ALMA Discovery of Dust Belts around Proxima Centauri

DOI: 
10.3847/2041-8213/aa978b
Publication date: 
01/11/2017
Main author: 
Anglada, Guillem
IAA authors: 
Anglada, Guillem;Amado, Pedro J.;Ortiz, Jose L.;Gómez, José F.;Alberdi, Antxon;Osorio, Mayra;Gómez, José L.;Pérez-Torres, Miguel A.;Berdiñas, Zaira M.;Lara, Luisa M.;López-González, Maria J.;López-Puertas, Manuel;Morales, Nicolas;Rodríguez-López, Cristina;Rodriguez, Eloy
Authors: 
Anglada, Guillem;Amado, Pedro J.;Ortiz, Jose L.;Gómez, José F.;Macías, Enrique;Alberdi, Antxon;Osorio, Mayra;Gómez, José L.;de Gregorio-Monsalvo, Itziar;Pérez-Torres, Miguel A.;Anglada-Escudé, Guillem;Berdiñas, Zaira M.;Jenkins, James S.;Jimenez-Serra, Izaskun;Lara, Luisa M.;López-González, Maria J.;López-Puertas, Manuel;Morales, Nicolas;Ribas, Ignasi;Richards, Anita M. S.;Rodríguez-López, Cristina;Rodriguez, Eloy
Journal: 
The Astrophysical Journal
Refereed: 
Yes
Publication type: 
Article
Volume: 
850
Pages: 
L6
Abstract: 

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.

Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85035345799&doi=10.3847%2f2041-8213%2faa978b&partnerID=40&md5=ba2cab91e56fedb1fbbddba6e42b62c2
ADS Bibcode: 
2017ApJ...850L...6A
Keywords: 
circumstellar matter;planetary systems;radio continuum: planetary systems;stars: individual: Proxima Centauri;Astrophysics - Earth and Planetary Astrophysics