Transiting exoplanets from the CoRoT space mission: XI. CoRoT-8b: A hot and dense sub-Saturn around a K1 dwarf

P. Bordé; F. Bouchy; M. Deleuil; J. Cabrera; L. Jorda; C. Lovis; S. Csizmadia; S. Aigrain; J. M. Almenara; R. Alonso; M. Auvergne; A. Baglin; P. Barge; W. Benz; A. S. Bonomo; H. Bruntt; L. Carone; S. Carpano; H. Deeg; R. Dvorak; A. Erikson; S. Ferraz-Mello; M. Fridlund; D. Gandolfi; J. C. Gazzano; M. Gillon; E. Guenther; T. Guillot; P. Guterman; A. Hatzes; M. Havel; G. Hébrard; H. Lammer; A. Léger; M. Mayor; T. Mazeh; C. Moutou; M. Pätzold; F. Pepe; M. Ollivier; D. Queloz; H. Rauer; D. Rouan; B. Samuel; A. Santerne; J. Schneider; B. Tingley; S. Udry; J. Weingrill; G. Wuchterl

doi:10.1051/0004-6361/201014775

Transiting exoplanets from the CoRoT space mission: XI. CoRoT-8b: A hot and dense sub-Saturn around a K1 dwarf

P. Bordé^*, F. Bouchy, M. Deleuil, J. Cabrera, L. Jorda, C. Lovis, S. Csizmadia, S. Aigrain, J. M. Almenara, R. Alonso, M. Auvergne, A. Baglin, P. Barge, W. Benz, A. S. Bonomo, H. Bruntt, L. Carone, S. Carpano, H. Deeg, R. DvorakA. Erikson, S. Ferraz-Mello, M. Fridlund, D. Gandolfi, J. C. Gazzano, M. Gillon, E. Guenther, T. Guillot, P. Guterman, A. Hatzes, M. Havel, G. Hébrard, H. Lammer, A. Léger, M. Mayor, T. Mazeh, C. Moutou, M. Pätzold, F. Pepe, M. Ollivier, D. Queloz, H. Rauer, D. Rouan, B. Samuel, A. Santerne, J. Schneider, B. Tingley, S. Udry, J. Weingrill, G. Wuchterl

^*Corresponding author for this work

School of Physics and Astronomy

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

Abstract

Aims. We report the discovery of CoRoT-8b, a dense small Saturn-class exoplanet that orbits a K1 dwarf in 6.2 days, and we derive its orbital parameters, mass, and radius. Methods. We analyzed two complementary data sets: the photometric transit curve of CoRoT-8b as measured by CoRoT and the radial velocity curve of CoRoT-8 as measured by the HARPS spectrometer. Results. We find that CoRoT-8b is on a circular orbit with a semi-major axis of 0.063 ± 0.001 AU. It has a radius of 0.57 ± 0.02 R_J, a mass of 0.22 ± 0.03 M_J, and therefore a mean density of 1.6 ± 0.1 g cm^-3. Conclusions. With 67% of the size of Saturn and 72% of its mass, CoRoT-8b has a density comparable to that of Neptune (1.76 g cm^-3). We estimate its content in heavy elements to be 47-63 M, and the mass of its hydrogen-helium envelope to be 7-23 M. At 0.063 AU, the thermal loss of hydrogen of CoRoT-8b should be no more than ∼0.1% over an assumed integrated lifetime of 3 Ga.

Original language	English
Article number	A66
Journal	Astronomy and Astrophysics
Volume	520
Issue number	10
DOIs	https://doi.org/10.1051/0004-6361/201014775
State	Published - 2010

Keywords

planets and satellites: detection
planets and satellites: fundamental parameters
stars: fundamental parameters
techniques: photometric
techniques: radial velocities
techniques: spectroscopic

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10.1051/0004-6361/201014775

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Bordé, P., Bouchy, F., Deleuil, M., Cabrera, J., Jorda, L., Lovis, C., Csizmadia, S., Aigrain, S., Almenara, J. M., Alonso, R., Auvergne, M., Baglin, A., Barge, P., Benz, W., Bonomo, A. S., Bruntt, H., Carone, L., Carpano, S., Deeg, H., ... Wuchterl, G. (2010). Transiting exoplanets from the CoRoT space mission: XI. CoRoT-8b: A hot and dense sub-Saturn around a K1 dwarf. Astronomy and Astrophysics, 520(10), [A66]. https://doi.org/10.1051/0004-6361/201014775

