Gliese 15 Ab

Gliese 15 Ab
Exoplanet List of exoplanets
Parent star
Star Groombridge 34
Constellation Andromeda
Right ascension (α) 00h 18m 22.89s
Declination (δ) –44° 01 22.6
Apparent magnitude (mV) 8.09
Distance11.7±0.1 ly
(3.5 pc)
Spectral type M3.5 + M1.5v
Orbital elements
Semi-major axis(a) 0.0717 AU
Eccentricity (e) 0.12
Orbital period(P) 0.01 y
Physical characteristics
Minimum mass(m sin i)5.35 M
Discovery information
Discovery date August, 2014
Discoverer(s) Andrew Howard,
Discovery method HIRES
Discovery site Keck Observatory
Discovery status Published
Other designations
Gliese 15 Ab, Gl 15 Ab, GJ 15 Ab, Groombridge 34 Ab
Database references
Extrasolar Planets
Encyclopaedia
34&p2=b data
SIMBAD34+b data
Exoplanet Archive34+b data
Open Exoplanet Catalogue34+b data
Constellation of Andromeda.

Gliese 15 Ab (Gl 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, and is found in the night sky 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. Planet "b" 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.

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 (e= 0.12 +0.08/-0.06). It orbits too close to Gliese 15 A to be located in the habitable zone and is unlikely to harbour life as we know.

Notes

  1. Actually, 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. 1 2 Andrew Howard, Geoffrey Marcy, Debra A. Fischer, Howard Isaacson, Philip S. Muirhead, Gregory W. Henry, Tabetha S. Boyajian, Kaspar von Braun, 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.


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