Transiting exoplanets from the CoRoT space mission. XI. CoRoT-8b: a hot and dense sub-Saturn around a K1 dwarf
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. We analyzed two complementary data sets: the photometric transit curve of CoRoT-8b as measured by CoRoT and the radial velocity curve...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2010
|
| _version_ | 1797103521482407936 |
|---|---|
| author | Bordé, P Bouchy, F Deleuil, M Cabrera, J Jorda, L Lovis, C Csizmadia, S Aigrain, S Almenara, J Alonso, R Auvergne, M Baglin, A Barge, P Benz, W Bonomo, A Bruntt, H Carone, L Carpano, S Deeg, H Dvorak, R Erikson, A Ferraz-Mello, S Fridlund, M Gandolfi, D Gazzano, J |
| author_facet | Bordé, P Bouchy, F Deleuil, M Cabrera, J Jorda, L Lovis, C Csizmadia, S Aigrain, S Almenara, J Alonso, R Auvergne, M Baglin, A Barge, P Benz, W Bonomo, A Bruntt, H Carone, L Carpano, S Deeg, H Dvorak, R Erikson, A Ferraz-Mello, S Fridlund, M Gandolfi, D Gazzano, J |
| author_sort | Bordé, P |
| collection | OXFORD |
| description | 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. 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. 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 1.6 +/- 0.1 g/cm^3. 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 Earth masses, and the mass of its hydrogen-helium envelope to be 7-23 Earth masses. At 0.063 AU, the thermal loss of hydrogen of CoRoT-8b should be no more than about 0.1 % over an assumed integrated lifetime of 3~Ga. |
| first_indexed | 2024-03-07T06:21:13Z |
| format | Journal article |
| id | oxford-uuid:f2c57428-e15a-4fec-a181-13f6a32f975c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:21:13Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | oxford-uuid:f2c57428-e15a-4fec-a181-13f6a32f975c2022-03-27T12:06:48ZTransiting exoplanets from the CoRoT space mission. XI. CoRoT-8b: a hot and dense sub-Saturn around a K1 dwarfJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f2c57428-e15a-4fec-a181-13f6a32f975cEnglishSymplectic Elements at Oxford2010Bordé, PBouchy, FDeleuil, MCabrera, JJorda, LLovis, CCsizmadia, SAigrain, SAlmenara, JAlonso, RAuvergne, MBaglin, ABarge, PBenz, WBonomo, ABruntt, HCarone, LCarpano, SDeeg, HDvorak, RErikson, AFerraz-Mello, SFridlund, MGandolfi, DGazzano, JWe 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. 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. 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 1.6 +/- 0.1 g/cm^3. 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 Earth masses, and the mass of its hydrogen-helium envelope to be 7-23 Earth masses. At 0.063 AU, the thermal loss of hydrogen of CoRoT-8b should be no more than about 0.1 % over an assumed integrated lifetime of 3~Ga. |
| spellingShingle | Bordé, P Bouchy, F Deleuil, M Cabrera, J Jorda, L Lovis, C Csizmadia, S Aigrain, S Almenara, J Alonso, R Auvergne, M Baglin, A Barge, P Benz, W Bonomo, A Bruntt, H Carone, L Carpano, S Deeg, H Dvorak, R Erikson, A Ferraz-Mello, S Fridlund, M Gandolfi, D Gazzano, J Transiting exoplanets from the CoRoT space mission. XI. CoRoT-8b: a hot and dense sub-Saturn around a K1 dwarf |
| title | Transiting exoplanets from the CoRoT space mission. XI. CoRoT-8b: a hot
and dense sub-Saturn around a K1 dwarf |
| title_full | Transiting exoplanets from the CoRoT space mission. XI. CoRoT-8b: a hot
and dense sub-Saturn around a K1 dwarf |
| title_fullStr | Transiting exoplanets from the CoRoT space mission. XI. CoRoT-8b: a hot
and dense sub-Saturn around a K1 dwarf |
| title_full_unstemmed | Transiting exoplanets from the CoRoT space mission. XI. CoRoT-8b: a hot
and dense sub-Saturn around a K1 dwarf |
| title_short | Transiting exoplanets from the CoRoT space mission. XI. CoRoT-8b: a hot
and dense sub-Saturn around a K1 dwarf |
| title_sort | transiting exoplanets from the corot space mission xi corot 8b a hot and dense sub saturn around a k1 dwarf |
| work_keys_str_mv | AT bordep transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT bouchyf transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT deleuilm transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT cabreraj transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT jordal transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT lovisc transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT csizmadias transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT aigrains transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT almenaraj transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT alonsor transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT auvergnem transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT baglina transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT bargep transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT benzw transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT bonomoa transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT bruntth transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT caronel transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT carpanos transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT deegh transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT dvorakr transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT eriksona transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT ferrazmellos transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT fridlundm transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT gandolfid transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf AT gazzanoj transitingexoplanetsfromthecorotspacemissionxicorot8bahotanddensesubsaturnaroundak1dwarf |