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Euclid Quick Data Release (Q1) Ultracool dwarfs in the Euclid Deep Field North

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Main Authors:	Mohandasan, A., Smart, R. L., Reylé, C., Brun, V. Le, Pérez-Garrido, A., Bañados, E., Goldman, B., Casewell, S. L., Osorio, M. R. Zapatero, Dupuy, T., Rejkuba, M., Martín, E. L., Dominguez-Tagle, C., {Ž}erjal, M., Huélamo, N., Lodieu, N., Cruz, P., Rebolo, R., Phillips, M. W., Zhang, J. -Y., Aghanim, N., Altieri, B., Amara, A., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Balestra, A., Bardelli, S., Battaglia, P., Biviano, A., Bonchi, A., Branchini, E., Brescia, M., Brinchmann, J., Camera, S., Cañas-Herrera, G., Capobianco, V., Carbone, C., Carretero, J., Casas, S., Castellano, M., Castignani, G., Cavuoti, S., Chambers, K. C., Cimatti, A., Colodro-Conde, C., Congedo, G., Conselice, C. J., Conversi, L., Copin, Y., Costille, A., Courbin, F., Courtois, H. M., Cropper, M., Da Silva, A., Degaudenzi, H., De Lucia, G., Dole, H., Douspis, M., Dubath, F., Dupac, X., Dusini, S., Escoffier, S., Farina, M., Faustini, F., Ferriol, S., Fotopoulou, S., Frailis, M., Franceschi, E., Galeotta, S., George, K., Gillard, W., Gillis, B., Giocoli, C., Gracia-Carpio, J., Granett, B. R., Grazian, A., Grupp, F., Haugan, S. V. H., Hoar, J., Holmes, W., Hook, I. M., Hormuth, F., Hornstrup, A., Jahnke, K., Jhabvala, M., Keihänen, E., Kermiche, S., Kiessling, A., Kubik, B., Kuijken, K., Kümmel, M., Kunz, M., Kurki-Suonio, H., Boulc'h, Q. Le, Brun, A. M. C. Le, Mignant, D. Le, Ligori, S., Lilje, P. B., Lindholm, V., Lloro, I., Mainetti, G., Maino, D., Maiorano, E., Mansutti, O., Marcin, S., Marggraf, O., Martinelli, M., Martinet, N., Marulli, F., Massey, R., Medinaceli, E., Mei, S., Mellier, Y., Meneghetti, M., Merlin, E., Meylan, G., Mora, A., Moresco, M., Moscardini, L., Nakajima, R., Neissner, C., Niemi, S. -M., Padilla, C., Paltani, S., Pasian, F., Pedersen, K., Percival, W. J., Pettorino, V., Pires, S., Polenta, G., Poncet, M., Popa, L. A., Pozzetti, L., Raison, F., Renzi, A., Rhodes, J., Riccio, G., Romelli, E., Roncarelli, M., Saglia, R., Sakr, Z., Sapone, D., Sartoris, B., Schewtschenko, J. A., Schirmer, M., Schneider, P., Schrabback, T., Secroun, A., Seidel, G., Serrano, S., Simon, P., Sirignano, C., Sirri, G., Stanco, L., Steinwagner, J., Surace, C., Tallada-Crespí, P., Taylor, A. N., Tereno, I., Toledo-Moreo, R., Torradeflot, F., Tsyganov, A., Tutusaus, I., Valenziano, L., Valiviita, J., Vassallo, T., Kleijn, G. Verdoes, Veropalumbo, A., Vibert, D., Wang, Y., Weller, J., Zacchei, A., Zamorani, G., Zerbi, F. M., Zucca, E., Martín-Fleitas, J., Scottez, V.
