Bibcode
Cabrera, J.; Csizmadia, Sz.; Montagnier, G.; Fridlund, M.; Ammler-von Eiff, M.; Chaintreuil, S.; Damiani, C.; Deleuil, M.; Ferraz-Mello, S.; Ferrigno, A.; Gandolfi, D.; Guillot, T.; Guenther, E. W.; Hatzes, A.; Hébrard, G.; Klagyivik, P.; Parviainen, H.; Pasternacki, Th.; Pätzold, M.; Sebastian, D.; Tadeu dos Santos, M.; Wuchterl, G.; Aigrain, S.; Alonso, R.; Almenara, J.-M.; Armstrong, J. D.; Auvergne, M.; Baglin, A.; Barge, P.; Barros, S. C. C.; Bonomo, A. S.; Bordé, P.; Bouchy, F.; Carpano, S.; Chaffey, C.; Deeg, H. J.; Díaz, R. F.; Dvorak, R.; Erikson, A.; Grziwa, S.; Korth, J.; Lammer, H.; Lindsay, C.; Mazeh, T.; Moutou, C.; Ofir, A.; Ollivier, M.; Pallé, E.; Rauer, H.; Rouan, D.; Samuel, B.; Santerne, A.; Schneider, J.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 579, id.A36, 19 pp.
Advertised on:
7
2015
Revista
Número de citas
16
Número de citas referidas
15
Descripción
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 ± 0.087
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.
The CoRoT space mission, launched on December 27th 2006, was developed
and is operated by CNES, with the contribution of Austria, Belgium,
Brazil, ESA (RSSD and Science Programme), Germany, and Spain. Based on
observations obtained with the Nordic Optical Telescope, operated on the
island of La Palma jointly by Denmark, Finland, Iceland, Norway, and
Sweden, in the Spanish Observatorio del Roque de los Muchachos of the
Instituto de Astrofisica de Canarias, in time allocated by OPTICON and
the Spanish Time Allocation Committee (CAT). The research leading to
these results has received funding from the European Community's Seventh
Framework Programme (FP7/2007-2013) under grant agreement number
RG226604 (OPTICON). This work makes use of observations from the LCOGT
network.Appendices are available in electronic form at http://www.aanda.org
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