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hal.structure.identifierSSE 2013
dc.contributor.authorHEDELT, P.
hal.structure.identifierSSE 2013
dc.contributor.authorVON PARIS, P.
dc.contributor.authorGODOLT, M.
dc.contributor.authorGEBAUER, S.
hal.structure.identifierZentrum für Astronomie und Astrophysik [Berlin] [ZAA]
dc.contributor.authorGRENFELL, J. L.
dc.contributor.authorRAUER, H.
dc.contributor.authorSCHREIER, F.
hal.structure.identifierSSE 2013
dc.contributor.authorSELSIS, Franck
hal.structure.identifierDLR Institut für Methodik der Fernerkundung / DLR Remote Sensing Technology Institute [IMF]
dc.contributor.authorTRAUTMANN, T.
dc.date.created2013-02-25
dc.date.issued2013-05
dc.identifier.issn0004-6361
dc.description.abstractEnContext. In recent years, more and more transiting terrestrial extrasolar planets have been found. Spectroscopy already yielded the detection of molecular absorption bands in the atmospheres of Jupiter and Neptune-sized exoplanets. Detecting spectral features in the atmosphere of terrestrial planets is the next great challenge for exoplanet characterization. Aims: We investigate the spectral appearance of Earth-like exoplanets in the habitable zone (HZ) of different main sequence (F, G, and K-type) stars at different orbital distances. We furthermore discuss for which of these scenarios biomarker absorption bands and related compounds may be detected during primary or secondary transit with near-future telescopes and instruments. Methods: Atmospheric profiles from a 1D cloud-free atmospheric climate-photochemistry model were used to compute primary and secondary eclipse infrared spectra. The spectra were analyzed taking into account different filter bandpasses of two photometric instruments planned to be mounted to the James Webb Space Telescope (JWST). We analyzed in which filters and for which scenarios molecular absorption bands are detectable when using the space-borne JWST or the ground-based European Extremely Large Telescope (E-ELT). Results: Absorption bands of carbon dioxide (CO2), water (H2O), methane (CH4) and ozone (O3) are clearly visible in both high-resolution spectra as well as in the filters of photometric instruments. However, only during primary eclipse absorption bands of CO2, H2O and O3 are detectable for all scenarios when using photometric instruments and an E-ELT-like telescope setup. CH4 is only detectable at the outer HZ of the K-type star since here the atmospheric modeling results in very high abundances. Since the detectable CO2 and H2O absorption bands overlap, separate bands need to be observed to prove their existence in the planetary atmosphere. In order to detect H2O in a separate band, a ratio S/N > 7 needs to be achieved for E-ELT observations, e.g. by co-adding at least 10 transit observations. Using a space-borne telescope like the JWST enables the detection of CO2 at 4.3 μm, which is not possible for ground-based observations due to the Earth's atmospheric absorption. Hence combining observations of space-borne and ground-based telescopes might allow to detect the presence of the biomarker molecule O3 and the related compounds H2O and CO2 in a planetary atmosphere. Other absorption bands using the JWST can only be detected for much higher S/Ns, which is not achievable by just co-adding transit observations since this would be far beyond the planned mission time of JWST.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enradiative transfer
dc.subject.entechniques: imaging spectroscopy
dc.subject.enplanets and satellites: atmospheres
dc.subject.enplanets and satellites: composition
dc.subject.enplanets and satellites: detection
dc.title.enSpectral features of Earth-like planets and their detectability at different orbital distances around F, G, and K-type stars
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201117723
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.identifier.arxiv1302.5516
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page9
bordeaux.volume553
bordeaux.peerReviewedoui
hal.identifierhal-00824603
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00824603v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2013-05&rft.volume=553&rft.spage=9&rft.epage=9&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=HEDELT,%20P.&VON%20PARIS,%20P.&GODOLT,%20M.&GEBAUER,%20S.&GRENFELL,%20J.%20L.&rft.genre=article


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