Euclid: Quick Data Release (Q1) – A photometric search for ultracool dwarfs in the Euclid Deep Fields

Euclid: Quick Data Release (Q1) – A photometric search for ultracool dwarfs in the Euclid Deep Fields
M. v{Z}erjal (Instituto de Astrof’isica de Canarias, E-38205 La Laguna, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain), C. Dominguez-Tagle (Instituto de Astrof’isica de Canarias, E-38205 La Laguna, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain), N. Vitas (Instituto de Astrof’isica de Canarias, E-38205 La Laguna, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain), N. Sedighi (Instituto de Astrof’isica de Canarias, E-38205 La Laguna, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain), E. L. Mart’in (Instituto de Astrof’isica de Canarias, E-38205 La Laguna, Tenerife, Spain, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain), M. R. Zapatero Osorio (Centro de Astrobiolog’ia), J. Olivares (Departamento de Inteligencia Artificial, Universidad Nacional de Educaci’on a Distancia), S. Mu~noz Torres (Instituto de Astrof’isica de Canarias, E-38205 La Laguna, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain), S. Tsilia (Instituto de Astrof’isica de Canarias, E-38205 La Laguna, Tenerife, Spain, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain), J. -Y. Zhang (Instituto de Astrof’isica de Canarias, E-38205 La Laguna, Tenerife, Spain, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain), D. Barrado (Centro de Astrobiolog’ia), V. J. S. B’ejar (Instituto de Astrof’isica de Canarias, E-38205 La Laguna, Tenerife, Spain, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain), H. Bouy (Laboratoire d’Astrophysique de Bordeaux, CNRS and Universit’e de Bordeaux, All’ee Geoffroy St. Hilaire, 33165 Pessac, France, Institut universitaire de France), A. Burgasser (Department of Astronomy & Astrophysics, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA), P. Cruz (Centro de Astrobiolog’ia), N. Lodieu (Instituto de Astrof’isica de Canarias, E-38205 La Laguna, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain), P. Mas Buitrago (Centro de Astrobiolog’ia), N. Phan-Bao (Department of Physics, International University, Ho Chi Minh City, Vietnam, Vietnam National University, Ho Chi Minh City, Vietnam), E. Solano (Centro de Astrobiolog’ia), R. Tata (Ohio University, Physics & Astronomy Department,1 Ohio University, Athens, OH 45701, USA), B. Goldman (International Space University, 1 rue Jean-Dominique Cassini, 67400 Illkirch-Graffenstaden, France, Universit’e de Strasbourg, CNRS, Observatoire astronomique de Strasbourg, UMR 7550, 67000 Strasbourg, France), A. Mohandasan (Universite Marie et Louis Pasteur, CNRS, Observatoire des Sciences de l’Univers THETA Franche-Comte Bourgogne, Institut UTINAM, Observatoire de Besanc{c}on, BP 1615, 25010 Besanc{c}on Cedex, France), C. Reyl’e (Universite Marie et Louis Pasteur, CNRS, Observatoire des Sciences de l’Univers THETA Franche-Comte Bourgogne, Institut UTINAM, Observatoire de Besanc{c}on, BP 1615, 25010 Besanc{c}on Cedex, France), R. L. Smart (INAF-Osservatorio Astrofisico di Torino, Via Osservatorio 20, 10025 Pino Torinese, Department of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK), N. Aghanim (Universit’e Paris-Saclay, CNRS, Institut d’astrophysique spatiale, 91405, Orsay, France), B. Altieri (ESAC/ESA, Camino Bajo del Castillo, s/n., Urb. Villafranca del Castillo, 28692 Villanueva de la Ca~nada, Madrid, Spain), A. Amara (School of Mathematics and Physics, University of Surrey, Guildford, Surrey, GU2 7XH, UK), S. Andreon (INAF-Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano, Italy), N. Auricchio (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy), C. Baccigalupi (IFPU, Institute for Fundamental Physics of the Universe, via Beirut 2, 34151 Trieste, Italy, INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy, INFN, Sezione di Trieste, Via Valerio 2, 34127 Trieste TS, Italy, SISSA, International School for Advanced Studies, Via Bonomea 265, 34136 Trieste TS, Italy), M. Baldi (Dipartimento di Fisica e Astronomia, Universit`a di Bologna, Via Gobetti 93/2, 40129 Bologna, Italy, INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy, INFN-Sezione di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy), A. Balestra (INAF-Osservatorio