Format:	Preprint
Published:	2025
Subjects:	Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics
Online Access:	Acceder al recurso
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author	Mohandasan, A. Smart, R. L. Reylé, C. Brun, V. Le Pérez-Garrido, A. Bañados, E. Goldman, B. Casewell, S. L. Osorio, M. R. Zapatero Dupuy, T. Rejkuba, M. Martín, E. L. Dominguez-Tagle, C. {Ž}erjal, M. Huélamo, N. Lodieu, N. Cruz, P. Rebolo, R. Phillips, M. W. Zhang, J. -Y. Aghanim, N. Altieri, B. Amara, A. Andreon, S. Auricchio, N. Baccigalupi, C. Baldi, M. Balestra, A. Bardelli, S. Battaglia, P. Biviano, A. Bonchi, A. Branchini, E. Brescia, M. Brinchmann, J. Camera, S. Cañas-Herrera, G. Capobianco, V. Carbone, C. Carretero, J. Casas, S. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K. C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conselice, C. J. Conversi, L. Copin, Y. Costille, A. Courbin, F. Courtois, H. M. Cropper, M. Da Silva, A. Degaudenzi, H. De Lucia, G. Dole, H. Douspis, M. Dubath, F. Dupac, X. Dusini, S. Escoffier, S. Farina, M. Faustini, F. Ferriol, S. Fotopoulou, S. Frailis, M. Franceschi, E. Galeotta, S. George, K. Gillard, W. Gillis, B. Giocoli, C. Gracia-Carpio, J. Granett, B. R. Grazian, A. Grupp, F. Haugan, S. V. H. Hoar, J. Holmes, W. Hook, I. M. Hormuth, F. Hornstrup, A. Jahnke, K. Jhabvala, M. Keihänen, E. Kermiche, S. Kiessling, A. Kubik, B. Kuijken, K. Kümmel, M. Kunz, M. Kurki-Suonio, H. Boulc'h, Q. Le Brun, A. M. C. Le Mignant, D. Le Ligori, S. Lilje, P. B. Lindholm, V. Lloro, I. Mainetti, G. Maino, D. Maiorano, E. Mansutti, O. Marcin, S. Marggraf, O. Martinelli, M. Martinet, N. Marulli, F. Massey, R. Medinaceli, E. Mei, S. Mellier, Y. Meneghetti, M. Merlin, E. Meylan, G. Mora, A. Moresco, M. Moscardini, L. Nakajima, R. Neissner, C. Niemi, S. -M. Padilla, C. Paltani, S. Pasian, F. Pedersen, K. Percival, W. J. Pettorino, V. Pires, S. Polenta, G. Poncet, M. Popa, L. A. Pozzetti, L. Raison, F. Renzi, A. Rhodes, J. Riccio, G. Romelli, E. Roncarelli, M. Saglia, R. Sakr, Z. Sapone, D. Sartoris, B. Schewtschenko, J. A. Schirmer, M. Schneider, P. Schrabback, T. Secroun, A. Seidel, G. Serrano, S. Simon, P. Sirignano, C. Sirri, G. Stanco, L. Steinwagner, J. Surace, C. Tallada-Crespí, P. Taylor, A. N. Tereno, I. Toledo-Moreo, R. Torradeflot, F. Tsyganov, A. Tutusaus, I. Valenziano, L. Valiviita, J. Vassallo, T. Kleijn, G. Verdoes Veropalumbo, A. Vibert, D. Wang, Y. Weller, J. Zacchei, A. Zamorani, G. Zerbi, F. M. Zucca, E. Martín-Fleitas, J. Scottez, V.
