Astronomy:Gliese 15 Ac
 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] |
| Orbital period | 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Pinamonti, M.; Damasso, M.; Marzari, F.; Sozzetti, A.; Desidera, S.; Maldonado, J.; Scandariato, G.; Affer, L. 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. doi:10.1051/0004-6361/201732535. Bibcode: 2018A&A...617A.104P.
- ↑ 2.0 2.1 "GJ 15 A c". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=GJ+15+A+c&type=CONFIRMED_PLANET. Retrieved 1 August 2020.
- ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. 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 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. doi:10.1051/0004-6361/201731442. Bibcode: 2018A&A...609A.117T.
- ↑ Brennan, Pat. "Discovery Alert: 2-planet System Is Close – and Weird". https://exoplanets.nasa.gov/news/1606/discovery-alert-2-planet-system-is-close-and-weird/. Retrieved 1 August 2020.
fr:Gliese 15#Les planètes GJ 15 Ab et GJ 15 Ac
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