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Gliese 15 Ab (GJ 15Ab), also commonly called Groombridge 34 Ab,[note 1] is an extrasolar planet approximately 11 light-years away in the constellation of Andromeda. 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]

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Gliese 15 Ab

Discovery
Discovered by	Andrew W. Howard
Discovery site	Keck Observatory
Discovery date	August, 2014
Detection method	Radial velocity
Orbital characteristics
Semi-major axis	0.074±0.001 AU
Eccentricity	0.093+0.152 −0.010
Orbital period (sidereal)	11.441+0.004 −0.002 d
Star	Groombridge 34A
Physical characteristics
Mass	> 3.03 MEarth[1]

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_Earth.[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.

Notes

References

External links

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

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