64319 20190709135621.0 doi 10.3847/2041-8213/aa978b sideral 103560 ART-2017-103560 eng Anglada, G. ALMA Discovery of Dust Belts around Proxima Centauri 2017 Access copy available to the general public Unrestricted Proxima Centauri, the star closest to our Sun, is known to host at least one terrestrial planet candidate in a temperate orbit. Here we report the Atacama Large Millimeter/submillimeter Array (ALMA) detection of the star at 1.3 mm wavelength and the discovery of a belt of dust orbiting around it at distances ranging between 1 and 4 au, approximately. Given the low luminosity of the Proxima Centauri star, we estimate a characteristic temperature of about 40 K for this dust, which might constitute the dust component of a small-scale analog to our solar system''s Kuiper Belt. The estimated total mass, including dust and bodies up to 50 km in size, is of the order of 0.01 Earth masses, which is similar to that of the solar Kuiper Belt. Our data also show a hint of warmer dust closer to the star. We also find signs of two additional features that might be associated with the Proxima Centauri system that still require further observations to be confirmed: an outer extremely cold (about 10 K) belt around the star at about 30 au, with an orbital plane that is tilted about 45° with respect to the plane of the sky; additionally, we marginally detect a compact 1.3 mm emission source at a projected distance of about 1.2 arcsec from the star, the nature of which is still unknown. info:eu-repo/grantAgreement/ES/MINECO/ESP2016-76076-R info:eu-repo/grantAgreement/ES/MINECO/ESP2014-54362-P info:eu-repo/grantAgreement/ES/MINECO/ESP2014-54032-R info:eu-repo/grantAgreement/ES/MINECO/AYA2016-79425-C3-3-P info:eu-repo/grantAgreement/ES/MINECO/AYA2015-63939-C2-1-P info:eu-repo/grantAgreement/ES/MINECO/AYA2014-57369-C3-3-P info:eu-repo/grantAgreement/ES/MINECO/AYA2014-56637-C2-1-P info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 6.634 2017 ASTRONOMY & ASTROPHYSICS 8 / 66 = 0.121 2017 Q1 T1 3.186 2017 Space and Planetary Science 2017 Q1 Astronomy and Astrophysics 2017 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Amado, P.J. Ortiz, J.L. Gómez, J.F. MacIas, E. Alberdi, A. Osorio, M. Gómez, J.L. Gregorio-Monsalvo, I.D. (orcid)0000-0001-5654-0266 Pérez-Torres, M.A. Universidad de Zaragoza Anglada-Escudé, G. Berdinas, Z.M. Jenkins, J.S. Jimenez-Serra, I. Lara, L.M. López-González, M.J. López-Puertas, M. Morales, N. Ribas, I. Richards, A.M.S. Rodriguez-López, C. Rodriguez, E. 2004 405 Universidad de Zaragoza Dpto. Física Teórica Área Física Teórica 850, 1 (2017), L6 [5 pp] ASTROPHYSICAL JOURNAL LETTERS ASTROPHYSICAL JOURNAL LETTERS 2041-8205 986340 http://zaguan.unizar.es/record/64319/files/texto_completo.pdf Versión publicada 133141 http://zaguan.unizar.es/record/64319/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:64319 articulos driver 2019-07-09-12:27:47 ARTICLE