期刊
ASTRONOMY & ASTROPHYSICS
卷 534, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201117374
关键词
planetary systems; binaries: eclipsing; techniques: photometric; techniques: radial velocities
资金
- Israel Science Foundation [655/07]
- CNRS/INSU, France
- French National Research Agency [ANR-08-JCJC-0102-01]
- DLR [50OW204, 50OW603]
- UK Space Agency [ST/G002266/2] Funding Source: researchfish
- Agence Nationale de la Recherche (ANR) [ANR-08-JCJC-0102] Funding Source: Agence Nationale de la Recherche (ANR)
This paper presents the case of CoRoT LRa02_E2_0121, which was initially classified as a Neptune-size transiting-planet candidate on a relatively wide orbit of 36.3 days. Follow-up observations were performed with UVES, Sandiford, SOPHIE, and HARPS. These observations revealed a faint companion in the spectra. To find the true nature of the system we derived the radial velocities of the faint companion using TODMOR - a two-dimensional correlation technique, applied to the SOPHIE spectra. Modeling the lightcurve with EBAS we discovered a secondary eclipse with a depth of similar to 0.07%, indicating a diluted eclipsing binary. Combined MCMC modeling of the lightcurve and the radial velocities suggested that CoRoT LRa02_E2_0121 is a hierarchical triple system with an evolved G-type primary and an A-type: F-type grazing eclipsing binary. Such triple systems are difficult to discover.
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