Hebrard, G., Evans, T. M., Alonso, R., Fridlund, M., Ofir, A., Aigrain, S., Guillot, T., Almenara, J. M., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Borde, P., Bouchy, F., Cabrera, J., Carone, L., Carpano, S., Cavarroc, C., Csizmadia, Sz., Deeg, H. J., Deleuil, M., Diaz, R. F., Dvorak, R., Erikson, A., Ferraz-Mello, S., Gandolfi, D., Gibson, N., Gillon, M., Guenther, E., Hatzes, A., Havel, M., Jorda, L., Lammer, H., Leger, A., Llebaria, A., Mazeh, T., Moutou, C., Ollivier, M., Parviainen, H., Paetzold, M., Queloz, D., Rauer, H., Rouan, D., Santerne, A., Schneider, J., Tingley, B. and Wuchterl, G. (2011). Transiting exoplanets from the CoRoT space mission XVIII. CoRoT-18b: a massive hot Jupiter on a prograde, nearly aligned orbit. Astron. Astrophys., 533. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 0004-6361

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Abstract

We report the detection of CoRoT-18b, a massive hot Jupiter transiting in front of its host star with a period of 1.9000693 +/- 0.0000028 days. This planet was discovered thanks to photometric data secured with the CoRoT satellite combined with spectroscopic and photometric ground-based follow-up observations. The planet has a mass M-p = 3.47 +/- 0.38 M-Jup, a radius R-p = 1.31 +/- 0.18 R-Jup, and a density rho(p) = 2.2 +/- 0.8 g cm(-3). It orbits a G9V star with a mass M-* = 0.95 +/- 0.15 M-circle dot, a radius R-* = 1.00 +/- 0.13 R-circle dot, and a rotation period P-rot = 5.4 +/- 0.4 days. The age of the system remains uncertain, with stellar evolution models pointing either to a few tens Ma or several Ga, while gyrochronology and lithium abundance point towards ages of a few hundred Ma. This mismatch potentially points to a problem in our understanding of the evolution of young stars, with possibly significant implications for stellar physics and the interpretation of inferred sizes of exoplanets around young stars. We detected the RossiterMcLaughlin anomaly in the CoRoT-18 system thanks to the spectroscopic observation of a transit. We measured the obliquity psi = 20 degrees +/- 20 degrees +/- (sky-projected value lambda = -10 degrees +/- 20 degrees), indicating that the planet orbits in the same way as the star is rotating and that this prograde orbit is nearly aligned with the stellar equator.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Hebrard, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Evans, T. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alonso, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fridlund, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ofir, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aigrain, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guillot, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Almenara, J. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Auvergne, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baglin, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barge, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bonomo, A. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Borde, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bouchy, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cabrera, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Carone, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Carpano, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cavarroc, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csizmadia, Sz.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deeg, H. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deleuil, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Diaz, R. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dvorak, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erikson, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ferraz-Mello, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gandolfi, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gibson, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gillon, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guenther, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hatzes, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Havel, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jorda, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lammer, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leger, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Llebaria, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mazeh, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moutou, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ollivier, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Parviainen, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paetzold, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Queloz, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rauer, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rouan, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Santerne, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schneider, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tingley, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wuchterl, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-490146
DOI: 10.1051/0004-6361/201117192
Journal or Publication Title: Astron. Astrophys.
Volume: 533
Date: 2011
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 0004-6361
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
EXTRA-SOLAR PLANETS; LINE-DATA-BASE; LIGHT-CURVE; CORALIE SURVEY; GIANT PLANET; STAR; SYSTEMS; SPECTROSCOPY; PARAMETERS; ATMOSPHEREMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/49014

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