Astronomers Find Two Dust Belts round Proxima Centauri | Astronomy

Using the Atacama Large Millimeter/submillimeter Array (ALMA), astronomers have detected mud belts round Proxima Centauri, the star closest to our Sun. Full particulars of the invention can be printed within the Astrophysical Journal Letters ( preprint).

This artist’s impression reveals how the newly-discovered mud belts round Proxima Centauri could look. This sketch is to not scale — to make Proxima b clearly seen it has been proven farther from the star and bigger than it’s in actuality. Image credit score: M. Kornmesser / ESO.

Proxima Centauri is a purple dwarf star solely four.23 light-years away within the constellation Centaurus. It just isn’t seen to the bare eye and lies close to to the a lot brighter pair, Alpha Centauri AB.

The star is understood to host no less than one exoplanet — the Earth-mbad world Proxima b — in a temperate orbit.

But there’s extra to this technique than only a single planet.

The new ALMA observations reveal the glow coming from chilly mud in a area between 1 to four AU (astronomical models).

This belt has a complete mbad of about one hundredth of the Earth’s mbad is estimated to have a temperature of about minus 230 levels Celsius (minus 382 levels Fahrenheit), as chilly as that of the Kuiper Belt within the outer Solar System.

“The dust around Proxima Centauri is important because, following the discovery of Proxima b, it’s the first indication of the presence of an elaborate planetary system, and not just a single planet, around the star closest to our Sun,” stated lead creator Dr. Guillem Anglada, from the Instituto de Astrofísica de Andalucía in Spain.

“Dust belts are the remains of material that did not form into larger bodies such as planets. The particles of rock and ice in these belts vary in size from the tiniest dust grain, smaller than a millimeter across, up to asteroid-like bodies many kilometers in diameter.”

The ALMA information additionally trace on the presence of a particularly chilly outer belt round Proxima Centauri.

According to the astronomers, the outer belt is roughly 30 AU from the star and has a temperature of about minus 263 levels Celsius (minus 441 levels Fahrenheit).

If confirmed, the character of this belt is intriguing, given its very chilly setting removed from a star that’s cooler and fainter than the Sun.

Both belts are a lot farther from Proxima Centauri than Proxima b, which orbits at simply zero.05 AU from the star.

“This result suggests that Proxima Centauri may have a multiple planet system with a rich history of interactions that resulted in the formation of a dust belt,” Dr. Anglada stated.

“Further study may also provide information that might point to the locations of as yet unidentified additional planets.”


Guillem Anglada et al. 2017. ALMA Discovery of Dust Belts round Proxima Centauri. ApJL, in press; arXiv: 1711.00578

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