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Gaia Data Release 2. Processing the spectroscopic data

hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorSARTORETTI, P.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorKATZ, D.
hal.structure.identifierMullard Space Science Laboratory [MSSL]
dc.contributor.authorCROPPER, M.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorPANUZZO, P.
hal.structure.identifierMullard Space Science Laboratory [MSSL]
dc.contributor.authorSEABROKE, G. M.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorVIALA, Y.
hal.structure.identifierMullard Space Science Laboratory [MSSL]
dc.contributor.authorBENSON, K.
hal.structure.identifierRoyal Observatory of Belgium = Observatoire Royal de Belgique [ROB]
dc.contributor.authorBLOMME, R.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorJASNIEWICZ, G.
hal.structure.identifierCentre National d'Études Spatiales [Toulouse] [CNES]
dc.contributor.authorJEAN-ANTOINE, A.
hal.structure.identifierMullard Space Science Laboratory [MSSL]
dc.contributor.authorHUCKLE, H.
hal.structure.identifierMullard Space Science Laboratory [MSSL]
dc.contributor.authorSMITH, M.
dc.contributor.authorBAKER, S.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorCRIFO, F.
hal.structure.identifierCentre de Recherche en Astronomie Astrophysique et Géophysique [CRAAG]
hal.structure.identifierInstitut d'Astrophysique et de Géophysique [Liège]
dc.contributor.authorDAMERDJI, Y.
hal.structure.identifierLittoral, Environnement, Télédétection, Géomatique [LETG - Nantes]
dc.contributor.authorDAVID, M.
hal.structure.identifierMullard Space Science Laboratory [MSSL]
dc.contributor.authorDOLDING, C.
hal.structure.identifierRoyal Observatory of Belgium = Observatoire Royal de Belgique [ROB]
dc.contributor.authorFRÉMAT, Y.
hal.structure.identifierInstitut d'Astrophysique et de Géophysique [Liège]
dc.contributor.authorGOSSET, E.
hal.structure.identifierThales Services
dc.contributor.authorGUERRIER, A.
hal.structure.identifierUniversité de Genève = University of Geneva [UNIGE]
dc.contributor.authorGUY, L. P.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorHAIGRON, R.
hal.structure.identifierLeibniz Institute for Astrophysics Potsdam [AIP]
dc.contributor.authorJANSSEN, K.
dc.contributor.authorMARCHAL, O.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorPLUM, G.
hal.structure.identifierM2A 2018
dc.contributor.authorSOUBIRAN, C.
hal.structure.identifierJoseph Louis LAGRANGE [LAGRANGE]
dc.contributor.authorTHÉVENIN, F.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorAJAJ, M.
hal.structure.identifierMullard Space Science Laboratory [MSSL]
dc.contributor.authorALLENDE PRIETO, C.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorBABUSIAUX, C.
hal.structure.identifierMax-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
dc.contributor.authorBOUDREAULT, S.
hal.structure.identifierUnidad de Astronomia
dc.contributor.authorCHEMIN, L.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorDELLE LUCHE, C.
hal.structure.identifierATOS for CNES
dc.contributor.authorFABRE, C.
hal.structure.identifierMax Planck Institute for Extraterrestrial Physics [MPE]
dc.contributor.authorGUEGUEN, A.
dc.contributor.authorHAMBLY, N. C.
hal.structure.identifierThales Services
dc.contributor.authorLASNE, Y.
hal.structure.identifierSystèmes de Référence Temps Espace [SYRTE]
dc.contributor.authorMEYNADIER, F.
hal.structure.identifierCentre National d'Études Spatiales [Toulouse] [CNES]
dc.contributor.authorPAILLER, F.
hal.structure.identifierCentre National d'Études Spatiales [Toulouse] [CNES]
dc.contributor.authorPANEM, C.
hal.structure.identifierCentre National d'Études Spatiales [Toulouse] [CNES]
dc.contributor.authorRICLET, F.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorROYER, F.
hal.structure.identifierThales Services
dc.contributor.authorTAURAN, G.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorZURBACH, C.
hal.structure.identifierUniversity of Ljubljana
dc.contributor.authorZWITTER, T.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorARENOU, F.
dc.contributor.authorGOMEZ, A.
dc.contributor.authorLEMAITRE, V.
hal.structure.identifierLaboratoire des Matériaux, Surfaces et Procédés pour la Catalyse [LMSPC]
dc.contributor.authorLECLERC, N.
dc.contributor.authorMOREL, T.
dc.contributor.authorMUNARI, U.
hal.structure.identifierGalaxies, Etoiles, Physique, Instrumentation [GEPI]
dc.contributor.authorTURON, C.
dc.contributor.authorŽERJAL, M.
dc.date.issued2018
dc.identifier.issn0004-6361
dc.description.abstractEnContext. The Gaia Data Release 2 (DR2) contains the first release of radial velocities complementing the kinematic data of a sample of about 7 million relatively bright, late-type stars.Aims. This paper provides a detailed description of the Gaia spectroscopic data processing pipeline, and of the approach adopted to derive the radial velocities presented in DR2.Methods. The pipeline must perform four main tasks: (i) clean and reduce the spectra observed with the Radial Velocity Spectrometer (RVS); (ii) calibrate the RVS instrument, including wavelength, straylight, line-spread function, bias non-uniformity, and photometric zeropoint; (iii) extract the radial velocities; and (iv) verify the accuracy and precision of the results. The radial velocity of a star is obtained through a fit of the RVS spectrum relative to an appropriate synthetic template spectrum. An additional task of the spectroscopic pipeline was to provide first-order estimates of the stellar atmospheric parameters required to select such template spectra. We describe the pipeline features and present the detailed calibration algorithms and software solutions we used to produce the radial velocities published in DR2.Results. The spectroscopic processing pipeline produced median radial velocities for Gaia stars with narrow-band near-IR magnitude GRVS ≤ 12 (i.e. brighter than V ~ 13). Stars identified as double-lined spectroscopic binaries were removed from the pipeline, while variable stars, single-lined, and non-detected double-lined spectroscopic binaries were treated as single stars. The scatter in radial velocity among different observations of a same star, also published in Gaia DR2, provides information about radial velocity variability. For the hottest (Teff ≥ 7000 K) and coolest (Teff ≤ 3500 K) stars, the accuracy and precision of the stellar parameter estimates are not sufficient to allow selection of appropriate templates. The radial velocities obtained for these stars were removed from DR2. The pipeline also provides a first-order estimate of the performance obtained. The overall accuracy of radial velocity measurements is around ~200–300 m s−1, and the overall precision is ~1 km s−1; it reaches ~200 m s−1 for the brightest stars.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.entechniques: spectroscopic
dc.subject.encatalogs
dc.subject.entechniques: radial velocities
dc.subject.ensurveys
dc.subject.enmethods: data analysis
dc.title.enGaia Data Release 2. Processing the spectroscopic data
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201832836
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv1804.09371
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageA6
bordeaux.volume616
bordeaux.peerReviewedoui
hal.identifierhal-03004490
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03004490v1
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