An international team1 led by the Instituto de Astrofísica e Ciências do Espaço (IA2) recently discovered sun brothers and sisters. Located about 184 light years from here, it’s called HD 186302, and it’s almost certainly at least the long-lost brother of our home star.
Solar brothers and sisters – a huge number of stars that were formed in an indistinguishable huge group from the Sun, about 4.6 billion years ago. Over time, the stars in the heap disbanded and scattered throughout our galaxy, which makes it extremely difficult to detect them.
Vardan Adibekyan (IA & University of Porto) explains the importance of finding these stars: “Since there is little information about the past of the Sun, studying these stars can help us understand where in the Galaxy and under what conditions the Sun was formed. "
“In cooperation with Patrick de Laverney and Alejandra Reggio Blanco from the Observatory on the Cote d'Azur, we received a sample of 230,000 spectra from the AMBRE project. AMBRE is a galactic archeology project created by ESO and the Observatoire de la Côte d & # 39; Azur, with the goal of determining the stellar atmospheric parameters for archived spectra from the FEROS, HARPS4, UVES and GIRAFFE spectrographs from ESO. ”
Solar brothers and sisters can also be a great contender to seek life, as there is a possibility that life could be transferred between the planets around the stars of the solar group. The exchange of life between exoplanetary frameworks is called interstellar lithopanspermia.
Adibekyan is wary of this possibility: “Some theoretical calculations show that there is a slight chance that life has spread from Earth to other planets or exoplanetary systems during the period of late heavy bombardment. If we are lucky, and our satellite has a planet, and the planet is rocky, in a residential area, and, finally, if this planet was “infected” with the seeds of life from Earth, then we have something to dream about – Earth 2.0 revolving around the Sun 2.0 ".
The IA team plans to launch a campaign to search for planets around this star using HARPS and ESPRESSO spectrographs. Search and characterization of planetary systems around solar brothers and sisters can return very important information about the outcome of the planets in a common environment.
The article was published in the journal Astronomy and Astrophysics.