Family ties
Family ties
Is HD 186302 the lost sister of the Sun?
Stars do not like loneliness. The Most are born in groups that can contain thousands of them, inside what is known as stellar nurseries, immense clouds of gas and dust that gradually collapse giving rise to huge amounts of stellar bodies, from giant to red dwarfs or even brown dwarfs. It is believed that the Sun He began his life in this way, about 4.57 billion years ago.
Over time these unstable groupings are broken and their members undertake independent paths, but most never end completely alone. It is estimated that up to 85 percent of all stars are included in binary, triple or quadruple systems. More recent studies suggest even that most, if not all, stars are born with a binary twin.
Our Sun it is a solitary star, which makes it a kind of stellar "oddball", which adds to other characteristics that are out of the ordinary, such as the distribution of its planets, which differs in everything seen in other systems, and the lack of what is considered the most common kind of planet in the galaxy, the so-called SuperTierras. However, astronomers consider that it is most plausible that the Solar System was born within a binary system, with a twin companion, another "Sun", that at some time and for some reason, broke the gravitational ties and left us alone. For simple statistics and the rarities of our planetary system, which could be the result of the presence and departure of that lost sister. And maybe now found.
To date only a few candidates were known who fit what would be expected from a sister of the Sun. But now a team led by researchers from the Institute of Astrophysics and Space Sciences (IA), equipped with better tools than previous searches, including valuable mission data Gaia, seems to have found the most likely candidate. It is known as HD186302 and it's incredibly similar to Sun: Of the main sequence, of type G, practically of the same size, temperature and
luminosity of the surface. And what is more revealing, of the same age and with a composition
chemistry almost indéntica, which means that they must have been born very close to each other, or at least in the same cloud.
Although none of that ensures that we are before the theorized lost sister of the Sun, its extreme similarity with our star is at least intriguing, in addition to offering ample possibilities. For astronomers, locating it would be an extraordinary gift in the efforts to reconstruct the history of our planetary system, since it would allow us to know where our star was born, in what part of the galaxy and in what conditions it was formed. And if I had planets, which will be determined in future observations, dreaming is free.
In the center of the image, considered now the best candidate to be the sister of the Sun, with whom she shares extraordinary similarities.
The Gaia data promised to be an incredible tool that would launch the exploration of our galaxy to another level. The finding of HD 186302 is one of its results.Astronomers May Have Just Discovered Our Sun's Long-Lost Identical Twin
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