Discovery of an exoplanet which helps us to understand the formation of Mercury

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Almería, April 6th, 2018

The planet K2-229b has a similar composition to Mercury, because the vicinity to its sun blows its mantle, forming an atmosphere of evaporated silicates. This finding is partly based on data obtained from Calar Alto.

An international team has found a planetary system around a star (named K2-229) similar to our Sun, which helps us to understand the formation and properties of the planet Mercury. The planet K2-229b, lying in this system, has a composition very similar to that of Mercury. The finding, published in Nature Astronomy, is the result of an international cooperation led by Alexandre Santerne, from Centre National de la Recherche Scientifique (CNRS, France).

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New light on the Trifid Nebula, a star nursery as old as Homo sapiens

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Almería, March 26th 2018

The Trifid Nebula is a well-known complex of young stars, some of them still hidden in the cloud of gas and dust from which they were born.

A new study, using data from the Calar Alto Observatory, sheds new light on this intricate stellar nursery of multi-epoch star formation in the last 300,000 years.

The Trifid Nebula, discovered in 1764, is visible with small telescopes as a diffuse patch of light towards the constellation of Sagittarius, in the densest regions of the Milky Way. It includes a group of thousands of very young stars embedded in a nebula, a mixture of gas and dust particles, which constitutes the deposit of material to form future stars.

Its name refers to its most striking visual feature: a nebula divided into three lobes by dark clouds of dense molecular material. New infrared observations, which allow us to see through the dust, reveal a complex area of ongoing star formation in its darkest parts, which began about 300,000 years ago, the age of Homo sapiens.

 

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Library of galaxy histories reconstructed from motions of stars

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Almería, January 3rd 2018

The CALIFA survey allows to map the orbits of the stars of a sample of 300 galaxies, a fundamental information to know how they formed and evolved.

Just like the Sun is moving in our Galaxy, the Milky Way, all the stars in galaxies are moving, but with very different orbits: some of the stars have strong rotations, while others may be moving randomly with no clear rotation. Comparing the fraction of stars on different orbits we can find out how galaxies form and evolve. An international team of astronomers has derived directly, for the first time, the orbital distribution of a galaxy sample, containing more than 300 galaxies of the local universe. The results, published in Nature Astronomy, are based on the CALIFA survey, a project developed at Calar Alto Observatory.

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Search for planets with Carmenes successful

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December 18th 2017

Since 2016, German and Spanish researchers are hunting for planets with the Carmenes spectrograph. They have now discovered their first star with an exoplanet.

The star is a so-called M-dwarf only about half as massive as the Sun, its planet with the name HD 147379b is slightly more massive than Neptune. HD 147379b orbits its star once every 86 days at a distance that is only a third of the distance between Earth and the Sun. At this location, the planet is located inside the so-called habitable zone where water could exist in liquid form. However, it is unlikely that life could develop on this planet because it probably has no solid surface.

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