author_facet	Mohandasan, A. Smart, R. L. Reylé, C. Brun, V. Le Pérez-Garrido, A. Bañados, E. Goldman, B. Casewell, S. L. Osorio, M. R. Zapatero Dupuy, T. Rejkuba, M. Martín, E. L. Dominguez-Tagle, C. {Ž}erjal, M. Huélamo, N. Lodieu, N. Cruz, P. Rebolo, R. Phillips, M. W. Zhang, J. -Y. Aghanim, N. Altieri, B. Amara, A. Andreon, S. Auricchio, N. Baccigalupi, C. Baldi, M. Balestra, A. Bardelli, S. Battaglia, P. Biviano, A. Bonchi, A. Branchini, E. Brescia, M. Brinchmann, J. Camera, S. Cañas-Herrera, G. Capobianco, V. Carbone, C. Carretero, J. Casas, S. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K. C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conselice, C. J. Conversi, L. Copin, Y. Costille, A. Courbin, F. Courtois, H. M. Cropper, M. Da Silva, A. Degaudenzi, H. De Lucia, G. Dole, H. Douspis, M. Dubath, F. Dupac, X. Dusini, S. Escoffier, S. Farina, M. Faustini, F. Ferriol, S. Fotopoulou, S. Frailis, M. Franceschi, E. Galeotta, S. George, K. Gillard, W. Gillis, B. Giocoli, C. Gracia-Carpio, J. Granett, B. R. Grazian, A. Grupp, F. Haugan, S. V. H. Hoar, J. Holmes, W. Hook, I. M. Hormuth, F. Hornstrup, A. Jahnke, K. Jhabvala, M. Keihänen, E. Kermiche, S. Kiessling, A. Kubik, B. Kuijken, K. Kümmel, M. Kunz, M. Kurki-Suonio, H. Boulc'h, Q. Le Brun, A. M. C. Le Mignant, D. Le Ligori, S. Lilje, P. B. Lindholm, V. Lloro, I. Mainetti, G. Maino, D. Maiorano, E. Mansutti, O. Marcin, S. Marggraf, O. Martinelli, M. Martinet, N. Marulli, F. Massey, R. Medinaceli, E. Mei, S. Mellier, Y. Meneghetti, M. Merlin, E. Meylan, G. Mora, A. Moresco, M. Moscardini, L. Nakajima, R. Neissner, C. Niemi, S. -M. Padilla, C. Paltani, S. Pasian, F. Pedersen, K. Percival, W. J. Pettorino, V. Pires, S. Polenta, G. Poncet, M. Popa, L. A. Pozzetti, L. Raison, F. Renzi, A. Rhodes, J. Riccio, G. Romelli, E. Roncarelli, M. Saglia, R. Sakr, Z. Sapone, D. Sartoris, B. Schewtschenko, J. A. Schirmer, M. Schneider, P. Schrabback, T. Secroun, A. Seidel, G. Serrano, S. Simon, P. Sirignano, C. Sirri, G. Stanco, L. Steinwagner, J. Surace, C. Tallada-Crespí, P. Taylor, A. N. Tereno, I. Toledo-Moreo, R. Torradeflot, F. Tsyganov, A. Tutusaus, I. Valenziano, L. Valiviita, J. Vassallo, T. Kleijn, G. Verdoes Veropalumbo, A. Vibert, D. Wang, Y. Weller, J. Zacchei, A. Zamorani, G. Zerbi, F. M. Zucca, E. Martín-Fleitas, J. Scottez, V.
contents	Ultracool dwarfs (UCDs) encompass the lowest mass stars and brown dwarfs, defining the stellar substellar boundary. They have significant potential for advancing the understanding of substellar physics; however, these objects are challenging to detect due to their low luminosity. The wide coverage and deep sensitivity of the Euclid survey will increase the number of confirmed and well characterised UCDs by several orders of magnitude. In this study, we take advantage of the Euclid Quick Data Release (Q1) and in particular we look in detail at the known and new UCDs in the Euclid Deep Field North (22.9 deg2 down to JE = 24.5 mag), to understand the advantages of using the slitless Euclid spectroscopy. We compile a comparison sample of known UCDs and use their spectra to demonstrate the capability of Euclid to derive spectral types using a template matching method. This method is then applied to the spectra of the newly identified candidates. We confirm that 33 of these candidates are new UCDs, with spectral types ranging from M7 to T1 and JE = 17 to 21 mag. We look at their locus in colour colour diagrams and compare them with the expected colours of QSOs. A machine readable catalogue is provided for further study, containing both the comparison sample and the newly identified UCDs, along with their spectral classifications where the Q1 spectra quality allows for confident determination
format	Preprint
id	arxiv_https___arxiv_org_abs_2503_22559
