Astronomy:GJ 1289

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Short description: Red dwarf
GJ 1289
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda[1]
Right ascension  23h 43m 06.31184s[2]
Declination +36° 32′ 13.1373″[2]
Apparent magnitude (V) 12.67[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type M4.5Ve[3]
Astrometry
Radial velocity (Rv)−3.85±0.41[2] km/s
Proper motion (μ) RA: +941.841[2] mas/yr
Dec.: −151.272[2] mas/yr
Parallax (π)119.5794 ± 0.0563[2] mas
Distance27.28 ± 0.01 ly
(8.363 ± 0.004 pc)
Details
Mass0.21±0.02[4] M☉
Radius0.233±0.005[4] R☉
Luminosity0.0054[5] L☉
Surface gravity (log g)5.06±0.05[4] cgs
Temperature3296±30[4] K
Metallicity [Fe/H]0.02±0.10[4] dex
Rotation73.66±0.92 d[6]
Rotational velocity (v sin i)2.0[7] km/s
Age2.6[8] Gyr
Other designations
GJ 1289, G 130-4, LHS 4003, NLTT 57748, TYC 2779-1797-1[3]
Database references
SIMBADdata
Exoplanet Archivedata

GJ 1289 is a red dwarf star located approximately 27 light-years from the Sun in the constellation Andromeda. It is a single star of spectral class M4.5 V, with about 21% of the Sun's mass. The star hosts at least one confirmed exoplanet, GJ 1289 b, and is fully convective, making it a target for studying planetary formation around low-mass stars.[6] Despite its slow rotation, GJ 1289 exhibits large-scale magnetic field strengths similar to those of faster-rotating M dwarfs, suggesting that the star operates a dynamo process in a regime distinct from more rapidly rotating stars.[9][4] The star is predominantly poloidal with its magnetic topology varying over time, and their small-scale fields contribute more than 70% of the star's overall magnetic flux.[10]

The GJ 1289 planetary system[6]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥6.27+1.23
−1.25 M⊕ 		0.27±0.01 111.74+0.73
−0.71 		0 — —

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 "GJ 1289". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+1289. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Cristofari, P. I.; Donati, J. -F.; Moutou, C.; Lehmann, L. T.; Charpentier, P.; Fouqué, P.; Folsom, C. P.; Masseron, T. et al. (2023), "Measuring small-scale magnetic fields of 44 M dwarfs from SPIRou spectra with ZeeTurbo", Monthly Notices of the Royal Astronomical Society 526 (4): 5648, doi:10.1093/mnras/stad3144, Bibcode: 2023MNRAS.526.5648C 
  5. ↑ Ment, Kristo; Charbonneau, David (2023). "The Occurrence Rate of Terrestrial Planets Orbiting Nearby Mid-to-late M Dwarfs from TESS Sectors 1-42". The Astronomical Journal 165 (6): 265. doi:10.3847/1538-3881/acd175. Bibcode: 2023AJ....165..265M. 
  6. ↑ 6.0 6.1 6.2 Moutou, C.; Ould-Elhkim, M.; Donati, J.-F.; Charpentier, P.; Cadieux, C.; Delfosse, X.; Artigau, E.; Arnold, L. et al. (2024-08-12). "Characterising planetary systems with SPIRou: Temperate sub-Neptune exoplanet orbiting the nearby fully convective star GJ 1289 and a candidate around GJ 3378". Astronomy & Astrophysics 688: A196. doi:10.1051/0004-6361/202450466. ISSN 0004-6361. Bibcode: 2024A&A...688A.196M. 
  7. ↑ Jeffers, S. V.; Barnes, J. R.; Schöfer, P.; Reffert, S.; Béjar, V. J. S.; Quirrenbach, A.; Reiners, A.; Shan, Y. et al. (2025). "The CARMENES search for exoplanets around M dwarfs: Understanding the wavelength dependence of radial velocity measurements". Astronomy and Astrophysics 696. doi:10.1051/0004-6361/202347510. Bibcode: 2025A&A...696A..27J. 
  8. ↑ Mann, Andrew W.; Feiden, Gregory A.; Gaidos, Eric; Boyajian, Tabetha; von Braun, Kaspar (2015). "How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius". The Astrophysical Journal 804 (1): 64. doi:10.1088/0004-637X/804/1/64. Bibcode: 2015ApJ...804...64M. 
  9. ↑ Lehmann, L T; Donati, J-F; Fouqué, P; Moutou, C; Bellotti, S; Delfosse, X; Petit, P; Carmona, A et al. (2023-11-09). "SPIRou reveals unusually strong magnetic fields of slowly rotating M dwarfs" (in en). Monthly Notices of the Royal Astronomical Society 527 (2): 4330–4352. doi:10.1093/mnras/stad3472. ISSN 0035-8711. 
  10. ↑ Moutou, C.; Hébrard, E. M.; Morin, J.; Malo, L.; Fouqué, P.; Torres-Rivas, A.; Martioli, E.; Delfosse, X. et al. (2017-12-21). "SPIRou input catalogue: activity, rotation and magnetic field of cool dwarfs" (in en). Monthly Notices of the Royal Astronomical Society 472 (4): 4563–4586. doi:10.1093/mnras/stx2306. ISSN 0035-8711. 



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