ALMA Discovery of Dust Belts around Proxima Centauri
Resumen: 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.
Idioma: Inglés
DOI: 10.3847/2041-8213/aa978b
Año: 2017
Publicado en: ASTROPHYSICAL JOURNAL LETTERS 850, 1 (2017), L6 [5 pp]
ISSN: 2041-8205

Factor impacto JCR: 6.634 (2017)
Categ. JCR: ASTRONOMY & ASTROPHYSICS rank: 8 / 66 = 0.121 (2017) - Q1 - T1
Factor impacto SCIMAGO: 3.186 - Space and Planetary Science (Q1) - Astronomy and Astrophysics (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/AYA2014-56637-C2-1-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO/AYA2014-57369-C3-3-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO/AYA2015-63939-C2-1-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO/AYA2016-79425-C3-3-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO/ESP2014-54032-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/ESP2014-54362-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO/ESP2016-76076-R
Tipo y forma: Article (Published version)
Área (Departamento): Área Física Teórica (Dpto. Física Teórica)

Creative Commons You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. If you remix, transform, or build upon the material, you may not distribute the modified material.

Exportado de SIDERAL (2019-07-09-12:27:47)

Este artículo se encuentra en las siguientes colecciones:

 Record created 2017-12-22, last modified 2019-07-09

Versión publicada:
Rate this document:

Rate this document:
(Not yet reviewed)