Stars

Blogs about stars

Artist's impressione of the exoplanet Ross 128 b and its star (Image ESO/M. Kornmesser)

An article published in the journal “Astronomy & Astrophysics” describes the discovery of the exoplanet Ross 128 b, which might be similar to Earth with a mass of at least 35% higher than the Earth’s. A team of researchers used the HARPS instrument at the Silla Observatory in Chile to discover this planet about 11 light years from Earth. Its orbit might be in ​its system’s habitable zone making it the second exoplanet closest to the solar system with those characteristics after Proxima b.

The HD 135344B system

An article published in the magazine “The Astrophysical Journal” describes a research on the protoplanetary disk surrounding the star HD 135344B. A team led by Tomas Stolker of the ETH in Zurich, Switzerland, used the SPHERE instrument mounted on ESO’s VLT (Very Large Telescope) to monitor the evolution of that dust and gas disk and of the dark bands that appear as shadows projected on it. Probably there are processes in the disk’s inner area that cause shadows on its outer area.

The first iPTF14hls explosion (Image courtesy Arcavi et ​al. ​2017, ​Nature)

An article published in the journal “Nature” describes the discovery of a supernova that seems to have exploded more than once. Called iPTF14hls, it was identified in 2014 by the Intermediate Palomar Transient Factory but in that position a supernova had already been recorded in 1954. It could be the first case discovered of a type of supernova called a pulsational pair-instability supernova, in which a star is so hot and massive that it produces in its core antimatter that causes periodic explosions.

Artist's concept of the Proxima Centauri system (Image ESO/M. Kornmesser)

An article published in the magazine “Astrophysical Journal Letters” describes the discovery of a cold dust ring around Proxima Centauri, the star closest to the solar system. A team of researchers led by Guillem Anglada from the Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain, used the ALMA radio telescope to locate that ring that extends for a distance between one and four times that of the Earth from the Sun. There might also be a second ring, much farther from its star, a situation that makes the researchers think of a complex solar system.

Artist's impression of the planet NGTS-1b and its star (Image University of Warwick/Mark Garlick)

An article published in the magazine “Monthly Notices of the Royal Astronomical Society” describes the discovery of a hot Jupiter-type gas giant planet orbiting the star NGTS-1, a red dwarf. This is an extraordinary pair that’s in conflict with the current planetary formation models. The exoplanet NGTS-1b is the first to be discovered with the new Next Generation Transit Survey (NGTS) instrument installed at ESO’s Paranal Observatory in Chile.