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Gliese 15 Ab

Planet orbiting Gliese 15 A

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Gliese 15 Ab (GJ 15 Ab), also commonly called Groombridge 34 Ab,^{[note 1]} rarely called GX Andromedae b is an extrasolar planet approximately 11 light-years away in the constellationofAndromeda. It is found in the night sky orbiting the star Gliese 15 A, which is at right ascension 00h 18m 22.89s and declination +44°01′ 22.6″.^[2]

It was discovered in August 2014,^[3] deduced from analysis of the radial velocities of the parent star by the Eta-Earth Survey using HIRES at Keck Observatory. It has around 5.35 ± 0.75 Earth masses,^[3] and is thought to be a Super-Earth with a diameter greater than that of the Earth. However, researches using the CARMENES spectrograph failed to detect the planet in 2017.^[4] The detection of planet was recovered in 2018, with revised minimum mass of 3.03 M_E.^[1]

Gliese 15 Ab has a close inner orbit around Gliese 15 A with a semi-major axis of only 0.0717 ± 0.0034 AU, making an orbital period that is just a little longer than 11.4 days, the orbit appears to be relatively circular, with an orbital eccentricity of about 0.12. It orbits too close to Gliese 15 A to be located in the habitable zone and is unlikely to harbour life.

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External links[edit]

• Open Exoplanet Catalogue entry Archived 2019-04-16 at the Wayback Machine

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