Transiting exoplanets from the CoRoT space mission. XXVI. CoRoT-24: a transiting multiplanet system
- Autor(en)
- Roi Alonso, Claire Moutou, Michael Endl, Rudolf Dvorak
- Abstrakt
We present the discovery of a candidate multiply transiting system, the first one found in the CoRoT mission. Two transit-like features with periods of 5.11 and 11.76 d are detected in the CoRoT light curve around a main sequence K1V star of r = 15.1. If the features are due to transiting planets around the same star, these would correspond to objects of 3.7 ± 0.4 and 5.0 ± 0.5 R, respectively. Several radial velocities serve to provide an upper limit of 5.7 M for the 5.11 d signal and to tentatively measure a mass of 28
+11
-11 M for the object transiting with a 11.76 d period. These measurements imply low density objects, with a significant gaseous envelope. The detailed analysis of the photometric and spectroscopic data serves to estimate the probability that the observations are caused by transiting Neptune-sized planets as much as over 26 times higher than a blend scenario involving only one transiting planet and as much as over 900 times higher than a scenario involving two blends and no planets. The radial velocities show a long-term modulation that might be attributed to a 1.5 M
Jup planet orbiting at 1.8 AU from the host, but more data are required to determine the precise orbital parameters of this companion.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Universität Genf, Université de Provence Aix-Marseille I, University of Texas, Austin
- Journal
- Astronomy & Astrophysics
- Band
- 567
- Anzahl der Seiten
- 13
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361/201118662
- Publikationsdatum
- 07-2014
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie, 103004 Astrophysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Astronomy and Astrophysics, Space and Planetary Science
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/0be4aa56-5403-400d-b57e-f897f9e58042