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Transiting exoplanets from the CoRoT space mission XXVIII. CoRoT-28b, a planet orbiting an evolved star, and CoRoT-29b, a planet showing an asymmetric transit | J. Cabrera
; Sz. Csizmadia
; G. Montagnier
; M. Fridlund
; M. Ammler-von Eiff
; S. Chaintreuil
; C. Damiani
; M. Deleuil
; S. Ferraz-Mello
; A. Ferrigno
; D. Gandolfi
; T. Guillot
; E. W. Guenther
; A. Hatzes
; G. Hébrard
; P. Klagyivik
; H. Parviainen
; Th. Pasternacki
; M. Pätzold
; D. Sebastian
; M. Tadeu dos Santos
; G. Wuchterl
; S. Aigrain
; R. Alonso
; J.-M. Almenara
; J.D. Armstrong
; M. Auvergne
; A. Baglin
; P. Barge
; S. C. C. Barros
; A. S. Bonomo
; P. Bordé
; F. Bouchy
; S. Carpano
; C. Chaffey
; H. J. Deeg
; R. F. Díaz
; R. Dvorak
; A. Erikson
; S. Grziwa
; J. Korth
; H. Lammer
; C. Lindsay
; T. Mazeh
; C. Moutou
; A. Ofir
; M. Ollivier
; E. Pallé
; H. Rauer
; D. Rouan
; B. Samuel
; A. Santerne
; J. Schneider
; | Date: |
7 Apr 2015 | 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,v sin i) 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+/-0.087MJup; radius 0.955+/-0.066RJup)
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 +/- 0.20MJup; radius
0.90 +/- 0.16RJup) 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. | Source: | arXiv, 1504.1532 | Services: | Forum | Review | PDF | Favorites |
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