Astronomico di Padova, Via dell’Osservatorio 5, 35122 Padova, Italy), S. Bardelli (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy), P. Battaglia (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy), A. Biviano (INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy, IFPU, Institute for Fundamental Physics of the Universe, via Beirut 2, 34151 Trieste, Italy), A. Bonchi (Space Science Data Center, Italian Space Agency, via del Politecnico snc, 00133 Roma, Italy), E. Branchini (Dipartimento di Fisica, Universit`a di Genova, Via Dodecaneso 33, 16146, Genova, Italy, INFN-Sezione di Genova, Via Dodecaneso 33, 16146, Genova, Italy, INAF-Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano, Italy), M. Brescia (Department of Physics "E. Pancini", University Federico II, Via Cinthia 6, 80126, Napoli, Italy, INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy), J. Brinchmann (Instituto de Astrof’isica e Ci^encias do Espac{c}o, Universidade do Porto, CAUP, Rua das Estrelas, PT4150-762 Porto, Portugal, Faculdade de Ci^encias da Universidade do Porto, Rua do Campo de Alegre, 4150-007 Porto, Portugal), S. Camera (Dipartimento di Fisica, Universit`a degli Studi di Torino, Via P. Giuria 1, 10125 Torino, Italy, INFN-Sezione di Torino, Via P. Giuria 1, 10125 Torino, Italy, INAF-Osservatorio Astrofisico di Torino, Via Osservatorio 20, 10025 Pino Torinese), G. Ca~nas-Herrera (European Space Agency/ESTEC, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands, Institute Lorentz, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands, Leiden Observatory, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands), V. Capobianco (INAF-Osservatorio Astrofisico di Torino, Via Osservatorio 20, 10025 Pino Torinese), C. Carbone (INAF-IASF Milano, Via Alfonso Corti 12, 20133 Milano, Italy), J. Carretero (Centro de Investigaciones Energ’eticas, Medioambientales y Tecnol’ogicas, Port d’Informaci’o Cient’ifica, Campus UAB, C. Albareda s/n, 08193 Bellaterra), S. Casas (Institute for Theoretical Particle Physics and Cosmology), M. Castellano (INAF-Osservatorio Astronomico di Roma, Via Frascati 33, 00078 Monteporzio Catone, Italy), G. Castignani (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy), S. Cavuoti (INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy, INFN section of Naples, Via Cinthia 6, 80126, Napoli, Italy), K. C. Chambers (Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA), A. Cimatti (Dipartimento di Fisica e Astronomia "Augusto Righi" – Alma Mater Studiorum Universit`a di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy), C. Colodro-Conde (Instituto de Astrof’isica de Canarias, E-38205 La Laguna, Tenerife, Spain), G. Congedo (Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK), C. J. Conselice (Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK), L. Conversi (European Space Agency/ESRIN, Largo Galileo Galilei 1, 00044 Frascati, Roma, Italy, ESAC/ESA, Camino Bajo del Castillo, s/n., Urb. Villafranca del Castillo, 28692 Villanueva de la Ca~nada, Madrid, Spain), Y. Copin (Universit’e Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822, Villeurbanne, F-69100, France), F. Courbin (Institut de Ci`encies del Cosmos, Instituci’o Catalana de Recerca i Estudis Avanc{c}ats), H. M. Courtois (UCB Lyon 1, CNRS/IN2P3, IUF, IP2I Lyon, 4 rue Enrico Fermi, 69622 Villeurbanne, France), M. Cropper (Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK), J. -G. Cuby (Canada-France-Hawaii Telescope, 65-1238 Mamalahoa Hwy, Kamuela, HI 96743, USA, Aix-Marseille Universit’e, CNRS, CNES, LAM, Marseille, France), A. Da Silva (Departamento de F’isica, Faculdade de Ci^encias, Universidade de Lisboa, Edif’icio C8, Campo Grande, PT1749-016 Lisboa, Portugal, Instituto de Astrof’isica e Ci^encias do Espac{c}o, Faculdade de Ci^encias, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal), H. Degaudenzi (Department of Astronomy, University of Geneva, ch. d’Ecogia 16, 1290 Versoix, Switzerland), G. De Lucia (INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy), C. Dolding (Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK), H. Dole (Universit’e Paris-Saclay, CNRS, Institut d’astrophysique spatiale, 91405, Orsay, France), M. Douspis (Universit’e Paris-Saclay, CNRS, Institut d’astrophysique spatiale, 91405, Orsay, France), F. Dubath (Department of Astronomy, University of Geneva, ch. d’Ecogia 16, 1290 Versoix, Switzerland), X. Dupac (ESAC/ESA, Camino Bajo del Castillo, s/n., Urb. Villafranca del Castillo, 28692 Villanueva de la Ca~nada, Madrid, Spain), S. Dusini (INFN-Padova, Via Marzolo 8, 35131 Padova, Italy), S. Escoffier (Aix-Marseille Universit’e, CNRS/IN2P3, CPPM, Marseille, France), M. Farina (INAF-Istituto di Astrofisica e Planetologia Spaziali, via del Fosso del Cavaliere, 100, 00100 Roma, Italy), F. Faustini (INAF-Osservatorio Astronomico di Roma, Via Frascati 33, 00078 Monteporzio Catone, Italy, Space Science Data Center, Italian Space Agency, via del Politecnico snc, 00133 Roma, Italy), S. Ferriol (Universit’e Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822, Villeurbanne, F-69100, France), S. Fotopoulou (School of Physics, HH Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK), M. Frailis (INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy), E. Franceschi (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy), S. Galeotta (INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy), K. George (Universit"ats-Sternwarte M"unchen, Fakult"at f"ur Physik, Ludwig-Maximilians-Universit"at M"unchen, Scheinerstrasse 1, 81679 M"unchen, Germany), B. Gillis (Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK), C. Giocoli (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy, INFN-Sezione di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy), P. G’omez-Alvarez (FRACTAL S.L.N.E., calle Tulip’an 2, Portal 13 1A, 28231, Las Rozas de Madrid, Spain, ESAC/ESA, Camino Bajo del Castillo, s/n., Urb. Villafranca del Castillo, 28692 Villanueva de la Ca~nada, Madrid, Spain), J. Gracia-Carpio (Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, 85748 Garching, Germany), B. R. Granett (INAF-Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano, Italy), A. Grazian (INAF-Osservatorio Astronomico di Padova, Via dell’Osservatorio 5, 35122 Padova, Italy), F. Grupp (Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, 85748 Garching, Germany, Universit"ats-Sternwarte M"unchen, Fakult"at f"ur Physik, Ludwig-Maximilians-Universit"at M"unchen, Scheinerstrasse 1, 81679 M"unchen, Germany), S. V. H. Haugan (Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, 0315 Oslo, Norway), J. Hoar (ESAC/ESA, Camino Bajo del Castillo, s/n., Urb. Villafranca del Castillo, 28692 Villanueva de la Ca~nada, Madrid, Spain), W. Holmes (Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA), F. Hormuth (Felix Hormuth Engineering, Goethestr. 17, 69181 Leimen, Germany), A. Hornstrup (Technical University of Denmark, Elektrovej 327, 2800 Kgs. Lyngby, Denmark, Cosmic Dawn Center), K. Jahnke (Max-Planck-Institut f"ur Astronomie, K"onigstuhl 17, 69117 Heidelberg, Germany), M. Jhabvala (NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA), E. Keih"anen (Department of Physics and Helsinki Institute of Physics, Gustaf H"allstr"omin katu 2, University of Helsinki, 00014 Helsinki, Finland), S. Kermiche (Aix-Marseille Universit’e, CNRS/IN2P3, CPPM, Marseille, France), A. Kiessling (Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA), B. Kubik (Universit’e Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822, Villeurbanne, F-69100, France), K. Kuijken (Leiden Observatory, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands), M. K"ummel (Universit"ats-Sternwarte M"unchen, Fakult"at f"ur Physik, Ludwig-Maximilians-Universit"at M"unchen, Scheinerstrasse 1, 81679 M"unchen, Germany), M. Kunz (Universit’e de Gen`eve, D’epartement de Physique Th’eorique and Centre for Astroparticle Physics, 24 quai Ernest-Ansermet, CH-1211 Gen`eve 4, Switzerland), H. Kurki-Suonio (Department of Physics, P.O. Box 64, University of Helsinki, 00014 Helsinki, Finland, Helsinki Institute of Physics, Gustaf H"allstr"omin katu 2, University of Helsinki, 00014 Helsinki, Finland), Q. Le Boulc’h (Centre de Calcul de l’IN2P3/CNRS, 21 avenue Pierre de Coubertin 69627 Villeurbanne Cedex, France), A. M. C. Le Brun (Laboratoire d’etude de l’Univers et des phenomenes eXtremes, Observatoire de Paris, Universit’e PSL, Sorbonne Universit’e, CNRS, 92190 Meudon, France), S. Ligori (INAF-Osservatorio Astrofisico di Torino, Via Osservatorio 20, 10025 Pino Torinese), P. B. Lilje (Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, 