@article{1a745539af004d7ab0f22302a39b0a73,

title = "Transiting exoplanets from the CoRoT space mission: XI. CoRoT-8b: A hot and dense sub-Saturn around a K1 dwarf",

abstract = "Aims. We report the discovery of CoRoT-8b, a dense small Saturn-class exoplanet that orbits a K1 dwarf in 6.2 days, and we derive its orbital parameters, mass, and radius. Methods. We analyzed two complementary data sets: the photometric transit curve of CoRoT-8b as measured by CoRoT and the radial velocity curve of CoRoT-8 as measured by the HARPS spectrometer. Results. We find that CoRoT-8b is on a circular orbit with a semi-major axis of 0.063 ± 0.001 AU. It has a radius of 0.57 ± 0.02 RJ, a mass of 0.22 ± 0.03 MJ, and therefore a mean density of 1.6 ± 0.1 g cm-3. Conclusions. With 67% of the size of Saturn and 72% of its mass, CoRoT-8b has a density comparable to that of Neptune (1.76 g cm-3). We estimate its content in heavy elements to be 47-63 M, and the mass of its hydrogen-helium envelope to be 7-23 M. At 0.063 AU, the thermal loss of hydrogen of CoRoT-8b should be no more than ∼0.1% over an assumed integrated lifetime of 3 Ga.",

keywords = "planets and satellites: detection, planets and satellites: fundamental parameters, stars: fundamental parameters, techniques: photometric, techniques: radial velocities, techniques: spectroscopic",

author = "P. Bord{\'e} and F. Bouchy and M. Deleuil and J. Cabrera and L. Jorda and C. Lovis and S. Csizmadia and S. Aigrain and Almenara, {J. M.} and R. Alonso and M. Auvergne and A. Baglin and P. Barge and W. Benz and Bonomo, {A. S.} and H. Bruntt and L. Carone and S. Carpano and H. Deeg and R. Dvorak and A. Erikson and S. Ferraz-Mello and M. Fridlund and D. Gandolfi and Gazzano, {J. C.} and M. Gillon and E. Guenther and T. Guillot and P. Guterman and A. Hatzes and M. Havel and G. H{\'e}brard and H. Lammer and A. L{\'e}ger and M. Mayor and T. Mazeh and C. Moutou and M. P{\"a}tzold and F. Pepe and M. Ollivier and D. Queloz and H. Rauer and D. Rouan and B. Samuel and A. Santerne and J. Schneider and B. Tingley and S. Udry and J. Weingrill and G. Wuchterl",

year = "2010",

doi = "10.1051/0004-6361/201014775",

language = "אנגלית",

volume = "520",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "10",

}

Bordé, P, Bouchy, F, Deleuil, M, Cabrera, J, Jorda, L, Lovis, C, Csizmadia, S, Aigrain, S, Almenara, JM, Alonso, R, Auvergne, M, Baglin, A, Barge, P, Benz, W, Bonomo, AS, Bruntt, H, Carone, L, Carpano, S, Deeg, H, Dvorak, R, Erikson, A, Ferraz-Mello, S, Fridlund, M, Gandolfi, D, Gazzano, JC, Gillon, M, Guenther, E, Guillot, T, Guterman, P, Hatzes, A, Havel, M, Hébrard, G, Lammer, H, Léger, A, Mayor, M, Mazeh, T, Moutou, C, Pätzold, M, Pepe, F, Ollivier, M, Queloz, D, Rauer, H, Rouan, D, Samuel, B, Santerne, A, Schneider, J, Tingley, B, Udry, S, Weingrill, J & Wuchterl, G 2010, 'Transiting exoplanets from the CoRoT space mission: XI. CoRoT-8b: A hot and dense sub-Saturn around a K1 dwarf', Astronomy and Astrophysics, vol. 520, no. 10, A66. https://doi.org/10.1051/0004-6361/201014775

TY - JOUR

T1 - Transiting exoplanets from the CoRoT space mission

T2 - XI. CoRoT-8b: A hot and dense sub-Saturn around a K1 dwarf

AU - Bordé, P.

