2011A&A...534A..67T

Query : 2011A&A...534A..67T

2011A&A...534A..67T - Astronomy and Astrophysics, volume 534A67-67 (2011/10-1)

CoRoT LRa02_E2_0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary.

TAL-OR L., SANTERNE A., MAZEH T., BOUCHY F., MOUTOU C., ALONSO R., GANDOLFI D., AIGRAIN S., AUVERGNE M., BARGE P., BONOMO A.S., BORDE P., DEEG H., FERRAZ-MELLO S., DELEUIL M., DVORAK R., ERIKSON A., FRIDLUND M., GILLON M., GUENTHER E.W., GUILLOT T., HATZES A., JORDA L., LAMMER H., LEGER A., LLEBARIA A., OLLIVIER M., PAETZOLD M., QUELOZ D., RAUER H., ROUAN D., TSODIKOVICH Y. and WUCHTERL G.

Abstract (from CDS):

This paper presents the case of CoRoT LRa02E20121, 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 ∼0.07%, indicating a diluted eclipsing binary. Combined MCMC modeling of the lightcurve and the radial velocities suggested that CoRoT LRa02E20121 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.

Abstract Copyright: ∼

Journal keyword(s): planetary systems - binaries: eclipsing - techniques: photometric - techniques: radial velocities

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * 30 Ari B PM* 02 36 57.7454168256 +24 38 53.000422908   7.59 7.09     F6V 157 1
2 * m Tau ** 05 07 27.0055682766 +18 38 42.179768546 5.79 5.65   4.5   G1V 316 0
3 2MASS J06520760-0526137 EB? 06 52 07.6023080808 -05 26 13.758426600   12.32 11.75     ~ 1 0
4 HD 181068 SB* 19 17 08.9786734416 +41 15 53.314415820   8.01 7.09     G8III+G8V+K1V 90 0
5 * tet Cyg PM* 19 36 26.5330717650 +50 13 15.965003998 4.83 4.86 4.48 4.13 3.92 F3+V 361 1
6 * 16 Cyg B PM* 19 41 51.9726777456 +50 31 03.089030916 7.07 6.86 6.20 5.76 5.42 G3V 949 1
7 * gam Cep SB* 23 39 20.9104133784 +77 37 56.510781384 5.190 4.250   2.6   K1III-IVCN1 626 1

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