Gliese 15 Ab

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Gliese 15 Ab
Discovery
Discovered by
Discovery siteKeck Observatory
Discovery dateAugust, 2014
Radial velocity
Orbital characteristics
0.074±0.001 AU
Eccentricity0.093+0.152
−0.010
11.441+0.004
−0.002 d
StarGroombridge 34A

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″.[1]

It was discovered in August 2014,[2] 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,[2] 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.[3]

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[]

  1. ^ In the discovery paper, discoverers call this object "Gl 15 Ab", and never "Groombridge 34 Ab".

References[]

  1. ^ F. van Leeuwen (2007) Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2): 653–664.
  2. ^ a b Andrew Howard, Geoffrey Marcy, Debra A. Fischer, Howard Isaacson, Philip S. Muirhead, Gregory W. Henry, Tabetha S. Boyajian, , Juliette C. Becker, Jason T. Wright, John Asher Johnson, Astrophysics Earth and Planetary Astrophysics : The NASA-UC-UH Eta-Earth Program: IV. A Low-mass Planet Orbiting an M Dwarf 3.6 PC from Earth.
  3. ^ Trifonov, Trifon; Kürster, Martin; Zechmeister, Mathias; Tal-Or, Lev; Caballero, José A.; Quirrenbach, Andreas; Amado, Pedro J.; Ribas, Ignasi; Reiners, Ansgar; et al. (2018). "The CARMENES search for exoplanets around M dwarfs. First visual-channel radial-velocity measurements and orbital parameter updates of seven M-dwarf planetary systems". Astronomy and Astrophysics. 609. A117. arXiv:1710.01595. Bibcode:2018A&A...609A.117T. doi:10.1051/0004-6361/201731442. S2CID 119340839.

External links[]



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