0315 Oslo, Norway), V. Lindholm (Department of Physics, P.O. Box 64, University of Helsinki, 00014 Helsinki, Finland, Helsinki Institute of Physics, Gustaf H"allstr"omin katu 2, University of Helsinki, 00014 Helsinki, Finland), I. Lloro (SKAO, Jodrell Bank, Lower Withington, Macclesfield SK11 9FT, UK), G. Mainetti (Centre de Calcul de l’IN2P3/CNRS, 21 avenue Pierre de Coubertin 69627 Villeurbanne Cedex, France), D. Maino (Dipartimento di Fisica "Aldo Pontremoli", Universit`a degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy, INAF-IASF Milano, Via Alfonso Corti 12, 20133 Milano, Italy, INFN-Sezione di Milano, Via Celoria 16, 20133 Milano, Italy), E. Maiorano (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy), O. Mansutti (INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy), O. Marggraf (Universit"at Bonn, Argelander-Institut f"ur Astronomie, Auf dem H"ugel 71, 53121 Bonn, Germany), M. Martinelli (INAF-Osservatorio Astronomico di Roma, Via Frascati 33, 00078 Monteporzio Catone, Italy, INFN-Sezione di Roma, Piazzale Aldo Moro, 2 – c/o Dipartimento di Fisica, Edificio G. Marconi, 00185 Roma, Italy), N. Martinet (Aix-Marseille Universit’e, CNRS, CNES, LAM, Marseille, France), F. Marulli (Dipartimento di Fisica e Astronomia "Augusto Righi" – Alma Mater Studiorum Universit`a di Bologna, via Piero Gobetti 93/2, 40129 Bologna, Italy, INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy, INFN-Sezione di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy), R. Massey (Department of Physics, Institute for Computational Cosmology, Durham University, South Road, Durham, DH1 3LE, UK), E. Medinaceli (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy), S. Mei (Universit’e Paris Cit’e, CNRS, Astroparticule et Cosmologie, 75013 Paris, France, CNRS-UCB International Research Laboratory, Centre Pierre Bin’etruy, IRL2007, CPB-IN2P3, Berkeley, USA), Y. Mellier (Institut d’Astrophysique de Paris, 98bis Boulevard Arago, 75014, Paris, France, Institut d’Astrophysique de Paris, UMR 7095, CNRS, and Sorbonne Universit’e, 98 bis boulevard Arago, 75014 Paris, France), M. Meneghetti (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy, INFN-Sezione di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy), E. Merlin (INAF-Osservatorio Astronomico di Roma, Via Frascati 33, 00078 Monteporzio Catone, Italy), G. Meylan (Institute of Physics, Laboratory of Astrophysics, Ecole Polytechnique F’ed’erale de Lausanne), A. Mora (Aurora Technology for European Space Agency), M. Moresco (Dipartimento di Fisica e Astronomia "Augusto Righi" – Alma Mater Studiorum Universit`a di Bologna, via Piero Gobetti 93/2, 40129 Bologna, Italy, INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy), L. Moscardini (Dipartimento di Fisica e Astronomia "Augusto Righi" – Alma Mater Studiorum Universit`a di Bologna, via Piero Gobetti 93/2, 40129 Bologna, Italy, INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy, INFN-Sezione di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy), R. Nakajima (Universit"at Bonn, Argelander-Institut f"ur Astronomie, Auf dem H"ugel 71, 53121 Bonn, Germany), C. Neissner (Institut de F’isica d’Altes Energies, Port d’Informaci’o Cient’ifica, Campus UAB, C. Albareda s/n, 08193 Bellaterra), S. -M. Niemi (European Space Agency/ESTEC, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands), C. Padilla (Institut de F’isica d’Altes Energies), S. Paltani (Department of Astronomy, University of Geneva, ch. d’Ecogia 16, 1290 Versoix, Switzerland), F. Pasian (INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy), K. Pedersen (DARK, Niels Bohr Institute, University of Copenhagen, Jagtvej 155, 2200 Copenhagen, Denmark), W. J. Percival (Waterloo Centre for Astrophysics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada, Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada, Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada), V. Pettorino (European Space Agency/ESTEC, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands), S. Pires (Universit’e Paris-Saclay, Universit’e Paris Cit’e, CEA, CNRS, AIM, 91191, Gif-sur-Yvette, France), G. Polenta (Space Science Data Center, Italian Space Agency, via del Politecnico snc, 00133 Roma, Italy), M. Poncet (Centre National d’Etudes Spatiales — Centre spatial de