Gaia spectroscopy: processing, performances and scientific returns

¹ GÉPI, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France
² University College London, Mullard Space Science Laboratory, Holmbury St Mary, Dorking RH5 6NT, UK
³ Centre National d’Études Spatiales, 18 avenue Edouard Belin, 31401 Toulouse Cedex 9, France
⁴ Instituto de Astrofísica de Canarias, 38025 La Laguna, Tenerife, Spain
⁵ IMCCE, Observatoire de Paris, CNRS, UPMC, Université Lille 1, 77 avenue Denfert Rochereau, 75014 Paris, France
⁶ Cassiopée, Observatoire de la Côte d’Azur, CNRS, BP. 4229, 06304 Nice Cedex 4, France
⁷ Royal Observatory of Belgium ; Ringlaan 3, 1180 Brussels, Belgium
⁸ Laboratoire d’Astrophysique de Bordeaux, CNRS, Université Bordeaux 1, 2 rue de l’Observatoire, BP. 89, 33271 Floirac Cedex, France
⁹ Astrophysical Institute, University of Liège, allée du 6 Août 17, 4000 Liège, Belgium
¹⁰ University of Antwerp, Middelheimlaan, 2020 Antwerpen, Belgium
¹¹ Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
¹² Observatoire Astronomique de l’Université de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
¹³ E2V centre for electronic imaging, Open University, UK
¹⁴ GRAAL, CNRS, Université de Montpellier II, place Eugène Bataillon, CC 72, 34095 Montpellier Cedex 05, France
¹⁵ Zentrum für Astronomie der Universität Heidelberg, Landessternwarte; Königstuhl 12, 69117 Heidelberg, Germany

Abstract

During the five years of the mission, the Gaia spectrograph, the Radial Velocity Spectrometer (RVS) will repeatedly survey the celestial sphere down to magnitude V ~ 17–18. This talk presents: (i) the system which is currently developed within the Gaia Data Processing and Analysis Consortium (DPAC) to reduce and calibrate the spectra and to derive the radial and rotational velocities, (ii) the RVS expected performances and (iii) scientific returns.