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Gaia Data Release 2. Summary of the contents and survey properties

Gaia Collaboration A. Brown A. Vallenari T. Prusti 1 J. de Bruijne C. Babusiaux 2, 3 C. Bailer-Jones M. Biermann D. Evans L. Eyer 4 F. Jansen 5 C. Jordi S. Klioner U. Lammers L. Lindegren X. Luri 6 F. Mignard 7 C. Panem D. Pourbaix 8 S. Randich P. Sartoretti 2 H. Siddiqui 9 C. Soubiran 10 F. van Leeuwen A. Walton F. Arenou 2 U. Bastian 11 M. Cropper R. Drimmel D. Katz 2 M. Lattanzi 12 J. Bakker 13 C. Cacciari 14 J. Castañeda L. Chaoul N. Cheek F. de Angeli 15 C. Fabricius 16 R. Guerra 17 B. Holl 18 E. Masana 19 R. Messineo N. Mowlavi K. Nienartowicz P. Panuzzo 20, 2 J. Portell M. Riello M. Seabroke P. Tanga 7 F. Thevenin 7 G. Gracia-Abril G. Comoretto 21 M. Garcia-Reinaldos D. Teyssier M. Altmann 22 R. Andrae M. Audard 23 I. Bellas-Velidis K. Benson Jérôme Berthier 24 R. Blomme 25 P. Burgess 15 G. Busso 15 B. Carry 24, 7 A. Cellino 26 G. Clementini 27 M. Clotet O. Creevey 7 M. David J. de Ridder 20 L. Delchambre A. Dell’oro C. Ducourant 10 J. Hernandez 28 M. Fouesneau Y. Frémat 2 L. Galluccio 7 M. García-Torres J. González-Núñez J. González-Vidal E. Gosset 29 P. Guy 30 J. Halbwachs C. Hambly D. Harrison D. Hestroffer 24 T. Hodgkin A. Hutton Gérard Jasniewicz 31 A. Jean-Antoine-Piccolo S. Jordan 32 J. Korn A. Krone-Martins 33 C. Lanza T. Lebzelter W. Löffler M. Manteiga M. Marrese J. Martín-Fleitas A. Moitinho 34 A. Mor K. Muinonen 35 J. Osinde E. Pancino 36 T. Pauwels 25 J. Petit 37 A. Recio-Blanco 7 J. Richards L. Rimoldini C. Robin M. Sarro C. Siopis M. Smith A. Sozzetti M. Süveges J. Torra W. van Reeven U. Abbas 38 A. Abreu Aramburu S. Accart C. Aerts 39 G. Altavilla M. Álvarez R. Alvarez J. Alves R. Anderson H. Andrei 22 E. Anglada Varela E. Antiche T. Antoja B. Arcay T. Astraatmadja 40 N. Bach 41 S. Baker L. Balaguer-Nunez 42 P. Balm C. Barache 22 C. Barata 43 D. Barbato F. Barblan S. Barklem D. Barrado 44 M. Barros M. Barstow 45 S. Bartholomé Muñoz J. Bassilana U. Becciani M. Bellazzini A. Berihuete Stefano Bertone 22 L. Bianchi 46 O. Bienaymé 47 S. Blanco-Cuaresma 48 T. Boch C. Boeche A. Bombrun 49 R. Borrachero D. Bossini S. Bouquillon 22 G. Bourda 10 A. Bragaglia L. Bramante M. Breddels A. Bressan 50 N. Brouillet 51 T. Brüsemeister E. Brugaletta B. Bucciarelli A. Burlacu D. Busonero A. Butkevich R. Buzzi E. Caffau 2 R. Cancelliere G. Cannizzaro T. Cantat-Gaudin R. Carballo T. Carlucci 22 J. Carrasco 52 L. Casamiquela 10 M. Castellani 53 A. Castro-Ginard P. Charlot 10 L. Chemin A. Chiavassa 7 G. Cocozza G. Costigan S. Cowell 15 F. Crifo 2 M. Crosta C. Crowley J. Cuypers† C. Dafonte Y. Damerdji 54 A. Dapergolas P. David 24 P. de Laverny 7 F. de Luise 55 R. de March D. Martino 56 R. de Souza A. de Torres J. Debosscher 57 E. del Pozo M. Delbò 7 A. Delgado 58 H. Delgado P. Di Matteo 2 S. Diakite 59 C. Diener E. Distefano C. Dolding P. Drazinos J. Duran 60 B. Edvardsson 61 H. Enke K. Eriksson 61 P. Esquej G. Eynard Bontemps C. Fabre 62 M. Fabrizio 63 