Why is it in news?
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Astronomers have discovered a frozen planet with a mass over three times that of the Earth orbiting the closest solitary star to the Sun.
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The potentially rocky planet known as Barnard’s star b, is a ‘super-Earth’ and orbits around its host star once every 233 days
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The findings, show the planet lies at a distant region from the star known as the ‘snow line’
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This is well beyond the habitable zone in which liquid water, and possibly life, could exist.
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The planet’s surface temperature is estimated to be around -170°C, they said.
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However, if the planet has a substantial atmosphere the temperature could be higher and conditions potentially more hospitable
‘Infamous object’
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Barnard’s star is an infamous object among astronomers and exoplanet scientists.
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As it was one of the first stars where planets were initially claimed but later proven to be incorrect.
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At nearly six light-years away Barnard’s star is the next closest star to the Sun after the Alpha Centauri triple system.
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It is a type of faint, low-mass star called a red dwarf.
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Red dwarfs are considered to be the best places to look for exoplanet candidates, which are planets outside our solar system.
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Barnard’s star b is the second closest known exoplanet to our Sun.
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The closest lies just over four light-years from Earth.
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That exoplanet, Proxima b, orbits around the red dwarf Proxima Centauri.
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The researchers used the radial velocity method during the observations that led to the discovery of Barnard’s star b.
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This technique detects wobbles in a star which are likely to be caused by the gravitational pull of an orbiting planet.
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These wobbles affect the light coming from the star.
Source
The Hindu