Borde, P. J., Diaz, R. F., Creevey, O., Damiani, C., Deeg, H., Klagyiviki, P., Wuchterl, G., Gandolfi, D., Fridlund, M., Bouchy, F., Aigrain, S., Alonso, R., Almenara, J-M, Baglin, A., Barros, C. C., Bonomo, A. S., Cabrera, J., Csizmadia, Sz, Deleuil, M., Erikson, A., Ferraz-Mello, S., Guenther, E. W., Guillot, T., Grziwa, S., Hatzes, A., Hebrard, G., Mazeh, T., Ollivier, M., Parviainen, H., Paetzold, M., Rauer, H., Rouan, D., Santerne, A. and Schneider, J. (2020). Transiting exoplanets from the CoRoT space mission XXIX. The hot Jupiters CoRoT-30 b and CoRoT-31 b. Astron. Astrophys., 635. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Aims. We report the discovery as well as the orbital and physical characterizations of two new transiting giant exoplanets, CoRoT-30 b and CoRoT-31 b, with the CoRoT space telescope.Methods. We analyzed two complementary data sets: photometric transit light curves measured by CoRoT, and radial velocity curves measured by the HARPS spectrometer. To derive the absolute masses and radii of the planets, we modeled the stars from available magnitudes and spectra.Results. We find that CoRoT-30 b is a warm Jupiter on a close-to-circular 9.06-day orbit around a G3V star with a semi-major axis of about 0.08 AU. It has a radius of 1.01 0.08 R-J, a mass of 2.90 +/- 0.22 M-J, and therefore a mean density of 3.45 +/- 0.65 g cm(-3). The hot Jupiter CoRoT-31 b is on a close-to-circular 4.63-day orbit around a G2 IV star with a semi-major axis of about 0.05 AU. It has a radius of 1.46 +/- 0.30 R-J, a mass of 0.84 +/- 0.34 M-J, and therefore a mean density of 0.33 +/- 0.18 g cm(-3).Conclusions. Neither system seems to support the claim that stars hosting planets are more depleted in lithium. The radii of both planets are close to that of Jupiter, but they differ in mass; CoRoT-30 b is ten times denser than CoRoT-31 b. The core of CoRoT-30 b would weigh between 15 and 75 Earth masses, whereas relatively weak constraints favor no core for CoRoT-31 b. In terms of evolution, the characteristics of CoRoT-31 b appear to be compatible with the high-eccentricity migration scenario, which is not the case for CoRoT-30 b. The angular momentum of CoRoT-31 b is currently too low for the planet to evolve toward synchronization of its orbital revolution with stellar rotation, and the planet will slowly spiral-in while its host star becomes a red giant. CoRoT-30 b is not synchronized either: it looses angular momentum owing to stellar winds and is expected reach steady state in about 2 Gyr. CoRoT-30 and 31, as a pair, are a truly remarkable example of diversity in systems with hot Jupiters.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Borde, P. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Diaz, R. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Creevey, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Damiani, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deeg, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klagyiviki, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wuchterl, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gandolfi, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fridlund, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bouchy, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aigrain, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alonso, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Almenara, J-MUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baglin, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barros, C. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bonomo, A. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cabrera, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csizmadia, SzUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deleuil, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erikson, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ferraz-Mello, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guenther, E. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guillot, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grziwa, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hatzes, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hebrard, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mazeh, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ollivier, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Parviainen, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paetzold, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rauer, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rouan, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Santerne, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schneider, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-340259
DOI: 10.1051/0004-6361/201732393
Journal or Publication Title: Astron. Astrophys.
Volume: 635
Date: 2020
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
EXTRASOLAR PLANET VALIDATION; MODEL ATMOSPHERES; STARS; LITHIUM; CALIBRATION; PARAMETERS; DWARF; AGESMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/34025

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