 Artist's impression of a
Neptune-type exoplanet like Gliese 15 Ac. | |
| Discovery [1] | |
|---|---|
| Discovered by | Pinamonti et al. |
| Discovery site | HARPS-N |
| Discovery date | April 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 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]
References
- ^ a b c d e f g h i j 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.
- ^ a b "GJ 15 A c". NASA Exoplanet Archive. Retrieved 1 August 2020.
- ^ 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.
- ^ 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.
- ^ Brennan, Pat. "Discovery Alert: 2-planet System Is Close – and Weird". NASA. Retrieved 1 August 2020.
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