AU - Bouchy, F.

AU - Deleuil, M.

AU - Cabrera, J.

AU - Jorda, L.

AU - Lovis, C.

AU - Csizmadia, S.

AU - Aigrain, S.

AU - Almenara, J. M.

AU - Alonso, R.

AU - Auvergne, M.

AU - Baglin, A.

AU - Barge, P.

AU - Benz, W.

AU - Bonomo, A. S.

AU - Bruntt, H.

AU - Carone, L.

AU - Carpano, S.

AU - Deeg, H.

AU - Dvorak, R.

AU - Erikson, A.

AU - Ferraz-Mello, S.

AU - Fridlund, M.

AU - Gandolfi, D.

AU - Gazzano, J. C.

AU - Gillon, M.

AU - Guenther, E.

AU - Guillot, T.

AU - Guterman, P.

AU - Hatzes, A.

AU - Havel, M.

AU - Hébrard, G.

AU - Lammer, H.

AU - Léger, A.

AU - Mayor, M.

AU - Mazeh, T.

AU - Moutou, C.

AU - Pätzold, M.

AU - Pepe, F.

AU - Ollivier, M.

AU - Queloz, D.

AU - Rauer, H.

AU - Rouan, D.

AU - Samuel, B.

AU - Santerne, A.

AU - Schneider, J.

AU - Tingley, B.

AU - Udry, S.

AU - Weingrill, J.

AU - Wuchterl, G.

PY - 2010

Y1 - 2010

N2 - Aims. We report the discovery of CoRoT-8b, a dense small Saturn-class exoplanet that orbits a K1 dwarf in 6.2 days, and we derive its orbital parameters, mass, and radius. Methods. We analyzed two complementary data sets: the photometric transit curve of CoRoT-8b as measured by CoRoT and the radial velocity curve of CoRoT-8 as measured by the HARPS spectrometer. Results. We find that CoRoT-8b is on a circular orbit with a semi-major axis of 0.063 ± 0.001 AU. It has a radius of 0.57 ± 0.02 RJ, a mass of 0.22 ± 0.03 MJ, and therefore a mean density of 1.6 ± 0.1 g cm-3. Conclusions. With 67% of the size of Saturn and 72% of its mass, CoRoT-8b has a density comparable to that of Neptune (1.76 g cm-3). We estimate its content in heavy elements to be 47-63 M, and the mass of its hydrogen-helium envelope to be 7-23 M. At 0.063 AU, the thermal loss of hydrogen of CoRoT-8b should be no more than ∼0.1% over an assumed integrated lifetime of 3 Ga.

AB - Aims. We report the discovery of CoRoT-8b, a dense small Saturn-class exoplanet that orbits a K1 dwarf in 6.2 days, and we derive its orbital parameters, mass, and radius. Methods. We analyzed two complementary data sets: the photometric transit curve of CoRoT-8b as measured by CoRoT and the radial velocity curve of CoRoT-8 as measured by the HARPS spectrometer. Results. We find that CoRoT-8b is on a circular orbit with a semi-major axis of 0.063 ± 0.001 AU. It has a radius of 0.57 ± 0.02 RJ, a mass of 0.22 ± 0.03 MJ, and therefore a mean density of 1.6 ± 0.1 g cm-3. Conclusions. With 67% of the size of Saturn and 72% of its mass, CoRoT-8b has a density comparable to that of Neptune (1.76 g cm-3). We estimate its content in heavy elements to be 47-63 M, and the mass of its hydrogen-helium envelope to be 7-23 M. At 0.063 AU, the thermal loss of hydrogen of CoRoT-8b should be no more than ∼0.1% over an assumed integrated lifetime of 3 Ga.

KW - planets and satellites: detection

KW - planets and satellites: fundamental parameters

KW - stars: fundamental parameters

KW - techniques: photometric

KW - techniques: radial velocities

KW - techniques: spectroscopic

UR - http://www.scopus.com/inward/record.url?scp=77957709732&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201014775

DO - 10.1051/0004-6361/201014775

M3 - מאמר

AN - SCOPUS:77957709732

VL - 520

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

IS - 10

M1 - A66

ER -

Transiting exoplanets from the CoRoT space mission: XI. CoRoT-8b: A hot and dense sub-Saturn around a K1 dwarf

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Keywords

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