Gliese 15 Ac

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Gliese 15 Ac
Exo-Neptune art.jpg
Artist's impression of a Neptune-type exoplanet like Gliese 15 Ac.
Discovery [1]
Discovered by Pinamonti et al.
Discovery site HARPS-N
Discovery dateApril 2018
Radial velocity
Designations
Groombridge 34 Ac, GX Andromedae c
Orbital characteristics
5.4+1.0
−0.9 AU [1]
Eccentricity 0.27+0.28
−0.19 [1]
7600+2200
−1700 d [1]
−58.40+100.80
−53.30 [1] [2]
Semi-amplitude 2.5+1.3
−1.0 [1]
Star Groombridge 34 A
Physical characteristics
Mass ≥36+25
−18 M🜨 [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]

    References

    1. 1 2 3 4 5 6 7 8 9 10 Pinamonti, M.; Damasso, M.; Marzari, F.; Sozzetti, A.; Desidera, S.; Maldonado, J.; Scandariato, G.; Affer, L.; Lanza, A. F.; Bignamini, A.; Bonomo, A. S.; Borsa, F.; Claudi, R.; Cosentino, R.; Giacobbe, P.; González-Álvarez, E.; González Hernández, J. I.; Gratton, R.; Leto, G.; Malavolta, L.; Martinez Fiorenzano, A.; Micela, G.; Molinari, E.; Pagano, I.; Pedani, M.; Perger, M.; Piotto, G.; Rebolo, R.; Ribas, I.; et al. (2018). "The HADES RV Programme with HARPS-N at TNG. VIII. GJ15A: A multiple wide planetary system sculpted by binary interaction". Astronomy and Astrophysics. 617: A104. arXiv: 1804.03476 . Bibcode:2018A&A...617A.104P. doi:10.1051/0004-6361/201732535.
    2. 1 2 "GJ 15 A c". NASA Exoplanet Archive . Archived from the original on 5 October 2023. Retrieved 1 August 2020.
    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. ↑ 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.
    5. ↑ Brennan, Pat. "Discovery Alert: 2-planet System Is Close – and Weird". NASA . Archived from the original on 28 July 2020. Retrieved 1 August 2020.


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