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Euclid Quick Data Release (Q1) Ultracool dwarfs in the Euclid Deep Field North Mohandasan, A. Smart, R. L. Reylé, C. Brun, V. Le Pérez-Garrido, A. Bañados, E. Goldman, B. Casewell, S. L. Osorio, M. R. Zapatero Dupuy, T. Rejkuba, M. Martín, E. L. Dominguez-Tagle, C. {Ž}erjal, M. Huélamo, N. Lodieu, N. Cruz, P. Rebolo, R. Phillips, M. W. Zhang, J. -Y. Aghanim, N. Altieri, B. Amara, A. Andreon, S. Auricchio, N. Baccigalupi, C. Baldi, M. Balestra, A. Bardelli, S. Battaglia, P. Biviano, A. Bonchi, A. Branchini, E. Brescia, M. Brinchmann, J. Camera, S. Cañas-Herrera, G. Capobianco, V. Carbone, C. Carretero, J. Casas, S. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K. C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conselice, C. J. Conversi, L. Copin, Y. Costille, A. Courbin, F. Courtois, H. M. Cropper, M. Da Silva, A. Degaudenzi, H. De Lucia, G. Dole, H. Douspis, M. Dubath, F. Dupac, X. Dusini, S. Escoffier, S. Farina, M. Faustini, F. Ferriol, S. Fotopoulou, S. Frailis, M. Franceschi, E. Galeotta, S. George, K. Gillard, W. Gillis, B. Giocoli, C. Gracia-Carpio, J. Granett, B. R. Grazian, A. Grupp, F. Haugan, S. V. H. Hoar, J. Holmes, W. Hook, I. M. Hormuth, F. Hornstrup, A. Jahnke, K. Jhabvala, M. Keihänen, E. Kermiche, S. Kiessling, A. Kubik, B. Kuijken, K. Kümmel, M. Kunz, M. Kurki-Suonio, H. Boulc'h, Q. Le Brun, A. M. C. Le Mignant, D. Le Ligori, S. Lilje, P. B. Lindholm, V. Lloro, I. Mainetti, G. Maino, D. Maiorano, E. Mansutti, O. Marcin, S. Marggraf, O. Martinelli, M. Martinet, N. Marulli, F. Massey, R. Medinaceli, E. Mei, S. Mellier, Y. Meneghetti, M. Merlin, E. Meylan, G. Mora, A. Moresco, M. Moscardini, L. Nakajima, R. Neissner, C. Niemi, S. -M. Padilla, C. Paltani, S. Pasian, F. Pedersen, K. Percival, W. J. Pettorino, V. Pires, S. Polenta, G. Poncet, M. Popa, L. A. Pozzetti, L. Raison, F. Renzi, A. Rhodes, J. Riccio, G. Romelli, E. Roncarelli, M. Saglia, R. Sakr, Z. Sapone, D. Sartoris, B. Schewtschenko, J. A. Schirmer, M. Schneider, P. Schrabback, T. Secroun, A. Seidel, G. Serrano, S. Simon, P. Sirignano, C. Sirri, G. Stanco, L. Steinwagner, J. Surace, C. Tallada-Crespí, P. Taylor, A. N. Tereno, I. Toledo-Moreo, R. Torradeflot, F. Tsyganov, A. Tutusaus, I. Valenziano, L. Valiviita, J. Vassallo, T. Kleijn, G. Verdoes Veropalumbo, A. Vibert, D. Wang, Y. Weller, J. Zacchei, A. Zamorani, G. Zerbi, F. M. Zucca, E. Martín-Fleitas, J. Scottez, V. Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics Ultracool dwarfs (UCDs) encompass the lowest mass stars and brown dwarfs, defining the stellar substellar boundary. They have significant potential for advancing the understanding of substellar physics; however, these objects are challenging to detect due to their low luminosity. The wide coverage and deep sensitivity of the Euclid survey will increase the number of confirmed and well characterised UCDs by several orders of magnitude. In this study, we take advantage of the Euclid Quick Data Release (Q1) and in particular we look in detail at the known and new UCDs in the Euclid Deep Field North (22.9 deg2 down to JE = 24.5 mag), to understand the advantages of using the slitless Euclid spectroscopy. We compile a comparison sample of known UCDs and use their spectra to demonstrate the capability of Euclid to derive spectral types using a template matching method. This method is then applied to the spectra of the newly identified candidates. We confirm that 33 of these candidates are new UCDs, with spectral types ranging from M7 to T1 and JE = 17 to 21 mag. We look at their locus in colour colour diagrams and compare them with the expected colours of QSOs. A machine readable catalogue is provided for further study, containing both the comparison sample and the newly identified UCDs, along with their spectral classifications where the Q1 spectra quality allows for confident determination
title	Euclid Quick Data Release (Q1) Ultracool dwarfs in the Euclid Deep Field North
topic	Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics
url	https://arxiv.org/abs/2503.22559