Article (Scientific journals)
First results of Herschel-PACS observations of Neptune
Lellouch, Emmanuel; Hartogh, Paul; Feuchtgruber, H. et al.
2010In Astronomy and Astrophysics, 518, p. 152
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Keywords :
planets and satellites: atmospheres; planets and satellites: individual: Neptune; planets and satellites: composition; techniques: spectroscopic
Abstract :
[en] We report on the initial analysis of a Herschel-PACS full range spectrum of Neptune, covering the 51-220 μm range with a mean resolving power of ~3000, and complemented by a dedicated observation of CH[SUB]4[/SUB] at 120 μm. Numerous spectral features due to HD (R(0) and R(1)), H[SUB]2[/SUB]O, CH[SUB]4[/SUB], and CO are present, but so far no new species have been found. Our results indicate that (i) Neptune's mean thermal profile is warmer by ~3 K than inferred from the Voyager radio-occultation; (ii) the D/H mixing ratio is (4.5 ± 1) × 10[SUP]-5[/SUP], confirming the enrichment of Neptune in deuterium over the protosolar value (~2.1 × 10[SUP]-5[/SUP]); (iii) the CH[SUB]4[/SUB] mixing ratio in the mid stratosphere is (1.5 ± 0.2) × 10[SUP]-3[/SUP], and CH[SUB]4[/SUB] appears to decrease in the lower stratosphere at a rate consistent with local saturation, in agreement with the scenario of CH[SUB]4[/SUB] stratospheric injection from Neptune's warm south polar region; (iv) the H[SUB]2[/SUB]O stratospheric column is (2.1 ± 0.5) × 10[SUP]14[/SUP] cm[SUP]-2[/SUP] but its vertical distribution is still to be determined, so the H[SUB]2[/SUB]O external flux remains uncertain by over an order of magnitude; and (v) the CO stratospheric abundance is about twice the tropospheric value, confirming the dual origin of CO suspected from ground-based millimeter/submillimeter observations. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Lellouch, Emmanuel;  LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France
Hartogh, Paul;  Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
Feuchtgruber, H.;  Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany
Vandenbussche, B.;  Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Belgium
de Graauw, T.;  SRON, Groningen, The Netherlands
Moreno, R.;  LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France
Jarchow, C.;  Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
Cavalié, T.;  Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
Orton, G.;  JPL, California Institute of Technology, Pasadena, USA
Banaszkiewicz, M.;  Space Research Centre, Polish Academy of Science, Warszawa, Poland
Blecka, M. I.;  Space Research Centre, Polish Academy of Science, Warszawa, Poland
Bockelée-Morvan, D.;  LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France
Crovisier, J.;  LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France
Encrenaz, T.;  LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France
Fulton, T.;  Blue Sky Spectroscopy Inc., Lethbridge, Alberta, Canada
Küppers, M.;  European Space Astronomy Center, Madrid, Spain
Lara, L. M.;  Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain
Lis, D. C.;  California Institute of Technology, Pasadena, USA
Medvedev, A. S.;  Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
Rengel, M.;  Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
Sagawa, H.;  Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
Swinyard, B.;  Rutherford Appleton Laboratory, Oxfordshire, U K
Szutowicz, S.;  Space Research Centre, Polish Academy of Science, Warszawa, Poland
Bensch, F.;  Deutsches Zentrum für Luft- und Raumfahrt (DLR), Bonn, Germany
Bergin, E.;  University of Michigan, Ann Arbor, USA
Billebaud, F.;  Université de Bordeaux, Observatoire Aquitain des Sciences de l'Univers, CNRS, UMR 5804, Laboratoire d'Astrophysique de Bordeaux, France
Biver, N.;  LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France
Blake, G. A.;  JPL, California Institute of Technology, Pasadena, USA
Blommaert, J A D L;  Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Belgium
Cernicharo, J.;  Laboratorio de Astrofísica Molecular, CAB. INTA-CSIC, Spain
Courtin, R.;  LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France
Davis, G. R.;  Joint Astronomy Center, Hilo, USA
Decin, L.;  Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Belgium
Encrenaz, P.;  LERMA, Observatoire de Paris, and Univ. Pierre et Marie Curie, Paris, France
Gonzalez, A.;  Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Kidger, M.;  Herschel Science Centre, ESA Centre, Madrid, Spain
Naylor, D.;  University of Lethbridge, Canada
Portyankina, G.;  University of Bern, Switzerland
Schieder, R.;  University of Cologne, Germany
Sidher, S.;  Rutherford Appleton Laboratory, Oxfordshire, U K
Thomas, N.;  University of Bern, Switzerland
de Val-Borro, M.;  Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
Verdugo, E.;  Herschel Science Centre, ESA Centre, Madrid, Spain
Waelkens, C.;  Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Belgium
Walker, H.;  Rutherford Appleton Laboratory, Oxfordshire, U K
Aarts, Henri J.M.;  SRON, Groningen, The Netherlands
Comito, C.;  Max-Planck-Institut für Radioastronomie, Bonn, Germany
Kawamura, J. H.;  JPL, California Institute of Technology, Pasadena, USA
Maestrini, A.;  LERMA, Observatoire de Paris, and Univ. Pierre et Marie Curie, Paris, France
Peacocke, T.;  Experimental Physics Department, National University of Ireland Maynooth, Co. Kildare. Ireland
Teipen, R.;  University of Cologne, Germany
Tils, T.;  University of Cologne, Germany
Wildeman, K.;  SRON, Groningen, The Netherlands
More authors (44 more) Less
Language :
English
Title :
First results of Herschel-PACS observations of Neptune
Publication date :
01 July 2010
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
518
Pages :
L152
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/1006.0114
Available on ORBi :
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