Hatzes, Artie P., Fridlund, Malcolm, Nachmani, Gil, Mazeh, Tsevi, Valencia, Diana, Hebrard, Guillaume, Carone, Ludmila ORCID: 0000-0001-9355-3752, Paetzold, Martin, Udry, Stephane, Bouchy, Francois, Deleuil, Magali ORCID: 0000-0001-6036-0225, Moutou, Claire, Barge, Pierre, Borde, Pascal, Deeg, Hans ORCID: 0000-0003-0047-4241, Tingley, Brandon ORCID: 0000-0003-4483-2661, Dvorak, Rudolf, Gandolfi, Davide ORCID: 0000-0001-8627-9628, Ferraz-Mello, Sylvio, Wuchterl, Guenther, Guenther, Eike, Guillot, Tristan ORCID: 0000-0002-7188-8428, Rauer, Heike, Erikson, Anders, Cabrera, Juan ORCID: 0000-0001-6653-5487, Csizmadia, Szilard, Leger, Alain, Lammer, Helmut, Weingrill, Joerg, Queloz, Didier, Alonso, Roi ORCID: 0000-0001-8462-8126, Rouan, Daniel and Schneider, Jean (2011). THE MASS OF CoRoT-7b. Astrophys. J., 743 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

The mass of CoRoT-7b, the first transiting super-Earth exoplanet, is still a subject of debate. A wide range of masses have been reported in the literature ranging from as high as 8 M-circle plus to as low as 2.3 M-circle plus. This range in mass is largely due to the activity level of the star that contributes a significant amount of radial velocity (RV) jitter and how the various methods correct this jitter. Although most mass determinations give a density consistent with a rocky planet, the lower value permits a bulk composition that can be up to 50% water. We present an analysis of the CoRoT-7b RV measurements that uses very few and simple assumptions in treating the activity signal. By analyzing those RV data for which multiple measurements were made in a given night, we remove the activity related RV contribution without any a priori model. We argue that the contribution of activity to the final RV curve is negligible and that the K-amplitude due to the planet is well constrained. This yields a mass of 7.42 +/- 1.21 M-circle plus and a mean density of rho = 10.4 +/- 1.8 gm cm(-3). CoRoT-7b is similar in mass and radius to the second rocky planet to be discovered, Kepler-10b, and within the errors they have identical bulk densities-they are virtual twins. These bulk densities lie close to the density-radius relationship for terrestrial planets similar to what is seen for Mercury. CoRoT-7b and Kepler-10b may have an internal structure more like Mercury than the Earth.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Hatzes, Artie P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fridlund, MalcolmUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nachmani, GilUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mazeh, TseviUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Valencia, DianaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hebrard, GuillaumeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Carone, LudmilaUNSPECIFIEDorcid.org/0000-0001-9355-3752UNSPECIFIED
Paetzold, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Udry, StephaneUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bouchy, FrancoisUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deleuil, MagaliUNSPECIFIEDorcid.org/0000-0001-6036-0225UNSPECIFIED
Moutou, ClaireUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barge, PierreUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Borde, PascalUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deeg, HansUNSPECIFIEDorcid.org/0000-0003-0047-4241UNSPECIFIED
Tingley, BrandonUNSPECIFIEDorcid.org/0000-0003-4483-2661UNSPECIFIED
Dvorak, RudolfUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gandolfi, DavideUNSPECIFIEDorcid.org/0000-0001-8627-9628UNSPECIFIED
Ferraz-Mello, SylvioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wuchterl, GuentherUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guenther, EikeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guillot, TristanUNSPECIFIEDorcid.org/0000-0002-7188-8428UNSPECIFIED
Rauer, HeikeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erikson, AndersUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cabrera, JuanUNSPECIFIEDorcid.org/0000-0001-6653-5487UNSPECIFIED
Csizmadia, SzilardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leger, AlainUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lammer, HelmutUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Weingrill, JoergUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Queloz, DidierUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alonso, RoiUNSPECIFIEDorcid.org/0000-0001-8462-8126UNSPECIFIED
Rouan, DanielUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schneider, JeanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-483545
DOI: 10.1088/0004-637X/743/1/75
Journal or Publication Title: Astrophys. J.
Volume: 743
Number: 1
Date: 2011
Publisher: IOP PUBLISHING LTD
Place of Publication: BRISTOL
ISSN: 1538-4357
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
PLANETS; STAR; KEPLER-9; SYSTEMMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/48354

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