Stars

Artistic concept of Proxima b's surface. In the upper-right of Proxima Centauri there are Alpha Centauri A and B (Image ESO/M. Kornmesser)

Yesterday ESO held a press conference to announce that probably they discovered an exoplanet orbiting Proxima Centauri, the nearest star to the solar system. A team of astronomers led by Guillem Anglada-Escudé from Queen Mary University of London found what was called Proxima b, a planet a little more massive than the Earth orbiting in the habitable zone of its star.

Artist's concept of G11.92-0.61 MM1 with the keplerian disc around it (Image courtesy A. Smith (Institute of Astronomy, Cambridge))

An article published in the journal “Monthly Notices of the Royal Astronomical Society” describes the discovery of a protostar called G11.92-0.61 MM1. A team of astronomers led by John Ilee from the University of Cambridge’s Institute of Astronomy, UK, identified this object in a key stage in the birth of a star. It has a mass that is already more than thirty times that of the Sun and is still attracting materials from the molecular cloud in which it’s forming.

The supernova remnants G11.2-0.3 (Photo X-ray: NASA/CXC/NCSU/K. Borkowski et al; Optical: DSS)

At the workshop “Chandra Science for the Next Decade” being held in Cambridge, Massachusetts, a new image was presented showing a supernova remnant called G11.2-0.3 obtained using NASA’s Chandra X-ray Observatory. For years these were considered the remnants of the supernova recorded by the Chinese in 386 A.D. and for this reason known as SN 386 but new exams indicate that it was a different supernova.

An article published in “The Astrophysical Journal Supplement Series” describes a research on brown dwarfs, objects on the border between stars and planets. A team of researchers led by Jacqueline Fahery of the Carnegie Institution examined the characteristics of 152 young brown dwarfs and concluded that their atmospheres’ properties might be the behind their differences.

A moment of the July 24, 2016 solar flare (Image NASA's Goddard Space Flight Center; Joy Ng, producer/IRIS/Lockheed Martin Solar and Astrophysics Laboratory)

NASA released the images captured by its IRIS space probe that show a kind of rain that fell on the Sun on July 24, 2016. This event occurred during a mid-level solar flare that led to the ejection of solar material, plasma at very high temperatures which then fell like rain and for this reason is called coronal rain or in more technical jargon post-flare loops.