Astronomers at the Institute of Astrophysics and Ciências do Espaço (IA) claim that they have found a "stellar twin" to…
Astronomers at the Institute of Astrophysics and Ciências do Espaço (IA) claim that they have found a “stellar twin” to the sun. The star in question, called HD 186302, was probably born in the same star chamber as the sun and lies 184 light years away from us. It is only Son’s second siblings so far.
Stellar siblings are quite common in the universe. In fact, almost all stars occur in crowded stables along with thousands of other stars. Eventually, galactic tidal forces break down the near-rigid star group and spread the stars about the galaxy.
Despite its implied ubiquity, it was difficult to limit the siblings of the sun. First, the astronomers trimmed a list of 17,000 candidates based on their similar metallicities (abundance of elements heavier than hydrogen or helium). After this initial analysis, the candidate pool was drastically reduced to only 55 stars and later to 4 after they had been grouped by the same age. Finally, only one candidate had carbon isotope ratios comparable to the Sun: HD 186302. It is only one of two stellar siblings ever identified after HD 162826, discovered in 2014.
Astronomers team was part of the AMBRE project – A collaboration between ESO and Observatory de la Côte d’Azur. AMBRE uses a series of spectrographs, along with data from the ESA GAIA mission, to identify ages, chemical abundance and stars of stars in the Milky Way.
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->  Another star that is almost identical to the sun is important for several reasons. First and foremost, by studying a nurse, researchers can gain a better understanding of where in the galaxy and under what conditions the sun formed. Because the HD 186302 has almost the same luminosity, temperature, size, age and chemical composition of the sun, the twin can help us find out more about how the earth and maybe even how life came. The research group wants to use ESO ESPRESSO and HARPS spectrographs in the future to look for some groundbreaking planets around the new twins.
“Some theoretical calculations show that there is an insignificant probability that life is spread from Earth to other planets or exoplanetary systems during the late heavy bombing period. If we are lucky and our sibling candidate has a planet and the planet is a rocky type, in the inhabited zone, and finally if this planet was “polluted” by life-seed from the earth, we have what we can dream about – a Earth 2.0 that revolves around a Sun 2.0, says Vardan Adibekyan, IA and University of Porto , in a statement.
The results are described in the journal Astronomy & Astrophysics.
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