CoRoT LRa02-E2-0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary

L. Tal-Or; A. Santerne; T. Mazeh; F. Bouchy; C. Moutou; R. Alonso; D. Gandolfi; S. Aigrain; M. Auvergne; P. Barge; A. S. Bonomo; P. Bordé; H. Deeg; S. Ferraz-Mello; M. Deleuil; R. Dvorak; A. Erikson; M. Fridlund; M. Gillon; E. W. Guenther; T. Guillot; A. Hatzes; L. Jorda; H. Lammer; A. Léger; A. Llebaria; M. Ollivier; M. Pätzold; D. Queloz; H. Rauer; D. Rouan; Y. Tsodikovich; G. Wuchterl

doi:10.1051/0004-6361/201117374

CoRoT LRa02-E2-0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary

L. Tal-Or
, A. Santerne
, T. Mazeh
, F. Bouchy
, C. Moutou
, R. Alonso
, D. Gandolfi
, S. Aigrain
, M. Auvergne
, P. Barge
, A. S. Bonomo
, P. Bordé
, H. Deeg
, S. Ferraz-Mello
, M. Deleuil
, R. Dvorak
, A. Erikson
, M. Fridlund
, M. Gillon
, E. W. Guenther

T. Guillot, A. Hatzes, L. Jorda, H. Lammer, A. Léger, A. Llebaria, M. Ollivier, M. Pätzold, D. Queloz, H. Rauer, D. Rouan, Y. Tsodikovich, G. Wuchterl

Tel Aviv University

Research output: Contribution to journal › Article › peer-review

Abstract

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∼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.

Original language	English
Article number	A67
Journal	Astronomy and Astrophysics
Volume	534
DOIs	https://doi.org/10.1051/0004-6361/201117374
State	Published - 11 Oct 2011

Keywords

binaries
eclipsing
photometric
planetary systems
radial velocities
techniques

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361/201117374

Cite this

Tal-Or, L., Santerne, A., Mazeh, T., Bouchy, F., Moutou, C., Alonso, R., Gandolfi, D., Aigrain, S., Auvergne, M., Barge, P., Bonomo, A. S., Bordé, P., Deeg, H., Ferraz-Mello, S., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gillon, M., ... Wuchterl, G. (2011). CoRoT LRa02-E2-0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary. Astronomy and Astrophysics, 534, Article A67. https://doi.org/10.1051/0004-6361/201117374

@article{781a8650faf1489ca647e6dd72fb3308,

title = "CoRoT LRa02-E2-0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary",

abstract = "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∼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.",

keywords = "binaries, eclipsing, photometric, planetary systems, radial velocities, techniques",

author = "L. Tal-Or and A. Santerne and T. Mazeh and F. Bouchy and C. Moutou and R. Alonso and D. Gandolfi and S. Aigrain and M. Auvergne and P. Barge and Bonomo, \{A. S.\} and P. Bord{\'e} and H. Deeg and S. Ferraz-Mello and M. Deleuil and R. Dvorak and A. Erikson and M. Fridlund and M. Gillon and Guenther, \{E. W.\} and T. Guillot and A. Hatzes and L. Jorda and H. Lammer and A. L{\'e}ger and A. Llebaria and M. Ollivier and M. P{\"a}tzold and D. Queloz and H. Rauer and D. Rouan and Y. Tsodikovich and G. Wuchterl",

note = "Funding Information: We thank Gil Sokol, Gil Nachmani, and Simchon Faigler for their help with the lightcurve analysis. This research was supported by the Israel Science Foundation (grant No. 655/07). Financial support for the SOPHIE observations from the “Programme National de Plan{\'e}tologie” (PNP) of CNRS/INSU, France is gratefully acknowledged. We also acknowledge support from the French National Research Agency (ANR-08-JCJC-0102-01). The German CoRoT Team acknowledges the support of DLR grants 50OW204 and 50OW603. We thank the anonymous referee for fruitful comments and suggestions.",

year = "2011",

month = oct,

day = "11",

doi = "10.1051/0004-6361/201117374",

language = "English",

volume = "534",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Tal-Or, L, Santerne, A, Mazeh, T, Bouchy, F, Moutou, C, Alonso, R, Gandolfi, D, Aigrain, S, Auvergne, M, Barge, P, Bonomo, AS, Bordé, P, Deeg, H, Ferraz-Mello, S, Deleuil, M, Dvorak, R, Erikson, A, Fridlund, M, Gillon, M, Guenther, EW, Guillot, T, Hatzes, A, Jorda, L, Lammer, H, Léger, A, Llebaria, A, Ollivier, M, Pätzold, M, Queloz, D, Rauer, H, Rouan, D, Tsodikovich, Y & Wuchterl, G 2011, 'CoRoT LRa02-E2-0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary', Astronomy and Astrophysics, vol. 534, A67. https://doi.org/10.1051/0004-6361/201117374

TY - JOUR

T1 - CoRoT LRa02-E2-0121

T2 - Neptune-size planet candidate turns into a hierarchical triple system with a giant primary

AU - Tal-Or, L.

AU - Santerne, A.

AU - Mazeh, T.

AU - Bouchy, F.

AU - Moutou, C.

AU - Alonso, R.

AU - Gandolfi, D.

AU - Aigrain, S.

AU - Auvergne, M.

AU - Barge, P.

AU - Bonomo, A. S.

AU - Bordé, P.

AU - Deeg, H.

AU - Ferraz-Mello, S.

AU - Deleuil, M.

AU - Dvorak, R.

AU - Erikson, A.

AU - Fridlund, M.

AU - Gillon, M.

AU - Guenther, E. W.

AU - Guillot, T.

AU - Hatzes, A.

AU - Jorda, L.

AU - Lammer, H.

AU - Léger, A.

AU - Llebaria, A.

AU - Ollivier, M.

AU - Pätzold, M.

AU - Queloz, D.

AU - Rauer, H.

AU - Rouan, D.

AU - Tsodikovich, Y.

AU - Wuchterl, G.

N1 - Funding Information: We thank Gil Sokol, Gil Nachmani, and Simchon Faigler for their help with the lightcurve analysis. This research was supported by the Israel Science Foundation (grant No. 655/07). Financial support for the SOPHIE observations from the “Programme National de Planétologie” (PNP) of CNRS/INSU, France is gratefully acknowledged. We also acknowledge support from the French National Research Agency (ANR-08-JCJC-0102-01). The German CoRoT Team acknowledges the support of DLR grants 50OW204 and 50OW603. We thank the anonymous referee for fruitful comments and suggestions.

PY - 2011/10/11

Y1 - 2011/10/11

N2 - 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∼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.

AB - 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∼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.

KW - binaries

KW - eclipsing

KW - photometric

KW - planetary systems

KW - radial velocities

KW - techniques

UR - https://www.scopus.com/pages/publications/80053526196

U2 - 10.1051/0004-6361/201117374

DO - 10.1051/0004-6361/201117374

M3 - Article

SN - 0004-6361

VL - 534

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A67

ER -

CoRoT LRa02-E2-0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary

Abstract

Keywords

ASJC Scopus subject areas

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