Gliese 486

Gliese 486, also known as Wolf 437, is a red dwarf star in the constellation Virgo. Its surface temperature is 3340±54 K. Gliese 486 is similar to the Sun in its concentration of heavy elements, with a metallicity Fe/H index of 0.07±0.16. It was suspected to be a flare star,[7] although measurements available in 2019 did not reveal any flares.[8] The chemical makeup of the star is unremarkable and consistent with solar abundances or being slightly metal-poor.[4]

Gliese 486

Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 12h 47m 56.62457s[1]
Declination +09° 45′ 05.0357″[1]
Apparent magnitude (V) 11.395
Characteristics
Evolutionary stage main sequence
Spectral type M3.5V[2]
Astrometry
Radial velocity (Rv)19.20±0.17[1] km/s
Proper motion (μ) RA: −1008.267 mas/yr[1]
Dec.: −460.034 mas/yr[1]
Parallax (π)123.7756 ± 0.0329 mas[1]
Distance26.351 ± 0.007 ly
(8.079 ± 0.002 pc)
Details[3]
Mass0.323±0.015 M☉
Radius0.328±0.011 R☉
Luminosity0.01210±0.00023 L☉
Temperature3340±54 K
Metallicity [Fe/H]−0.15±0.13[4] dex
Rotation49.9±5.5 d[4]
Rotational velocity (v sin i)<2[5] km/s
Age1-8[4] Gyr
Other designations
GJ 486, HIP 62452, Wolf 437, TOI-1827, TYC 882-1111-1, 2MASS J12475664+0945050[6]
Database references
SIMBADdata

The star has an unremarkable magnetic field in the chromosphere of about 1.6 kilogauss.[5] It is rotating very slowly and is likely to be very old, belonging kinematically to the old thin disk of the Milky Way.[9]

Multiplicity surveys did not detect any stellar companions to Gliese 486 as of 2020.[10]

Planetary system
Artistic impression of the surface of the hot super-Earth Gliese 486b.

In 2021, one planet, named Gliese 486 b, was discovered on a tight, circular orbit.[3] It represents a rare class of rocky exoplanet suitable for spectroscopic characterization in the near future[11] by the James Webb Space Telescope.[12] As of 2022, no hydrogen or steam dominated atmosphere was detected, although a secondary planetary atmosphere with a higher molecular weight remains a possibility.[13] Observations by JWST announced in 2023 detected signs of water vapor, but it is unclear if this is from the planet's atmosphere or from its host star.[14][15]

In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[16]

The Gliese 486 planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 2.82+0.11
−0.12 M🜨		 0.01734+0.00026
−0.00027		 1.467119+0.000031
−0.000030		 <0.05 88.4+1.1
−1.4°		 1.305+0.063
−0.067 R🜨

References
  1. Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
  2. Bozhinova, I.; Helling, Ch.; Scholz, A. (2014), "Planetary host stars: Evaluating uncertainties in cool model atmospheres", Monthly Notices of the Royal Astronomical Society, 450: 160–182, arXiv:1405.5416, Bibcode:2015MNRAS.450..160B, doi:10.1093/mnras/stv613
  3. Trifonov, T.; et al. (2021), "A nearby transiting rocky exoplanet that is suitable for atmospheric investigation", Science, 371 (6533): 1038–1041, arXiv:2103.04950, Bibcode:2021Sci...371.1038T, doi:10.1126/science.abd7645, PMID 33674491, S2CID 232124642
  4. Caballero, J. A.; et al. (2022), "A detailed analysis of the Gl 486 planetary system", Astronomy & Astrophysics, 665: A120, arXiv:2206.09990, Bibcode:2022A&A...665A.120C, doi:10.1051/0004-6361/202243548, S2CID 249889232
  5. Moutou, Claire; Hébrard, Élodie M.; Morin, Julien; Malo, Lison; Fouqué, Pascal; Torres-Rivas, Andoni; Martioli, Eder; Delfosse, Xavier; Artigau, Étienne; Doyon, René (2017), "SPIRou input catalogue: Activity, rotation and magnetic field of cool dwarfs", Monthly Notices of the Royal Astronomical Society, 472 (4): 4563–4586, arXiv:1709.01650, Bibcode:2017MNRAS.472.4563M, doi:10.1093/mnras/stx2306
  6. "Wolf 437". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-03-10.
  7. O'Donoghue, D.; Koen, C.; Kilkenny, D.; Stobie, R. S.; Koester, D.; Bessell, M. S.; Hambly, N.; MacGillivray, H. (2003), "The DA+d Me eclipsing binary EC13471-1258: its cup runneth over ... Just", Monthly Notices of the Royal Astronomical Society, 345 (2): 506–528, arXiv:astro-ph/0307144, Bibcode:2003MNRAS.345..506O, doi:10.1046/j.1365-8711.2003.06973.x, S2CID 17408072
  8. Vida, Krisztián; Leitzinger, Martin; Kriskovics, Levente; Seli, Bálint; Odert, Petra; Kovács, Orsolya Eszter; Korhonen, Heidi; Van Driel-Gesztelyi, Lidia (2019), "The quest for stellar coronal mass ejections in late-type stars", Astronomy & Astrophysics, 623: A49, arXiv:1901.04229, doi:10.1051/0004-6361/201834264, S2CID 119095055
  9. Browning, Matthew K.; Basri, Gibor; Marcy, Geoffrey W.; West, Andrew A.; Zhang, Jiahao (2010), "Rotation and Magnetic Activity in a Sample of M-Dwarfs", The Astronomical Journal, 139 (2): 504, Bibcode:2010AJ....139..504B, doi:10.1088/0004-6256/139/2/504, S2CID 121835145
  10. Lamman, Claire; Baranec, Christoph; Berta-Thompson, Zachory K.; Law, Nicholas M.; Schonhut-Stasik, Jessica; Ziegler, Carl; Salama, Maïssa; Jensen-Clem, Rebecca; Duev, Dmitry A.; Riddle, Reed; Kulkarni, Shrinivas R.; Winters, Jennifer G.; Irwin, Jonathan M. (2020), "Robo-AO M-dwarf Multiplicity Survey: Catalog", The Astronomical Journal, 159 (4): 139, arXiv:2001.05988, Bibcode:2020AJ....159..139L, doi:10.3847/1538-3881/ab6ef1, S2CID 210718832
  11. Hot Super-Earth Discovered 26 Light-Years Away
  12. Newfound exoplanet could be 'Rosetta Stone' for studies of alien atmospheres
  13. Ridden-Harper, Andrew; Nugroho, Stevanus; Flagg, Laura; Jayawardhana, Ray; Turner, Jake D.; Ernst de Mooij; MacDonald, Ryan; Deibert, Emily; Tamura, Motohide; Kotani, Takayuki; Hirano, Teruyuki; Kuzuhara, Masayuki; Omiya, Masashi; Kusakabe, Nobuhiko (2022), High-Resolution Transmission Spectroscopy of the Terrestrial Exoplanet GJ 486b, arXiv:2212.11816
  14. Moran, Sarah E.; Stevenson, Kevin B.; et al. (May 2023). "High Tide or Rip-Tide on the Cosmic Shoreline? A Water-Rich Atmosphere or Stellar Contamination for the Warm Super-Earth GJ 486b from JWST Observations" (PDF). The Astrophysical Journal Letters. arXiv:2305.00868.
  15. "Webb Finds Water Vapor, But From a Rocky Planet or Its Star?". webbtelescope.org. STScI. 1 May 2023. Retrieved 1 May 2023.
  16. "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.