The motion of a star as it makes its way through the galaxy has led to the discovery of a new alien world.
Using data from the Gaia spacecraft that's mapping the Milky Way, astronomers detected a kink in the motion of a star named HIP-99770, suggesting the presence of a nearby planet.
"Performing both direct imaging and astrometry allows us to gain a full understanding of an exoplanet for the first time: measure its atmosphere, weigh it, and track its orbit all at once,"of the Subaru Telescope and the University of Texas at San Antonio. The second is to look for changes in the wavelength of a star's light known as Doppler shifts as it moves about the mutual center of orbit it shares with the exoplanet.
Several stars showed evidence of a snaking wiggle that could be evidence of the presence of a giant exoplanet. The Subaru Telescope and the Keck Observatory in Hawai'i were put to work, looking for these worlds directly. And they snared a big one on one of the first stars they looked at.HIP-99770b is an exoplanet between 14 and 16 times the mass and 1.05 times the radius of, orbiting a star twice the mass of the Sun at a distance of 17 astronomical units.
France Dernières Nouvelles, France Actualités
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