Toulouse, 18 avenue Edouard Belin, 31401 Toulouse Cedex 9, France), L. A. Popa (Institute of Space Science, Str. Atomistilor, nr. 409 Mu{a}gurele, Ilfov, 077125, Romania), L. Pozzetti (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy), F. Raison (Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, 85748 Garching, Germany), R. Rebolo (Instituto de Astrof’isica de Canarias, E-38205 La Laguna, Tenerife, Spain, Consejo Superior de Investigaciones Cientificas, Calle Serrano 117, 28006 Madrid, Spain, Universidad de La Laguna, Dpto. Astrof’i sica, E-38206 La Laguna, Tenerife, Spain), A. Renzi (Dipartimento di Fisica e Astronomia "G. Galilei", Universit`a di Padova, Via Marzolo 8, 35131 Padova, Italy, INFN-Padova, Via Marzolo 8, 35131 Padova, Italy), J. Rhodes (Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA), G. Riccio (INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy), E. Romelli (INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy), M. Roncarelli (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy), R. Saglia (Universit"ats-Sternwarte M"unchen, Fakult"at f"ur Physik, Ludwig-Maximilians-Universit"at M"unchen, Scheinerstrasse 1, 81679 M"unchen, Germany, Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, 85748 Garching, Germany), Z. Sakr (Institut f"ur Theoretische Physik, University of Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany, Institut de Recherche en Astrophysique et Plan’etologie, Universit’e St Joseph, Faculty of Sciences, Beirut, Lebanon), D. Sapone (Departamento de F’isica, FCFM, Universidad de Chile, Blanco Encalada 2008, Santiago, Chile), B. Sartoris (Universit"ats-Sternwarte M"unchen, Fakult"at f"ur Physik, Ludwig-Maximilians-Universit"at M"unchen, Scheinerstrasse 1, 81679 M"unchen, Germany, INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy), J. A. Schewtschenko (Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK), M. Schirmer (Max-Planck-Institut f"ur Astronomie, K"onigstuhl 17, 69117 Heidelberg, Germany), P. Schneider (Universit"at Bonn, Argelander-Institut f"ur Astronomie, Auf dem H"ugel 71, 53121 Bonn, Germany), A. Secroun (Aix-Marseille Universit’e, CNRS/IN2P3, CPPM, Marseille, France), G. Seidel (Max-Planck-Institut f"ur Astronomie, K"onigstuhl 17, 69117 Heidelberg, Germany), M. Seiffert (Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA), S. Serrano (Institut d’Estudis Espacials de Catalunya, Satlantis, University Science Park, Sede Bld 48940, Leioa-Bilbao, Spain, Institute of Space Sciences), P. Simon (Universit"at Bonn, Argelander-Institut f"ur Astronomie, Auf dem H"ugel 71, 53121 Bonn, Germany), C. Sirignano (Dipartimento di Fisica e Astronomia "G. Galilei", Universit`a di Padova, Via Marzolo 8, 35131 Padova, Italy, INFN-Padova, Via Marzolo 8, 35131 Padova, Italy), G. Sirri (INFN-Sezione di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy), L. Stanco (INFN-Padova, Via Marzolo 8, 35131 Padova, Italy), J. Steinwagner (Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, 85748 Garching, Germany), P. Tallada-Cresp’i (Centro de Investigaciones Energ’eticas, Medioambientales y Tecnol’ogicas, Port d’Informaci’o Cient’ifica, Campus UAB, C. Albareda s/n, 08193 Bellaterra), A. N. Taylor (Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK), I. Tereno (Departamento de F’isica, Faculdade de Ci^encias, Universidade de Lisboa, Edif’icio C8, Campo Grande, PT1749-016 Lisboa, Portugal, Instituto de Astrof’isica e Ci^encias do Espac{c}o, Faculdade de Ci^encias, Universidade de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal), S. Toft (Cosmic Dawn Center, Niels Bohr Institute, University of Copenhagen, Jagtvej 128, 2200 Copenhagen, Denmark), R. Toledo-Moreo (Universidad Polit’ecnica de Cartagena, Departamento de Electr’onica y Tecnolog’ia de Computadoras, Plaza del Hospital 1, 30202 Cartagena, Spain), F. Torradeflot (Port d’Informaci’o Cient’ifica, Campus UAB, C. Albareda s/n, 08193 Bellaterra, Centro de Investigaciones Energ’eticas, Medioambientales y Tecnol’ogicas), A. Tsyganov (Centre for Information Technology, University of Groningen, P.O. Box 11044, 9700 CA Groningen, The Netherlands), I. Tutusaus (Institut de Recherche en Astrophysique et Plan’etologie), L. Valenziano (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy, INFN-Bologna, Via Irnerio 46, 40126 