ALMA Discovery of Dust Belts around Proxima Centauri

被引：30

作者：

Anglada, Guillem ^{[1
]}

Amado, Pedro J. ^{[1
]}

Ortiz, Jose L. ^{[1
]}

Gomez, Jose F. ^{[1
]}

Macias, Enrique ^{[2
]}

Alberdi, Antxon ^{[1
]}

Osorio, Mayra ^{[1
]}

Gomez, Jose L. ^{[1
]}

de Gregorio-Monsalvo, Itziar ^{[3
,4
]}

Perez-Torres, Miguel A. ^{[1
,5
]}

Anglada-Escude, Guillem ^{[6
]}

Berdinas, Zaira M. ^{[1
,7
]}

Jenkins, James S. ^{[7
]}

Jimenez-Serra, Izaskun ^{[6
]}

Lara, Luisa M. ^{[1
]}

Lopez-Gonzalez, Maria J. ^{[1
]}

Lopez-Puertas, Manuel ^{[1
]}

Morales, Nicolas ^{[1
]}

Ribas, Ignasi ^{[8
]}

Richards, Anita M. S. ^{[9
]}

Rodriguez-Lopez, Cristina ^{[1
]}

Rodriguez, Eloy ^{[1
]}

机构：

[1] CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain

[2] Boston Univ, Dept Astron, 725 Commonwealth Ave, Boston, MA 02215 USA

[3] European Southern Observ, Alonso de Cordova 3107, Santiago, Chile

[4] Joint ALMA Observ, Alonso de Cordova 3107,Casilla 19001, Santiago 19, Chile

[5] Univ Zaragoza, Fac Ciencias, Dept Fs Teor, E-50009 Zaragoza, Spain

[6] Queen Mary Univ London, Sch Phys & Astron, 327 Mile End Rd, London E1 4NS, England

[7] Univ Chile, Dept Astron, Camino Observ, Santiago 1515, Chile

[8] Inst Ciencies Espai IEEC CSIC, C Can Magrans S-N,Campus UAB, E-08193 Bellaterra, Spain

[9] Univ Manchester, Sch Phys & Astron, JBCA, Manchester M13 9PL, Lancs, England

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2017年 / 850卷 / 01期

关键词：

circumstellar matter; planetary systems; radio continuum: planetary systems; stars: individual (Proxima Centauri); SIZE DISTRIBUTION; EPSILON-ERIDANI; DEBRIS DISC; HOT DUST; TAU-CETI; EVOLUTION;

D O I：

10.3847/2041-8213/aa978b

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 degrees 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.

引用

页数：5

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