E. L. Martín, M. Žerjal, H. Bouy, D. Martin-Gonzalez, S. Muñoz Torres, D. Barrado, J. Olivares, A. Pérez-Garrido, P. Mas-Buitrago, P. Cruz, E. Solano, M. R. Zapatero Osorio, N. Lodieu, V. J. S. Béjar, J. Zhang, C. del Burgo, N. Huélamo, R. J. Laureijs, A. Mora, T. Saifollahi, J. -C. Cuillandre, M. Schirmer, R. Tata, S. Points, N. Phan-Bao, B. Goldman, S. L. Casewell, C. Reylé, R. L. Smart, C. Dominguez-Tagle, A. Escobar, N. Sedighi, S. Tsilia, N. Vitas, A. Ayadi, N. Aghanim, B. Altieri, S. Andreon, N. Auricchio, M. Baldi, A. Balestra, S. Bardelli, A. Basset, R. Bender, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V. Capobianco, C. Carbone, J. Carretero, S. Casas, M. Castellano, S. Cavuoti, A. Cimatti, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, L. Corcione, F. Courbin, H. M. Courtois, M. Cropper, A. C. da Silva, H. Degaudenzi, A. M. Di Giorgio, J. Dinis, F. Dubath, X. Dupac, S. Dusini, A. Ealet, M. Farina, S. Farrens, S. Ferriol, P. Fosalba, M. Frailis, E. Franceschi, M. Fumana, S. Galeotta, B. Garilli, W. Gillard, B. R. Gillis, C. Giocoli, P. Gómez-Alvarez, A. Grazian, F. Grupp, L. Guzzo, S. V. H. Haugan, J. Hoar, H. Hoekstra, W. A. Holmes, I. M. Hook, F. Hormuth, A. Hornstrup, D. Hu, P. Hudelot, K. Jahnke, M. Jhabvala, E. Keihänen, S. Kermiche, A. Kiessling, M. Kilbinger, T. D. Kitching, R. Kohley, B. Kubik, M. Kümmel, M. Kunz, H. Kurki-Suonio, D. Le Mignant, S. Ligori, P. B. Lilje, V. Lindholm, I. Lloro, D. Maino, E. Maiorano, O. Mansutti, O. Marggraf, N. Martinet, F. Marulli, R. Massey, E. Medinaceli, S. Mei, M. Melchior, Y. Mellier, M. Meneghetti, G. Meylan, J. J. Mohr, M. Moresco, L. Moscardini, S. M. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, V. Pettorino, S. Pires, G. Polenta, M. Poncet, L. A. Popa, L. Pozzetti, G. D. Racca, F. Raison, R. Rebolo, A. Renzi, J. D. Rhodes, G. Riccio, H. -W. Rix, E. Romelli, M. Roncarelli, E. Rossetti, R. Saglia, D. Sapone, B. Sartoris, M. Sauvage, R. Scaramella, P. Schneider, A. Secroun, G. Seidel, M. D. Seiffert, S. Serrano, C. Sirignano, G. Sirri, L. Stanco, P. Tallada-Crespí, A. N. Taylor, H. I. Teplitz, I. Tereno, R. Toledo-Moreo, A. Tsyganov, I. Tutusaus, L. Valenziano, T. Vassallo, G. A. Verdoes Kleijn, Y. Wang, J. Weller, O. R. Williams, E. Zucca, C. Baccigalupi, G. Willis, P. Simon, J. M. Martín-Fleitas, D. Scott
Abstract
We provide an early assessment of the imaging capabilities of the Euclid space mission to deeply probe nearby star-forming regions and associated very young open clusters, and in particular, to determine to which extent it can shed light into the newborn free- floating planet population. This paper focusses on a low-reddening region observed in just one Euclid pointing. The dust and gas has been cleared out from the region by the hot σ Orionis star. One late-M and six known spectroscopically confirmed L-type ultracool members in the σ Orionis cluster were used as benchmarks to provide a high-purity procedure to select new candidate members with Euclid. The exquisite angular resolution and depth delivered by the Euclid instruments allowed us to focus on bona fide point sources. A cleaned sample of σ Orionis cluster substellar members was produced, and the initial mass function (IMF) was estimated by combining Euclid and Gaia data. Our σ Orionis substellar IMF is consistent with a power-law distribution without a significant steepening at the planetary-mass end. No evidence of a low-mass cutoff is found down to the detection limit of this study at 4 Jupiter masses in the very young σ Orionis open cluster.
Keywords
catalogs / surveys / astrometry
Notes
This paper is published on behalf of the Euclid Consortium.
Astronomy & Astrophysics
Volume 697, Article Number A7, Number of pages 15
2025 May
