Transiting exoplanets from the CoRoT space mission: XXVI. CoRoT-24: A transiting multiplanet system

R. Alonso; C. Moutou; M. Endl; J. M. Almenara; E. W. Guenther; M. Deleuil; A. Hatzes; S. Aigrain; M. Auvergne; A. Baglin; P. Barge; A. S. Bonomo; P. Bordé; F. Bouchy; C. Cavarroc; J. Cabrera; S. Carpano; Sz Csizmadia; W. D. Cochran; H. J. Deeg; R. F. Díaz; R. Dvorak; A. Erikson; S. Ferraz-Mello; M. Fridlund; T. Fruth; D. Gandolfi; M. Gillon; S. Grziwa; T. Guillot; G. Hébrard; L. Jorda; A. Léger; H. Lammer; C. Lovis; P. J. Macqueen; T. Mazeh; A. Ofir; M. Ollivier; T. Pasternacki; M. Pätzold; D. Queloz; H. Rauer; D. Rouan; A. Santerne; J. Schneider; M. Tadeu Dos Santos; B. Tingley; R. Titz-Weider; J. Weingrill; G. Wuchterl

doi:10.1051/0004-6361/201118662

Transiting exoplanets from the CoRoT space mission: XXVI. CoRoT-24: A transiting multiplanet system

R. Alonso, C. Moutou, M. Endl, J. M. Almenara, E. W. Guenther, M. Deleuil, A. Hatzes, S. Aigrain, M. Auvergne, A. Baglin, P. Barge, A. S. Bonomo, P. Bordé, F. Bouchy, C. Cavarroc, J. Cabrera, S. Carpano, Sz Csizmadia, W. D. Cochran, H. J. DeegR. F. Díaz, R. Dvorak, A. Erikson, S. Ferraz-Mello, M. Fridlund, T. Fruth, D. Gandolfi, M. Gillon, S. Grziwa, T. Guillot, G. Hébrard, L. Jorda, A. Léger, H. Lammer, C. Lovis, P. J. Macqueen, T. Mazeh, A. Ofir, M. Ollivier, T. Pasternacki, M. Pätzold, D. Queloz, H. Rauer, D. Rouan, A. Santerne, J. Schneider, M. Tadeu Dos Santos, B. Tingley, R. Titz-Weider, J. Weingrill, G. Wuchterl

School of Physics and Astronomy

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Abstract

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.

Original language	English
Article number	A112
Journal	Astronomy and Astrophysics
Volume	567
DOIs	https://doi.org/10.1051/0004-6361/201118662
State	Published - Jul 2014

Keywords

Planetary systems
Techniques: photometric
Techniques: radial velocities
Techniques: spectroscopic

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10.1051/0004-6361/201118662

Cite this

Alonso, R., Moutou, C., Endl, M., Almenara, J. M., Guenther, E. W., Deleuil, M., Hatzes, A., Aigrain, S., Auvergne, M., Baglin, A., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Cavarroc, C., Cabrera, J., Carpano, S., Csizmadia, S., Cochran, W. D., ... Wuchterl, G. (2014). Transiting exoplanets from the CoRoT space mission: XXVI. CoRoT-24: A transiting multiplanet system. Astronomy and Astrophysics, 567, [A112]. https://doi.org/10.1051/0004-6361/201118662

@article{cd70e8ff4be841cdb251fddab3e2cf91,

title = "Transiting exoplanets from the CoRoT space mission: XXVI. CoRoT-24: A transiting multiplanet system",

abstract = "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.",

keywords = "Planetary systems, Techniques: photometric, Techniques: radial velocities, Techniques: spectroscopic",

