Published February 2014
| Version v1
Journal article
Transiting exoplanets from the CoRoT space mission XXV. C0R0T-27b: a massive and dense planet on a short-period orbit
Creators
- Parviainen, H.
- Gandolfi, D.
- Deleuil, M.
- Moutou, C.
- Deeg, H. J.
- Ferraz-Mello, S.
- Samuel, B.
- Csizmadia, Sz.
- Pasternacki, T.
- Wuchterl, G.
- Havel, M.
- Fridlund, M.
- Angus, R.
- Tingley, B.
- Grziwa, S.
- Korth, J.
- Aigrain, S.
- Almenara, J. M.
- Alonso, R.
- Baglin, A.
- Barros, S. C. C.
- Borde, P.
- Bouchy, F.
- Cabrera, J.
- Diaz, R. F.
- Dvorak, R.
- Erikson, A.
- Guillot, T.
- Hatzes, A.
- Hébrard, G.
- Mazeh, T.
- Montagnier, G.
- Ofir, A.
- Ollivier, M.
- Paetzold, M.
- Rauer, H.
- Rouan, D.
- Santerne, A.
- Schneider, J.
Contributors
Others:
- Department of Brain and Behavioural Sciences ; Università degli Studi di Pavia = University of Pavia (UNIPV)
- Laboratoire d'Astrophysique de Marseille (LAM) ; Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)
- Institut d'Astrophysique de Paris (IAP) ; Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
- Instituto de Astronomia, Geofísica e Ciências Atmosféricas [São Paulo] (IAG) ; Universidade de São Paulo = University of São Paulo (USP)
- Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA) ; Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
- Thüringer Landessternwarte Tautenburg (TLS)
- Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides (CASSIOPEE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
- Research and Scientific Support Department, ESTEC (RSSD) ; European Space Research and Technology Centre (ESTEC) ; Agence Spatiale Européenne = European Space Agency (ESA)-Agence Spatiale Européenne = European Space Agency (ESA)
- Centro de Biología Molecular Severo Ochoa [Madrid] (CBMSO) ; Universidad Autónoma de Madrid (UAM)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)
- Observatoire de Haute-Provence (OHP) ; Institut Pythéas (OSU PYTHEAS) ; Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Centre National de la Recherche Scientifique (CNRS)
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN)
- Institute of Astronomy ; University of Vienna [Vienna]
- DLR Institute of Planetary Research ; German Aerospace Center (DLR)
- Joseph Louis LAGRANGE (LAGRANGE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
- European Southern Observatory (ESO)
- Laboratoire des technologies de la microélectronique (LTM) ; Université Joseph Fourier - Grenoble 1 (UJF)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
- Universität zu Köln = University of Cologne
- DLR Institut für Planetenforschung ; Deutsches Zentrum für Luft- und Raumfahrt [Berlin] (DLR)
- Centro de Astrofísica da Universidade do Porto (CAUP) ; Universidade do Porto = University of Porto
- Laboratoire Univers et Théories (LUTH (UMR_8102)) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
Description
Aims. We report the discovery of a massive and dense transiting planet CoRoT-27b on a 3.58-day orbit around a 4.2 Gyr-old G2 star. The planet candidate was identified from the CoRoT photometry, and was confirmed as a planet with ground-based spectroscopy. Methods. The confirmation of the planet candidate is based on radial velocity observations combined with imaging to rule out blends. The characterisation of the planet and its host star was carried out using a Bayesian approach where all the data (CoRoT photometry, radial velocities, and spectroscopic characterisation of the star) are used jointly. The Bayesian analysis included a study whether the assumption of white normally distributed noise holds for the CoRoT photometry and whether the use of a non-normal noise distribution offers advantages in parameter estimation and model selection. Results. CoRoT-27b has a mass of 10.39 +/- 0.55 M-Jup, a radius of 1.01 +/- 0.04 R-Jup, a mean density of 12.6(-1.67)(+1.92) g cm(-3), and an effective temperature of 1500 +/- 130 K. The planet orbits around its host star, a 4.2 Gyr-old G2-star with a mass M-star = 1.06 M-circle dot and a radius R-star = 1.05 R-circle dot, on a 0.048 +/- 0.007 AU orbit of 3.58 days. The radial velocity observations allow us to exclude highly eccentric orbits, namely, e \textless0.065 with 99% confidence. Given its high mass and density, theoretical modelling of CoRoT-27b is demanding. We identify two solutions with heavy element mass fractions of 0.11 +/- 0.08 M-circle plus, and 0.07 +/- 0.06 M-circle plus, but even solutions void of heavy elements cannot be excluded. We carry out a secondary eclipse search from the CoRoT photometry using a method based on Bayesian model selection, but conclude that the noise level is too high to detect eclipses shallower than 9% of the transit depth. Using a non-normal noise model was shown not to affect the parameter estimation results, but led to significant improvement in the sensitivity of the model selection process.
Abstract
International audienceAdditional details
Identifiers
- URL
- https://hal.science/hal-01442018
- URN
- urn:oai:HAL:hal-01442018v1
Origin repository
- Origin repository
- UNICA