass and orbital distance, any initial eccentricity should not totally vanish after 7 Gyr, as long as the tidal quality factor Qp is more than a few 105, a value that is the lower bound of the usually expected range. Even if Corot-23b features a density and an eccentricity that are atypical of a hot Jupiter, it is thus not an enigmatic object.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rouan, D.
Parviainen, H.
Moutou, C.
Deleuil, M.
Fridlund, M.
Ofir, A.
Havel, M.
Aigrain, S.
Alonso, R.
Auvergne, M.
Baglin, A.
Barge, P.
Bonomo, A.
Bordé, P.
Bouchy, F.
Cabrera, J.
Cavarroc, C.
Csizmadia, Szilard
Deeg, H.
Diaz, R. F.
Dvorak, R.
Erikson, A.
Ferraz-Mello, S.
Gandolfi, D.
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Guillot, T.
Hatzes, A.
Hébrard, G.
Jorda, L.
Léger, A.
Llebaria, A.
Lammer, H.
Lovis, C.
Mazeh, T.
Ollivier, M.
Pätzold, M.
Queloz, D.
Rauer, H.
Samuel, B.
Santerne, A.
Schneider, J.
Tingley, B.
Wuchterl, G.
More authors (33 more) Less
Language :
English
Title :
Transiting exoplanets from the CoRoT space mission - XIX. CoRoT-23b: a dense hot Jupiter on an eccentric orbit
Publication date :
01 December 2011
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
537
Pages :
54
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Astronomy & Astrophysics in press
Available on ORBi :
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