Bologna, Italy), J. Valiviita (Department of Physics, P.O. Box 64, University of Helsinki, 00014 Helsinki, Finland, Helsinki Institute of Physics, Gustaf H"allstr"omin katu 2, University of Helsinki, 00014 Helsinki, Finland), T. Vassallo (Universit"ats-Sternwarte M"unchen, Fakult"at f"ur Physik, Ludwig-Maximilians-Universit"at M"unchen, Scheinerstrasse 1, 81679 M"unchen, Germany, INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy), G. Verdoes Kleijn (Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands), A. Veropalumbo (INAF-Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano, Italy, INFN-Sezione di Genova, Via Dodecaneso 33, 16146, Genova, Italy, Dipartimento di Fisica, Universit`a di Genova, Via Dodecaneso 33, 16146, Genova, Italy), Y. Wang (Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USA), J. Weller (Universit"ats-Sternwarte M"unchen, Fakult"at f"ur Physik, Ludwig-Maximilians-Universit"at M"unchen, Scheinerstrasse 1, 81679 M"unchen, Germany, Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, 85748 Garching, Germany), A. Zacchei (INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy, IFPU, Institute for Fundamental Physics of the Universe, via Beirut 2, 34151 Trieste, Italy), G. Zamorani (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy), F. M. Zerbi (INAF-Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano, Italy), E. Zucca (INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, 40129 Bologna, Italy), J. Mart’in-Fleitas (Aurora Technology for European Space Agency), V. Scottez (Institut d’Astrophysique de Paris, 98bis Boulevard Arago, 75014, Paris, France, ICL, Junia, Universit’e Catholique de Lille, LITL, 59000 Lille, France)
arXiv:2503.22497v2 Announce Type: replace
Abstract: We present a catalogue of 5306 new ultracool dwarf (UCD) candidates in the three Euclid Deep Fields in the Q1 data release. They range from late M to late T dwarfs, and include 1200 L and T dwarfs. A total of 546 objects have been spectroscopically confirmed, including 329 L dwarfs and 26 T dwarfs. We also provide empirical Euclid colours as a function of spectral type. Our UCD selection criteria are based only on colour ($I_mathrm{E}-Y_mathrm{E}>2.5$). The combined requirement for optical detection and stringent signal-to-noise ratio threshold ensure a high purity of the sample, but at the expense of completeness, especially for T dwarfs. The detections range from magnitudes 19 and 24 in the near-infrared bands, and extend down to 26 in the optical band. We discuss Euclid’s capability to identify UCD candidates based on its photometric passbands. The average surface density of detected UCDs on the sky is approximately 100 objects per $mathrm{deg}^2$, including 20 L and T dwarfs per $mathrm{deg}^2$. This leads to an expectation of at least 1.4 million ultracool dwarfs in the final data release of the Euclid Wide Survey, including at least $300,000$ L dwarfs, and more than 2600 T dwarfs, using the strict selection criteria from this work.arXiv:2503.22497v2 Announce Type: replace
Abstract: We present a catalogue of 5306 new ultracool dwarf (UCD) candidates in the three Euclid Deep Fields in the Q1 data release. They range from late M to late T dwarfs, and include 1200 L and T dwarfs. A total of 546 objects have been spectroscopically confirmed, including 329 L dwarfs and 26 T dwarfs. We also provide empirical Euclid colours as a function of spectral type. Our UCD selection criteria are based only on colour ($I_mathrm{E}-Y_mathrm{E}>2.5$). The combined requirement for optical detection and stringent signal-to-noise ratio threshold ensure a high purity of the sample, but at the expense of completeness, especially for T dwarfs. The detections range from magnitudes 19 and 24 in the near-infrared bands, and extend down to 26 in the optical band. We discuss Euclid’s capability to identify UCD candidates based on its photometric passbands. The average surface density of detected UCDs on the sky is approximately 100 objects per $mathrm{deg}^2$, including 20 L and T dwarfs per $mathrm{deg}^2$. This leads to an expectation of at least 1.4 million ultracool dwarfs in the final data release of the Euclid Wide Survey, including at least $300,000$ L dwarfs, and more than 2600 T dwarfs, using the strict selection criteria from this work.