CoRoT-22 b: a validated 4.9 R-circle plus exoplanet in 10-d orbit

C. Moutou (1) , J. M. Almenara (1) , R. F. Diaz , R. Alonso (2) , M. Deleuil (1) , E. Guenther , T. Pasternacki , S. Aigrain , A. Baglin (3) , P. Barge (1) , A. S. Bonomo , P. Borde , F. Bouchy (4, 5) , Justo Cabrera (6) , S. Carpano , W. D. Cochran , Sz Csizmadia , H. J. Deeg (5) , R. Dvorak (7) , M. Endl , A. Erikson (8) , S. Ferraz-Mello (9) , M. Fridlund (10) , D. Gandolfi (11) , T. Guillot (12) , A. Hatzes (13) , G. Hébrard (5) , C. Lovis (14) , H. Lammer (15) , P. J. Macqueen , T. Mazeh , A. Ofir , M. Ollivier (16) , M. Paetzold (17) , H. Rauer (18) , D. Rouan (3) , A. Santerne (19) , J. Schneider (20) , B. Tingley , G. Wuchterl (13)

1 LAM - Laboratoire d'Astrophysique de Marseille
2 CBMSO - Centro de Biología Molecular Severo Ochoa [Madrid]
3 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
4 OHP - Observatoire de Haute-Provence
5 IAP - Institut d'Astrophysique de Paris
6 IRSN - Institut de Radioprotection et de Sûreté Nucléaire
7 Institute of Astronomy
8 DLR Institute of Planetary Research
9 IAG - Instituto de Astronomia, Geofísica e Ciências Atmosféricas [São Paulo]
10 RSSD - Research and Scientific Support Department, ESTEC
11 Department of Brain and Behavioural Sciences
12 LAGRANGE - Joseph Louis LAGRANGE
13 TLS - Thüringer Landessternwarte Tautenburg
14 ObsGE - Observatoire Astronomique de l'Université de Genève
15 IWF - Space Research Institute of Austrian Academy of Sciences
16 LTM - Laboratoire des technologies de la microélectronique
17 Universität zu Köln = University of Cologne
18 DLR Institut für Planetenforschung
19 CAUP - Centro de Astrofísica da Universidade do Porto
20 LUTH (UMR_8102) - Laboratoire Univers et Théories

The CoRoT satellite has provided high-precision photometric light curves for more than 163 000 stars and found several hundreds of transiting systems compatible with a planetary scenario. If ground-based velocimetric observations are the best way to identify the actual planets among many possible configurations of eclipsing binary systems, recent transit surveys have shown that it is not always within reach of the radial-velocity detection limits. In this paper, we present a transiting exoplanet candidate discovered by CoRoT whose nature cannot be established from ground-based observations, and where extensive analyses are used to validate the planet scenario. They are based on observing constraints from radial-velocity spectroscopy, adaptive optics imaging and the CoRoT transit shape, as well as from priors on stellar populations, planet and multiple stellar systems frequency. We use the fully Bayesian approach developed in the PASTIS (Planet Analysis and Small Transit Investigation Software) analysis software, and conclude that the planet scenario is at least 1400 times more probable than any other false-positive scenario. The primary star is a metallic solar-like dwarf, with M-s = 1.099 +/- 0.049 M-circle dot and R-s = 1.136(-0.090)(+0.038) R-circle dot. The validated planet has a radius of R-p = 4.88(-0.39)(+0.17) R-circle plus and mass less than 49 M-circle plus. Its mean density is smaller than 2.56 g cm(-3) and orbital period is 9.7566 +/- 0.0012 d. This object, called CoRoT-22 b, adds to a large number of validated Kepler planets. These planets do not have a proper measurement of the mass but allow statistical characterization of exoplanets population.

Domaines: Astrophysique [astro-ph]

C. Moutou, J. M. Almenara, R. F. Diaz, R. Alonso, M. Deleuil, et al.. CoRoT-22 b: a validated 4.9 R-circle plus exoplanet in 10-d orbit. Monthly Notices of the Royal Astronomical Society, 2014, 444 (3), pp.2783--2792. ⟨10.1093/mnras/stu1645⟩. ⟨hal-01442017⟩