author = "R. Alonso and C. Moutou and M. Endl and Almenara, {J. M.} and Guenther, {E. W.} and M. Deleuil and A. Hatzes and S. Aigrain and M. Auvergne and A. Baglin and P. Barge and Bonomo, {A. S.} and P. Bord{\'e} and F. Bouchy and C. Cavarroc and J. Cabrera and S. Carpano and Sz Csizmadia and Cochran, {W. D.} and Deeg, {H. J.} and D{\'i}az, {R. F.} and R. Dvorak and A. Erikson and S. Ferraz-Mello and M. Fridlund and T. Fruth and D. Gandolfi and M. Gillon and S. Grziwa and T. Guillot and G. H{\'e}brard and L. Jorda and A. L{\'e}ger and H. Lammer and C. Lovis and Macqueen, {P. J.} and T. Mazeh and A. Ofir and M. Ollivier and T. Pasternacki and M. P{\"a}tzold and D. Queloz and H. Rauer and D. Rouan and A. Santerne and J. Schneider and {Tadeu Dos Santos}, M. and B. Tingley and R. Titz-Weider and J. Weingrill and G. Wuchterl",

note = "Funding Information: We wish to thank the ESO staff for their support and for their contribution to the success of the HARPS project and operation at ESO La Silla Observatory. Some of the data presented are from observations made with the IAC80 operated at Teide Observatory on the island of Tenerife by the Instituto de Astrof{\'i}sica de Canarias. The team at the IAC acknowledges support by grants ESP2007-65480-C02-02 and AYA2010-20982-C02-02 of the Spanish Ministry of Science and Innovation (MICINN). The CoRoT/Exoplanet catalogue (Exodat) was made possible by observations collected for years at the Isaac Newton Telescope (INT), operated on the island of La Palma by the Isaac Newton group in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrof{\'i}sica de Canarias. The German CoRoT team (TLS and University of Cologne) acknowledges DLR grants 50OW0204, 50OW0603, and 50QM1004. The French team wishes to thank the CNES and the French National Research Agency (ANR-08- JCJC- 0102-01) for their continuous support to our planet search program. The Swiss team acknowledges the ESA PRODEX program and the Swiss National Science Foundation for their continuous support on CoRoT ground follow-up. R. Alonso acknowledges support from Spanish Ministry through its Ram{\'o}n y Cajal program RYC-2010-06519. A.S. Bonomo acknowledges a CNES grant. S. Aigrain acknowledges STFC grant ST/G002266. M. Gillon acknowledges support from the Belgian Science Policy Office in the form of a Return Grant. M. Endl, W. D. Cochran and P. J. MacQueen were supported by NASA Origins of Solar Systems grant NNX09AB30G. T. Mazeh acknowledges support from the Israeli Science Foundation (grant No. 655/07). A. Santerne acknowledges support from the European Research Council/European Community under the FP7 through Starting Grant agreement number 239953. This research has made use of the SIMBAD database, operated at the CDS, Strasbourg, France, and of NASA{\textquoteright}s Astrophysics Data System. Part of the data presented herein were obtained at the W. M. Keck Observatory from telescope time allocated to the National Aeronautics and Space Administration through the agency{\textquoteright}s scientific partnership with the California Institute of Technology and the University of California. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.",

year = "2014",

month = jul,

doi = "10.1051/0004-6361/201118662",

language = "אנגלית",

volume = "567",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Alonso, R, Moutou, C, Endl, M, Almenara, JM, Guenther, EW, Deleuil, M, Hatzes, A, Aigrain, S, Auvergne, M, Baglin, A, Barge, P, Bonomo, AS, Bordé, P, Bouchy, F, Cavarroc, C, Cabrera, J, Carpano, S, Csizmadia, S, Cochran, WD, Deeg, HJ, Díaz, RF, Dvorak, R, Erikson, A, Ferraz-Mello, S, Fridlund, M, Fruth, T, Gandolfi, D, Gillon, M, Grziwa, S, Guillot, T, Hébrard, G, Jorda, L, Léger, A, Lammer, H, Lovis, C, Macqueen, PJ, Mazeh, T, Ofir, A, Ollivier, M, Pasternacki, T, Pätzold, M, Queloz, D, Rauer, H, Rouan, D, Santerne, A, Schneider, J, Tadeu Dos Santos, M, Tingley, B, Titz-Weider, R, Weingrill, J & Wuchterl, G 2014, 'Transiting exoplanets from the CoRoT space mission: XXVI. CoRoT-24: A transiting multiplanet system', Astronomy and Astrophysics, vol. 567, A112. https://doi.org/10.1051/0004-6361/201118662

TY - JOUR

T1 - Transiting exoplanets from the CoRoT space mission

T2 - XXVI. CoRoT-24: A transiting multiplanet system

AU - Alonso, R.

