First results of Herschel-PACS observations of Neptune

  title={First results of Herschel-PACS observations of Neptune},
  author={E. Lellouch and Paul Hartogh and Helmut Feuchtgruber and Bart K. Vandenbussche and Th. de Graauw and Roxana Moreno and Christopher J. Jarchow and Thibault Cavali'e and Glenn S. Orton and Marek Banaszkiewicz and Maria I. Blecka and Dominique Bockel'ee-Morvan and Jacques Crovisier and Thérèse Encrenaz and Trevor R. Fulton and M. Kuppers and Luisa Maria Lara and Dariusz C. Lis and Alexander S. Medvedev and Miriam Rengel and Hiroyuki Sagawa and Bruce M. Swinyard and Sławomira Szutowicz and Frank V. Bensch and Edwin A. Bergin and Francoise Billebaud and Nicolas Biver and Geoffrey A. Blake and Joris Blommaert and Jos{\'e} Cernicharo and R{\'e}gis Courtin and G. R. Davis and Leen Decin and Pierre J. Encrenaz and A. Gonz{\'a}lez and Emmanuel Jehin and Mark Richard Kidger and David Naylor and Ganna Portyankina and Rudolf T. Schieder and Sunil D. Sidher and Nicolas Thomas and Miguel de Val-Borro and Eva Verdugo and Christoffel Waelkens and H. Walker and Henri Aarts and Claudia Comito and Jonathan H. Kawamura and A. Maestrini and Tully Peacocke and Rafael Teipen and Thomas Tils and Klaas J. Wildeman},
  journal={Astronomy and Astrophysics},
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_4 at 120 μm. Numerous spectral features due to HD (R(0) and R(1)), H_(2)O, CH_4, 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… Expand

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