2014/06/11 by R. Alonso, C. Moutou, M. Endl +60 · 1 citation
Physics and Astronomy · #Astro and Planetary Science #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph.EP
paper · pdf · doi:10.1051/0004-6361/201118662
published as A&A 567, A112 (2014) · 13 pages, 13 figures, accepted to A&A, minor typos corrected
openalex publication_date 2014/06/11 · arxiv created 2014/06/19 · arxiv updated 2014/09/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 <i>r<i/> = 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 <i>R<i/><sub>⊕<sub/> , respectively. Several radial velocities serve to provide an upper limit of 5.7 <i>M<i/><sub>⊕<sub/> for the 5.11 d signal and to tentatively measure a mass of 28<sup>+11<sup/><sub>-11<sub/> <i>M<i/><sub>⊕<sub/> 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 <i>M<i/><sub>Jup<sub/> planet orbiting at 1.8 AU from the host, but more data are required to determine the precise orbital parameters of this companion.