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Transiting exoplanets from the CoRoT space mission : XXVII. CoRoT-28b, a planet orbiting an evolved star, and CoRoT-29b, a planet showing an asymmetric transit

Cabrera, J. ; Csizmadia, Sz ; Montagnier, G. ; Fridlund, M. ; Ammler-Von Eiff, M. ; Chaintreuil, S. ; Damiani, C. ; Deleuil, M. ; Ferraz-Mello, S. and Ferrigno, A. , et al. (2015) In Astronomy and Astrophysics 579.
Abstract

Context. We present the discovery of two transiting extrasolar planets by the satellite CoRoT. Aims. We aim at a characterization of the planetary bulk parameters, which allow us to further investigate the formation and evolution of the planetary systems and the main properties of the host stars. Methods. We used the transit light curve to characterize the planetary parameters relative to the stellar parameters. The analysis of HARPS spectra established the planetary nature of the detections, providing their masses. Further photometric and spectroscopic ground-based observations provided stellar parameters (log g, Teff, vsini) to characterize the host stars. Our model takes the geometry of the transit to constrain the stellar... (More)

Context. We present the discovery of two transiting extrasolar planets by the satellite CoRoT. Aims. We aim at a characterization of the planetary bulk parameters, which allow us to further investigate the formation and evolution of the planetary systems and the main properties of the host stars. Methods. We used the transit light curve to characterize the planetary parameters relative to the stellar parameters. The analysis of HARPS spectra established the planetary nature of the detections, providing their masses. Further photometric and spectroscopic ground-based observations provided stellar parameters (log g, Teff, vsini) to characterize the host stars. Our model takes the geometry of the transit to constrain the stellar density into account, which when linked to stellar evolutionary models, determines the bulk parameters of the star. Because of the asymmetric shape of the light curve of one of the planets, we had to include the possibility in our model that the stellar surface was not strictly spherical. Results. We present the planetary parameters of CoRoT-28b, a Jupiter-sized planet (mass 0.484 ± 0.087 MJup; radius 0.955 ± 0.066 RJup) orbiting an evolved star with an orbital period of 5.208 51 ± 0.000 38 days, and CoRoT-29b, another Jupiter-sized planet (mass 0.85 ± 0.20 MJup; radius 0.90 ± 0.16 RJup) orbiting an oblate star with an orbital period of 2.850 570 ± 0.000 006 days. The reason behind the asymmetry of the transit shape is not understood at this point. Conclusions. These two new planetary systems have very interesting properties and deserve further study, particularly in the case of the star CoRoT-29.

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publishing date
type
Contribution to journal
publication status
published
keywords
Planetary systems, Techniques: photometric, Techniques: radial velocities, Techniques: spectroscopic
in
Astronomy and Astrophysics
volume
579
article number
A36
publisher
EDP Sciences
external identifiers
  • scopus:84933557322
ISSN
0004-6361
DOI
10.1051/0004-6361/201424501
language
English
LU publication?
no
additional info
Publisher Copyright: © ESO, 2015.
id
4b6d61be-9cb1-4670-99ac-e551cf9c5b15
date added to LUP
2023-02-03 09:40:59
date last changed
2023-02-28 15:45:00
@article{4b6d61be-9cb1-4670-99ac-e551cf9c5b15,
  abstract     = {{<p>Context. We present the discovery of two transiting extrasolar planets by the satellite CoRoT. Aims. We aim at a characterization of the planetary bulk parameters, which allow us to further investigate the formation and evolution of the planetary systems and the main properties of the host stars. Methods. We used the transit light curve to characterize the planetary parameters relative to the stellar parameters. The analysis of HARPS spectra established the planetary nature of the detections, providing their masses. Further photometric and spectroscopic ground-based observations provided stellar parameters (log g, T<sub>eff</sub>, vsini) to characterize the host stars. Our model takes the geometry of the transit to constrain the stellar density into account, which when linked to stellar evolutionary models, determines the bulk parameters of the star. Because of the asymmetric shape of the light curve of one of the planets, we had to include the possibility in our model that the stellar surface was not strictly spherical. Results. We present the planetary parameters of CoRoT-28b, a Jupiter-sized planet (mass 0.484 ± 0.087 M<sub>Jup</sub>; radius 0.955 ± 0.066 R<sub>Jup</sub>) orbiting an evolved star with an orbital period of 5.208 51 ± 0.000 38 days, and CoRoT-29b, another Jupiter-sized planet (mass 0.85 ± 0.20 M<sub>Jup</sub>; radius 0.90 ± 0.16 R<sub>Jup</sub>) orbiting an oblate star with an orbital period of 2.850 570 ± 0.000 006 days. The reason behind the asymmetry of the transit shape is not understood at this point. Conclusions. These two new planetary systems have very interesting properties and deserve further study, particularly in the case of the star CoRoT-29.</p>}},
  author       = {{Cabrera, J. and Csizmadia, Sz and Montagnier, G. and Fridlund, M. and Ammler-Von Eiff, M. and Chaintreuil, S. and Damiani, C. and Deleuil, M. and Ferraz-Mello, S. and Ferrigno, A. and Gandolfi, D. and Guillot, T. and Guenther, E. W. and Hatzes, A. and Hébrard, G. and Klagyivik, P. and Parviainen, H. and Pasternacki, Th and Pätzold, M. and Sebastian, D. and Tadeu Dos Santos, M. and Wuchterl, G. and Aigrain, S. and Alonso, R. and Almenara, J. M. and Armstrong, J. D. and Auvergne, M. and Baglin, A. and Barge, P. and Barros, S. C.C. and Bonomo, A. S. and Bordé, P. and Bouchy, F. and Carpano, S. and Chaffey, C. and Deeg, H. J. and Díaz, R. F. and Dvorak, R. and Erikson, A. and Grziwa, S. and Korth, J. and Lammer, H. and Lindsay, C. and Mazeh, T. and Moutou, C. and Ofir, A. and Ollivier, M. and Pallé, E. and Rauer, H. and Rouan, D. and Samuel, B. and Santerne, A. and Schneider, J.}},
  issn         = {{0004-6361}},
  keywords     = {{Planetary systems; Techniques: photometric; Techniques: radial velocities; Techniques: spectroscopic}},
  language     = {{eng}},
  month        = {{07}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{Transiting exoplanets from the CoRoT space mission : XXVII. CoRoT-28b, a planet orbiting an evolved star, and CoRoT-29b, a planet showing an asymmetric transit}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/201424501}},
  doi          = {{10.1051/0004-6361/201424501}},
  volume       = {{579}},
  year         = {{2015}},
}