Gliese 486

Last updated
Gliese 486 / Gar
Gliese486 SDSS9.png
Gliese 486 imaged by SDSS
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 [2]
Characteristics
Evolutionary stage main sequence
Spectral type M3.5V [3]
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]
Distance 26.351 ± 0.007  ly
(8.079 ± 0.002  pc)
Details [4]
Mass 0.3120+0.0070
−0.0069  M☉
Radius 0.3243+0.0044
−0.0034  R☉
Luminosity 0.01151+0.00047
−0.00046  L☉
Surface gravity (log g)4.9111+0.0068
−0.011  cgs
Temperature 3317+36
−37  K
Metallicity [Fe/H]−0.15+0.13
−0.12  dex
Rotation 49.9±5.5 d [5]
Rotational velocity (v sin i)<2 [6]  km/s
Age 1-8 [5]   Gyr
Other designations
Gar, GJ  486, HIP  62452, Wolf  437, TOI-1827, TYC  882-1111-1, 2MASS J12475664+0945050 [2]
Database references
SIMBAD data

Gliese 486, also known as Wolf 437 and formally named Gar, is a red dwarf star 26.4 light-years (8.1 parsecs ) away in the constellation Virgo. It hosts one known exoplanet. [7]

Contents

Nomenclature

The designation Gliese 486 comes from the Gliese Catalogue of Nearby Stars. This was the 486th star listed in the first edition of the catalogue.

In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project. [8] The approved names, proposed by a team from Spain, were announced in June 2023. Gliese 486 is named Gar and its planet is named Su, after the Basque words for "flame" and "fire". [9]

Properties

Gliese 486 has a surface temperature of 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, [10] although measurements available in 2019 did not reveal any flares. [11] The chemical makeup of the star is unremarkable and consistent with solar abundances or being slightly metal-poor. [5]

The star has an unremarkable magnetic field in the chromosphere of about 1.6 kilogauss. [6] It is rotating very slowly and is likely to be very old, belonging kinematically to the old thin disk of the Milky Way. [12]

Multiplicity surveys did not detect any stellar companions to Gliese 486 as of 2020. [13]

Planetary system

Artistic impression of the surface of the hot super-Earth Gliese 486b. Gliese486b HotSuperEarth.png
Artistic impression of the surface of the hot super-Earth Gliese 486b.
Artist's impression and size comparison of Gliese 486b and Earth. In reality, the exoplanet likely has little to no atmosphere. Gliese-486b.jpg
Artist's impression and size comparison of Gliese 486b and Earth. In reality, the exoplanet likely has little to no atmosphere.

In 2021, one planet, named Gliese 486 b, was discovered on a tight, circular orbit. [7] It represents a rare class of rocky exoplanet suitable for spectroscopic characterization in the near future [14] by the James Webb Space Telescope. [15] By 2022, no hydrogen or steam dominated atmosphere was detected, although a secondary planetary atmosphere with a higher molecular weight remained a possibility. [16] Observations by JWST announced in 2023 detected signs of water vapor, but it was unclear if this is from the planet's atmosphere or from its host star. [17] [18]

Secondary eclipse observations by JWST published in 2024 show a planetary dayside temperature of 865±14  K (592 °C; 1,097 °F). This is consistent with a lack of heat redistribution, indicating that the planet likely has little to no atmosphere and the previous water vapor detection was likely a result of contamination from the host star. Gliese 486 b is thus similar to other hot rocky planets around red dwarfs, such as LHS 3844 b, GJ 1252 b, TRAPPIST-1b, and GJ 1132 b. [4]

The Gliese 486 planetary system [4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Su2.770+0.076
−0.073  M🜨 		0.01714±0.000131.46712127+0.00000031
−0.00000035		0.00086+0.0016
−0.00043		89.39+0.41
−0.42 ° 		1.289+0.019
−0.014  R🜨

Related Research Articles

<span class="mw-page-title-main">Gliese 876</span> Star in the constellation Aquarius

Gliese 876 is a red dwarf star 15.2 light-years away from Earth in the constellation of Aquarius. It is one of the closest known stars to the Sun confirmed to possess a planetary system with more than two planets, after GJ 1061, YZ Ceti, Tau Ceti, and Wolf 1061; as of 2018, four extrasolar planets have been found to orbit the star. The planetary system is also notable for the orbital properties of its planets. It is the only known system of orbital companions to exhibit a near-triple conjunction in the rare phenomenon of Laplace resonance. It is also the first extrasolar system around a normal star with measured coplanarity. While planets b and c are located in the system's habitable zone, they are giant planets believed to be analogous to Jupiter.

<span class="mw-page-title-main">Gliese 436</span> Star in the constellation Leo

Gliese 436 is a red dwarf located 31.9 light-years away in the zodiac constellation of Leo. It has an apparent visual magnitude of 10.67, which is much too faint to be seen with the naked eye. However, it can be viewed with even a modest telescope of 2.4 in (6 cm) aperture. In 2004, the existence of an extrasolar planet, Gliese 436 b, was verified as orbiting the star. This planet was later discovered to transit its host star.

<span class="mw-page-title-main">55 Cancri e</span> Hot Super-Earth orbiting 55 Cancri A

55 Cancri e is an exoplanet orbiting a Sun-like host star, 55 Cancri A. The mass of the exoplanet is about eight Earth masses and its diameter is about twice that of the Earth. 55 Cancri e was discovered on 30 August 2004, thus making it the first super-Earth discovered around a main sequence star, predating Gliese 876 d by a year. It is the innermost planet in its planetary system, taking less than 18 hours to complete an orbit. However, until the 2010 observations and recalculations, this planet had been thought to take about 2.8 days to orbit the star.

