Gliese 15 Ac

Gliese 15 Ac
Artist's impression of a Neptune-type exoplanet like Gliese 15 Ac.
Discovery[1]
Discovered byPinamonti et al.
Discovery siteHARPS-N
Discovery dateApril 2018
Radial velocity
Designations
Groombridge 34 Ac, GX Andromedae c
Orbital characteristics
5.4+1.0
−0.9 AU[1]
Eccentricity0.27+0.28
−0.19[1]
7600+2200
−1700 d[1]
−58.40+100.80
−53.30[1][2]
Semi-amplitude2.5+1.3
−1.0[1]
StarGroombridge 34 A
Physical characteristics
Mass≥36+25
−18 ME[1]

Gliese 15 Ac (also known as Groombridge 34 Ac, GX Andromedae c) is an exoplanet orbiting the nearby red dwarf star Gliese 15 A (Groombridge 34 A, GX Andromedae), which is part of a binary star system located about 11.6 light-years[3] from the Sun. The planet was first proposed in October 2017 using radial velocity data from the CARMENES spectrograph, combined with measurements from the HARPS and HIRES spectrographs,[4] and its existence was confirmed in April 2018 using HARPS-N data.[1] It has a minimum mass 36 times that of Earth and orbits at around 5.4 astronomical units with a period of 7,600 days (21 years), an orbit which may have been sculpted by interaction with the companion star, Gliese 15 B.[1][5] As of 2020, Gliese 15 Ac is the longest-period sub-Jovian planet discovered by radial velocity.[1][2]

  1. ^ a b c d e f g h i j Cite error: The named reference Pinamonti2018 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference NASAExoplanetArchive was invoked but never defined (see the help page).
  3. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  4. ^ Cite error: The named reference Trifonov2018 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference NASA was invoked but never defined (see the help page).