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The puzzling chemical composition of GJ 436b's atmosphere: influence of tidal heating on the chemistry
hal.structure.identifier | SSE 2014 | |
dc.contributor.author | AGÚNDEZ, M. | |
hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
hal.structure.identifier | Observatoire aquitain des sciences de l'univers [OASU] | |
hal.structure.identifier | Université Sciences et Technologies - Bordeaux 1 [UB] | |
dc.contributor.author | VENOT, O. | |
hal.structure.identifier | SSE 2014 | |
dc.contributor.author | SELSIS, Franck | |
dc.contributor.author | IRO, N. | |
dc.date.created | 2013-12-10 | |
dc.date.issued | 2014 | |
dc.identifier.issn | 0004-637X | |
dc.description.abstractEn | The dissipation of the tidal energy deposited on eccentric planets may induce a heating of the planet that affects its atmospheric thermal structure. Here we study the influence of tidal heating on the atmospheric composition of the eccentric (e = 0.16) "hot Neptune" GJ 436b, for which inconclusive chemical abundances are retrieved from multiwavelength photometric observations carried out during primary transit and secondary eclipse. We build up a one-dimensional model of GJ 436b's atmosphere in the vertical direction and compute the pressure-temperature and molecular abundances profiles for various plausible internal temperatures of the planet (up to 560 K) and metallicities (from solar to 100 times solar), using a radiative-convective model and a chemical model which includes thermochemical kinetics, vertical mixing, and photochemistry. We find that the CO/CH4 abundance ratio increases with metallicity and tidal heating, and ranges from 1/20 to 1000 within the ranges of metallicity and internal temperature explored. Water vapour locks most of the oxygen and reaches a very high abundance, whatever the metallicity and internal temperature of the planet. The CO2/H2O abundance ratio increases dramatically with metallicity, and takes values between 1e-5-1e-4 with solar elemental abundances and 0.1 for a metallicity 100 times solar. None of the atmospheric models based on solid physical and chemical grounds provide a fully satisfactory agreement with available observational data, although the comparison of calculated spectra and observations seem to point to models with a high metallicity and efficient tidal heating, in which high CO/CH4 abundance ratios and warm temperatures in the dayside atmosphere are favoured. | |
dc.language.iso | en | |
dc.publisher | American Astronomical Society | |
dc.title.en | The puzzling chemical composition of GJ 436b's atmosphere: influence of tidal heating on the chemistry | |
dc.type | Article de revue | |
dc.identifier.doi | 10.1088/0004-637X/781/2/68 | |
dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP] | |
dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP] | |
dc.identifier.arxiv | 1312.3007 | |
bordeaux.journal | The Astrophysical Journal | |
bordeaux.page | id. 68 | |
bordeaux.volume | 781 | |
bordeaux.issue | 2 | |
bordeaux.peerReviewed | oui | |
hal.identifier | hal-00949326 | |
hal.version | 1 | |
hal.popular | non | |
hal.audience | Internationale | |
hal.origin.link | https://hal.archives-ouvertes.fr//hal-00949326v1 | |
bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The%20Astrophysical%20Journal&rft.date=2014&rft.volume=781&rft.issue=2&rft.spage=id.%2068&rft.epage=id.%2068&rft.eissn=0004-637X&rft.issn=0004-637X&rft.au=AG%C3%9ANDEZ,%20M.&VENOT,%20O.&SELSIS,%20Franck&IRO,%20N.&rft.genre=article |
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