S. Faigler J. Falcão M. Farràs Casas L. Federici 64 G. Fedorets P. Fernique 65 F. Figueras 66 F. Filippi 67 K. Findeisen 2 A. Fonti E. Fraile M. Fraser 68 B. Frézouls M. Gai 26 S. Galleti D. Garabato F. García-Sedano A. Garofalo 69 N. Garralda A. Gavel P. Gavras 2 J. Gerssen R. Geyer P. Giacobbe G. Gilmore S. Girona G. Giuffrida F. Glass M. Gomes M. Granvik A. Gueguen 70, 2 A. Guerrier 71 J. Guiraud 72 R. Gutiérrez-Sánchez R. Haigron 2 D. Hatzidimitriou 73 M. Hauser M. Haywood 2 U. Heiter 61 A. Helmi 74 J. Heu 2 T. Hilger D. Hobbs W. Hofmann G. Holland H. Huckle A. Hypki V. Icardi K. Janßen G. Jevardat de Fombelle G. Jonker L. Juhasz 75 F. Julbe A. Karampelas A. Kewley J. Klar A. Kochoska R. Kohley 76 K. Kolenberg M. Kontizas E. Kontizas S. Koposov G. Kordopatis 7 Z. Kostrzewa-Rutkowska P. Koubsky S. Lambert 22 A. Lanza Y. Lasne 77 J. Lavigne Y. Le Fustec C. Le Poncin-Lafitte 78 Y. Lebreton 2, 79 S. Leccia N. Leclerc 80, 2 I. Lecoeur-Taibi H. Lenhardt F. Leroux S. Liao 81 E. Licata H. Lindstrøm T. Lister E. Livanou A. Lobel 25 M. López S. Managau G. Mann 82 G. Mantelet 83 O. Marchal 2 J. Marchant 84 M. Marconi S. Marinoni G. Marschalkó D. J. Marshall 85 M. Martino G. Marton 86 N. Mary 87 D. Massari G. Matijevič T. Mazeh 88 J. Mcmillan S. Messina D. Michalik R. Millar 89 D. Molina R. Molinaro 90 L. Molnar 91 P. Montegriffo R. Mor T. Sagristà Sellés R. Morbidelli T. Morel D. Morris 92 A. Mulone T. Muraveva I. Musella G. Nelemans L. Nicastro L. Noval W. O’mullane C. Ordenovic 7 D. Ordóñez-Blanco P. Osborne C. Pagani I. Pagano F. Pailler 93 H. Palacin L. Palaversa A. Panahi M. Pawlak M. Piersimoni F. Pineau 94 E. Plachy G. Plum 2 E. Poggio E. Poujoulet A. Prša L. Pulone E. Racero S. Ragaini N. Rambaux 24 M. Ramos-Lerate S. Regibo C. Reyle 95 F. Riclet V. Ripepi 96 A. Riva 97 A. Rivard G. Rixon 15 T. Roegiers M. Roelens 98 M. Romero-Gomez 99 N. Rowell F. Royer 2 L. Ruiz-Dern 71, 2 G. Sadowski 100 J. Sahlmann J. Salgado 101 E. Salguero N. Sanna T. Santana-Ros 102 M. Sarasso H. Savietto M. Schultheis 7 E. Sciacca M. Segol 103 C. Segovia D. Segransan 48 C. Shih 2 L. Siltala A. Silva R. Smart 26 W. Smith E. Solano 104 F. Solitro R. Sordo S. Soria Nieto J. Souchay 22 A. Spagna F. Spoto 24 U. Stampa A. Steele 105 H. Steidelmüller C. Stephenson H. Stoev F. Suess J. Surdej 106 L. Szabados 107 E. Szegedi-Elek D. Tapiador F. Taris 22 G. Tauran M. Taylor R. Teixeira 108 D. Terrett P. Teyssandier 22 W. Thuillot 24 A. Titarenko 7 F. Torra Clotet C. Turon 2 A. Ulla E. Utrilla S. Uzzi M. Vaillant 109 G. Valentini 110 V. Valette 111 A. van Elteren E. van Hemelryck M. van Leeuwen M. Vaschetto A. Vecchiato 112 J. Veljanoski Y. Viala 2 D. Vicente 113 S. Vogt 114 C. von Essen H. Voss V. Votruba S. Voutsinas G. Walmsley M. Weiler 115 O. Wertz T. Wevers 116 Ł. Wyrzykowski A. Yoldas 15 M. Žerjal H. Ziaeepour 117 J. Zorec 118 S. Zschocke 119 S. Zucker 120 C. Zurbach 31 T. Zwitter
10 M2A 2018
LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
51 FORMATION STELLAIRE 2018
LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
111 EES - Ecologie, Evolution, Symbiose
EBI - Ecologie et biologie des interactions
112 Astrometry
OATo - INAF - Osservatorio Astrofisico di Torino
Abstract : Context. We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources brighter than magnitude 21. In addition epoch astrometry and photometry are provided for a modest sample of minor planets in the solar system. Aims: A summary of the contents of Gaia DR2 is presented, accompanied by a discussion on the differences with respect to Gaia DR1 and an overview of the main limitations which are still present in the survey. Recommendations are made on the responsible use of Gaia DR2 results. Methods: The raw data collected with the Gaia instruments during the first 22 months of the mission have been processed by the Gaia Data Processing and Analysis Consortium (DPAC) and turned into this second data release, which represents a major advance with respect to Gaia DR1 in terms of completeness, performance, and richness of the data products. Results: Gaia DR2 contains celestial positions and the apparent brightness in G for approximately 1.7 billion sources. For 1.3 billion of those sources, parallaxes and proper motions are in addition available. The sample of sources for which variability information is provided is expanded to 0.5 million stars. This data release contains four new elements: broad-band colour information in the form of the apparent brightness in the GBP (330-680 nm) and GRP (630-1050 nm) bands is available for 1.4 billion sources; median radial velocities for some 7 million sources are presented; for between 77 and 161 million sources estimates are provided of the stellar effective temperature, extinction, reddening, and radius and luminosity; and for a pre-selected list of 14 000 minor planets in the solar system epoch astrometry and photometry are presented. Finally, Gaia DR2 also represents a new materialisation of the celestial reference frame in the optical, the Gaia-CRF2, which is the first optical reference frame based solely on extragalactic sources. There are notable changes in the photometric system and the catalogue source list with respect to Gaia DR1, and we stress the need to consider the two data releases as independent. Conclusions: Gaia DR2 represents a major achievement for the Gaia mission, delivering on the long standing promise to provide parallaxes and proper motions for over 1 billion stars, and representing a first step in the availability of complementary radial velocity and source astrophysical information for a sample of stars in the Gaia survey which covers a very substantial fraction of the volume of our galaxy.
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Gaia Collaboration, A. Brown, A. Vallenari, T. Prusti, J. de Bruijne, et al.. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy and Astrophysics - A&A, EDP Sciences, 2018, 616, pp.id.A1. ⟨10.1051/0004-6361/201833051⟩. ⟨hal-01867401⟩

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