Worlds in the fast Barnard
Worlds in the fast Barnard
A super-Earth orbits this star, only 6 light-years away from us.
The Celestial Vault transmits a feeling of firmness, of being something static and eternal to human eyes. It is an illusion fruit of our fleeting existence if it is compared with the one of the stars, and also by certain lack of collective memory, since within the short existence of the Humanity they are not few those that have been varied slightly their position in the firmament . However we tend to take into account only our personal memories, and in them those points of light in the sky are always in the same place, yesterday, today and forever.
Bernard completely defies that idea, since its apparent movement with respect to the Sun is so high that throughout an average human life the equivalent of half a full moon can move. Unfortunately it is so dim that it can not be seen with the naked eye, but for anyone who knows it, it is evident that we live in a dynamic and changing star river. Motives more than enough to make it a more famous star among astronomers. And if that was not enough, now we know that she does not travel alone.It's hand in hand with projects Red Dots Y CARMEN IS, that look for rocky worlds in nearby stars, and that were already the discoverers of an exoplanet in Proxima Centauri, that we get the confirmation that Benard is also accompanied, in this case possibly from a supertierra, with a mass of at least 3.2 times that of the land, and orbit its small, reddish Sun once every 233 days. A place that seems to be quite cold, since we are in a red dwarf, a star of low mass, which illuminates in a very weak way the now named Barnard b, giving it barely 2% of the energy received by the land of the Sun, although it is much closer to her. We can imagine a landscape dimly lit by a weak Sun, a world of gloom with temperatures that could go down to -170Cº. It seems unlikely that there is anything alive in it, at least as we can imagine.
The discovery puts an end to a long road of previous disappointments, where it was not possible to find anything. Now, however, we have new technologies at our disposal that have allowed us to bring it to light. "After careful analysis, we are convinced 99% that the planet is there,"
affirms the scientist who leads the team, Ignasi Ribas (Institute of
space studies of Catalonia and Institute of Space Sciences,
CSIC). "However, we will continue to observe this fast
star to exclude possible, but unlikely, natural variations
of the star luminosity that can be confused with a planet ". Among the instruments used are the famous planet hunter HARPS and the spectrograph UVES, both of ESO. "HARPS
played a vital role in this project. Data was combined
file of other equipment with new and overlapping measures of the
Barnard star of different facilities ", commented Guillem
Anglada Escudé (Queen Mary University of London). "The combination of instruments was key to be able to corroborate our results".Barnard It always caught our imagination. His fast movement through the sky, which can be captured in photographs taken a few years apart, broke the brutality of the immutability of the sky in a brutal way and opens the doors to a very different, immense and changing one. And now we know that someone accompanies her on her trip, a possibly rocky planet, and that in her heaven is the Sun the star that seems to want to challenge this antiquated notion of reality.
Imagining the possible appearance of this exoplanet around Barnard.
Its apparent movement over 9 years. While the stars in the background show no apparent movement, since it is too small to be captured in such a short space of time, his is spectacular.
The journey of the closest stars over several billions of years. In the future Barnard will be as close to the Sun as Proxima Centauri is, and then move away as fast as it came. But it is not the only one. We live in a changing and dynamic stellar river.
The current vicinas del Sol.A supertierra orbits Barnard's star
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