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STELLAR CHEMISTRY
A solar sibling identical to the Sun
by Staff Writers
Porto, Portugal (SPX) Nov 19, 2018

Open star cluster Trumpler 14, a cluster with more than two thousand stars, similar to the one where the Sun was born. Credit: ESO/H. Sana

An international team, led by Instituto de Astrofisica e Ciencias do Espaco (IA) researcher Vardan Adibekyan, used a novel method to detect solar siblings. The article was published in the journal Astronomy and Astrophysics.

Solar siblings are the thousands of stars which formed in the same massive cluster as the Sun, about 4.6 billion years ago. As time went by, the stars in the cluster disbanded and scattered throughout our galaxy, making it very difficult to find them.

Vardan Adibekyan (IA and University of Porto) explains the importance of finding these stars: "Since there isn't much information about the Sun's past, studying these stars can help us understand where in the galaxy and under which conditions the Sun was formed."

He adds: "With the collaboration of Patrick de Laverny and Alejandra Recio-Blanco, from the Cote d'Azur observatory, we got a sample of 230,000 spectra from the AMBRE project." AMBRE is a galactic archaeology project, set up by ESO and the Observatoire de la Cote d'Azur, in order to determine the stellar atmospheric parameters for the archived spectra from ESO's FEROS, HARPS, UVES and GIRAFFE spectrographs.

Next, the team used these very high quality spectral data from the AMBRE project together with very precise astrometric data retrieved from the second release of ESA's GAIA mission, in order to "make a selection of stars with chemical compositions which best match the Sun's composition, followed by an estimate of these stars age and kinematic properties," said Vardan Adibekyan.

Although only a single solar sibling was found in this work - HD 186302 - it was a special one. This G3 type main sequence star is not only a solar sibling by both age and chemical composition, but it is also a solar twin.

Solar siblings might also be good candidates to search for life since there is a possibility that life could have been transported between planets around stars of the solar cluster. The transfer of life between exoplanetary systems is called interstellar lithopanspermia.

Adibekyan is cautiously excited about this possibility: "Some theoretical calculations show that there is non-negligible probability that life spread from Earth to other planets or exoplanetary systems, during the period of the late heavy bombardment.

If we are lucky, and our sibling candidate has a planet, and the planet is a rocky type, in the habitable zone, and finally if this planet was 'contaminated' by the life seeds from Earth, then we have what one could dream - an Earth 2.0, orbiting a Sun 2.0."

The team at IA plans to start a campaign to search for planets around this star using both HARPS and ESPRESSO spectrographs. Finding and characterizing planetary systems around solar siblings could return very important information about the outcome of planet formation in a common environment.

Research Report: "The AMBRE Project: Searching for the Closest Solar Siblings," V. Adibekyan et al., 2018 Nov., Astronomy and Astrophysics


Related Links
Instituto De AstrofIsica E CiEncias Do EspaCo
Stellar Chemistry, The Universe And All Within It


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STELLAR CHEMISTRY
The most luminous galaxy is eating its neighbors
Pasadena CA (JPL) Nov 16, 2018
The most luminous galaxy ever discovered is cannibalizing not one, not two, but at least three of its smaller neighbors, according to a new study published (Nov. 15) in the journal Science and coauthored by scientists from NASA's Jet Propulsion Laboratory in Pasadena, California. The material that the galaxy is stealing from its neighbors is likely contributing to its uber-brightness, the study shows. Discovered by NASA's space-based Wide-field Infrared Survey Explorer (WISE) in 2015, the galaxy, ... read more

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