Herschel /PACS spectroscopy of trace gases of the stratosphere of Titan

Aims. We investigate the composition of Titan’s stratosphere from new medium-resolution far-infrared observations performed with the full range of Herschel’s Photodetector Array Camera and Spectrometer (PACS) (51–220 μm at a resolution λ/Δλ ranging from 950 to 5500 depending on wavelength and gratin...

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Autores: Rengel, M., Sagawa, H., Hartogh, Paul, Lellouch, E., Feuchtgruber, H., Moreno, R., Jarchow, C., Courtin, R., Cernicharo, José, Lara, Luisa María
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/398962
Acesso em linha:http://hdl.handle.net/10261/398962
Access Level:acceso abierto
Palavra-chave:Planets and satellites: atmospheres
Planets and satellites: individual: Titan
Techniques: spectroscopic
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spelling Herschel /PACS spectroscopy of trace gases of the stratosphere of TitanRengel, M.Sagawa, H.Hartogh, PaulLellouch, E.Feuchtgruber, H.Moreno, R.Jarchow, C.Courtin, R.Cernicharo, JoséLara, Luisa MaríaPlanets and satellites: atmospheresPlanets and satellites: individual: TitanTechniques: spectroscopicAims. We investigate the composition of Titan’s stratosphere from new medium-resolution far-infrared observations performed with the full range of Herschel’s Photodetector Array Camera and Spectrometer (PACS) (51–220 μm at a resolution λ/Δλ ranging from 950 to 5500 depending on wavelength and grating order).Methods. Using PACS, we obtained the spectral emission of several features of the Titan’s stratosphere. We used a line-by-line radiative transfer code and the least-squares fitting technique to infer the abundances of the trace constituents.Results. Numerous spectral features attributable to CH4, CO, HCN, and H2O are present. From the flux density spectrum measured and by a detailed comparison with synthetic spectra, we constrain the stratospheric abundance of CH4, which is assumed to be constant with altitude, to be 1.29 ± 0.03%. Similarly, we constrain the abundance of CO to be 50 ± 2 ppm, and the HCN vertical distribution consistent with an increase from 40 ppb at ~100 km to ~4 ppm at ~200 km, which is an altitude region where the HCN signatures are sensitive. Measurements of three H2O rotational lines confirm the H2O distribution profile recently obtained with Herschel. Furthermore, we determine the isotopic ratios 12C/13C in CO and HCN to be 124 ± 58, and 66 ± 35, respectively. Comparisons between our results and the values derived with other instruments show that our results are consistent with the vertical distributions and isotopic ratios in previous studies, except for the HCN distribution obtained with Cassini/CIRS, which does not agree with the PACS lines at the 1-σ confidence interval. © ESO, 2013We thank the mission planners for the scheduling of these observations, L. Rezac for helpful discussions and the anonymous referee for helping to improve the manuscript. PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KUL, CSL, IMEC (Belgium); CEA, OAMP (France); MPIA (Germany); IFSI, OAP/AOT, OAA/CAISMI, LENS, SISSA (Italy); IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI (Italy), and CICT/MCT (Spain).Peer reviewedEDP SciencesCentre National D'Etudes Spatiales (France)German Research FoundationAgenzia Spaziale ItalianaMinisterio de Ciencia y Tecnología (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/398962reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1051/0004-6361/201321945Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3989622026-05-22T06:33:51Z
dc.title.none.fl_str_mv Herschel /PACS spectroscopy of trace gases of the stratosphere of Titan
title Herschel /PACS spectroscopy of trace gases of the stratosphere of Titan
spellingShingle Herschel /PACS spectroscopy of trace gases of the stratosphere of Titan
Rengel, M.
Planets and satellites: atmospheres
Planets and satellites: individual: Titan
Techniques: spectroscopic
title_short Herschel /PACS spectroscopy of trace gases of the stratosphere of Titan
title_full Herschel /PACS spectroscopy of trace gases of the stratosphere of Titan
title_fullStr Herschel /PACS spectroscopy of trace gases of the stratosphere of Titan
title_full_unstemmed Herschel /PACS spectroscopy of trace gases of the stratosphere of Titan
title_sort Herschel /PACS spectroscopy of trace gases of the stratosphere of Titan
dc.creator.none.fl_str_mv Rengel, M.
Sagawa, H.
Hartogh, Paul
Lellouch, E.
Feuchtgruber, H.
Moreno, R.
Jarchow, C.
Courtin, R.
Cernicharo, José
Lara, Luisa María
author Rengel, M.
author_facet Rengel, M.
Sagawa, H.
Hartogh, Paul
Lellouch, E.
Feuchtgruber, H.
Moreno, R.
Jarchow, C.
Courtin, R.
Cernicharo, José
Lara, Luisa María
author_role author
author2 Sagawa, H.
Hartogh, Paul
Lellouch, E.
Feuchtgruber, H.
Moreno, R.
Jarchow, C.
Courtin, R.
Cernicharo, José
Lara, Luisa María
author2_role author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Centre National D'Etudes Spatiales (France)
German Research Foundation
Agenzia Spaziale Italiana
Ministerio de Ciencia y Tecnología (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Planets and satellites: atmospheres
Planets and satellites: individual: Titan
Techniques: spectroscopic
topic Planets and satellites: atmospheres
Planets and satellites: individual: Titan
Techniques: spectroscopic
description Aims. We investigate the composition of Titan’s stratosphere from new medium-resolution far-infrared observations performed with the full range of Herschel’s Photodetector Array Camera and Spectrometer (PACS) (51–220 μm at a resolution λ/Δλ ranging from 950 to 5500 depending on wavelength and grating order).
publishDate 2014
dc.date.none.fl_str_mv 2014
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/398962
url http://hdl.handle.net/10261/398962
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1051/0004-6361/201321945
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.811543

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