AU - Moutou, C.

AU - Endl, M.

AU - Almenara, J. M.

AU - Guenther, E. W.

AU - Deleuil, M.

AU - Hatzes, A.

AU - Aigrain, S.

AU - Auvergne, M.

AU - Baglin, A.

AU - Barge, P.

AU - Bonomo, A. S.

AU - Bordé, P.

AU - Bouchy, F.

AU - Cavarroc, C.

AU - Cabrera, J.

AU - Carpano, S.

AU - Csizmadia, Sz

AU - Cochran, W. D.

AU - Deeg, H. J.

AU - Díaz, R. F.

AU - Dvorak, R.

AU - Erikson, A.

AU - Ferraz-Mello, S.

AU - Fridlund, M.

AU - Fruth, T.

AU - Gandolfi, D.

AU - Gillon, M.

AU - Grziwa, S.

AU - Guillot, T.

AU - Hébrard, G.

AU - Jorda, L.

AU - Léger, A.

AU - Lammer, H.

AU - Lovis, C.

AU - Macqueen, P. J.

AU - Mazeh, T.

AU - Ofir, A.

AU - Ollivier, M.

AU - Pasternacki, T.

AU - Pätzold, M.

AU - Queloz, D.

AU - Rauer, H.

AU - Rouan, D.

AU - Santerne, A.

AU - Schneider, J.

AU - Tadeu Dos Santos, M.

AU - Tingley, B.

AU - Titz-Weider, R.

AU - Weingrill, J.

AU - Wuchterl, G.

N1 - Funding Information: We wish to thank the ESO staff for their support and for their contribution to the success of the HARPS project and operation at ESO La Silla Observatory. Some of the data presented are from observations made with the IAC80 operated at Teide Observatory on the island of Tenerife by the Instituto de Astrofísica de Canarias. The team at the IAC acknowledges support by grants ESP2007-65480-C02-02 and AYA2010-20982-C02-02 of the Spanish Ministry of Science and Innovation (MICINN). The CoRoT/Exoplanet catalogue (Exodat) was made possible by observations collected for years at the Isaac Newton Telescope (INT), operated on the island of La Palma by the Isaac Newton group in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias. The German CoRoT team (TLS and University of Cologne) acknowledges DLR grants 50OW0204, 50OW0603, and 50QM1004. The French team wishes to thank the CNES and the French National Research Agency (ANR-08- JCJC- 0102-01) for their continuous support to our planet search program. The Swiss team acknowledges the ESA PRODEX program and the Swiss National Science Foundation for their continuous support on CoRoT ground follow-up. R. Alonso acknowledges support from Spanish Ministry through its Ramón y Cajal program RYC-2010-06519. A.S. Bonomo acknowledges a CNES grant. S. Aigrain acknowledges STFC grant ST/G002266. M. Gillon acknowledges support from the Belgian Science Policy Office in the form of a Return Grant. M. Endl, W. D. Cochran and P. J. MacQueen were supported by NASA Origins of Solar Systems grant NNX09AB30G. T. Mazeh acknowledges support from the Israeli Science Foundation (grant No. 655/07). A. Santerne acknowledges support from the European Research Council/European Community under the FP7 through Starting Grant agreement number 239953. This research has made use of the SIMBAD database, operated at the CDS, Strasbourg, France, and of NASA’s Astrophysics Data System. Part of the data presented herein were obtained at the W. M. Keck Observatory from telescope time allocated to the National Aeronautics and Space Administration through the agency’s scientific partnership with the California Institute of Technology and the University of California. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

PY - 2014/7

Y1 - 2014/7

N2 - 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.

AB - 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.

KW - Planetary systems

KW - Techniques: photometric

KW - Techniques: radial velocities

KW - Techniques: spectroscopic

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JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

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ER -

Transiting exoplanets from the CoRoT space mission: XXVI. CoRoT-24: A transiting multiplanet system

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