<span class="mw-page-title-main">Gliese 436 b</span> Hot Neptune exoplanet orbiting Gliese 436

Gliese 436 b is a Neptune-sized exoplanet orbiting the red dwarf Gliese 436. It was the first hot Neptune discovered with certainty and was among the smallest-known transiting planets in mass and radius, until the much smaller Kepler exoplanet discoveries began circa 2010.

Gliese 176 is a small star with an orbiting exoplanet in the constellation of Taurus. With an apparent visual magnitude of 9.95, it is too faint to be visible to the naked eye. It is located at a distance of 30.9 light years based on parallax measurements, and is drifting further away with a heliocentric radial velocity of 26.4 km/s.

HAT-P-12 is a magnitude 13 low-metallicity K dwarf star approximately 463 light years away in the constellation Canes Venatici, which hosts one known exoplanet.

<span class="mw-page-title-main">GJ 1214 b</span> Super-Earth orbiting GJ 1214

GJ 1214 b is an exoplanet that orbits the star GJ 1214, and was discovered in December 2009. Its parent star is 48 light-years from the Sun, in the constellation Ophiuchus. As of 2017, GJ 1214 b is the most likely known candidate for being an ocean planet. For that reason, scientists often call the planet a "waterworld".

<span class="mw-page-title-main">GJ 1214</span> Star in the constellation Ophiuchus

GJ 1214 is a dim M4.5 red dwarf star in the constellation Ophiuchus with an apparent magnitude of 14.7. It is located at a distance of 47.8 light-years from Earth. GJ 1214 hosts one known exoplanet.

<span class="mw-page-title-main">GJ 1132 b</span> Terrestrial exoplanet orbiting GJ 1132

GJ 1132 b is an exoplanet orbiting GJ 1132, a red dwarf star 41 light-years from Earth, in the constellation Vela. The planet is considered uninhabitable but was thought to be cool enough to possess an atmosphere. GJ 1132 b was discovered by the MEarth-South array in Chile.

<span class="mw-page-title-main">GJ 3470 b</span> Hot Neptune orbiting GJ 3470

GJ 3470 b is an exoplanet orbiting the star GJ 3470, located in the constellation Cancer. With a mass of just under 14 Earth-masses, a radius approximately 4.3 times that of Earth's, and a high equilibrium temperature of 615 K, it is a hot Neptune.

<span class="mw-page-title-main">HIP 65426 b</span> Hot Jupiter exoplanet orbiting HIP 65426

HIP 65426 b, formally named Najsakopajk, is a super-Jupiter exoplanet orbiting the star HIP 65426. It was discovered on 6 July 2017 by the SPHERE consortium using the Spectro-Polarimetric High-Contrast Exoplanet Research (SPHERE) instrument belonging to the European Southern Observatory (ESO). It is 385 light-years from Earth. It is the first planet discovered by ESO's SPHERE instrument.

HAT-P-26 is a K-type main-sequence star located about 466 light-years away in the constellation of Virgo. A survey in 2015 did not find any stellar companions in orbit around it, although a red dwarf companion with a temperature 4000+100
−350 K is suspected on wide orbit.

GJ 3470, proper name Kaewkosin, is a red dwarf star located in the constellation of Cancer, 96 light-years away from Earth. With a faint apparent magnitude of 12.3, it is not visible to the naked eye. It hosts one known exoplanet, GJ 3470 b.

WASP-63 or Kosjenka, also known as CD-38 2551, is a single star with an exoplanetary companion in the southern constellation of Columba. It is too faint to be visible with the naked eye, having an apparent visual magnitude of 11.1. The distance to this system is approximately 942 light-years based on parallax measurements, but it is drifting closer with a radial velocity of −24 km/s.

Gliese 367 is a red dwarf star 30.7 light-years from Earth in the constellation of Vela. It is suspected to be a variable with amplitude 0.012 stellar magnitude and period 5.16 years. A stellar multiplicity survey in 2015 failed to detect any stellar companions to Gliese 367. It hosts three known exoplanets, Gliese 367 b, c & d.

Gliese 367 b, formally named Tahay, is a sub-Earth exoplanet orbiting the red dwarf star Gliese 367, 30.7 light-years from Earth in the constellation of Vela. The exoplanet takes just 7.7 hours to orbit its star, one of the shortest orbits of any planet.

LHS 3844 is a red dwarf star located 48.5 light-years away from the Solar System in the constellation of Indus. The star has about 15% the mass and 19% the radius of the Sun. It is a relatively inactive red dwarf with a slow rotation period of about 128 days, though UV flares have been observed. LHS 3844 is orbited by one known exoplanet.

L 168-9 is a red dwarf star located 82.1 light-years away from the Solar System in the constellation of Tucana. The star has about 61% the mass and 60% the radius of the Sun. It has a temperature of 3,842 K and a rotation period of 29 days. L 168-9 is orbited by one known exoplanet.

References

  1. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 "Wolf 437". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-03-10.
  3. ↑ Bozhinova, I.; Helling, Ch.; Scholz, A. (2014), "Planetary host stars: Evaluating uncertainties in cool model atmospheres", Monthly Notices of the Royal Astronomical Society, 450 (1): 160–182, arXiv: 1405.5416 , Bibcode:2015MNRAS.450..160B, doi: 10.1093/mnras/stv613
  4. 1 2 3 Mansfield, Megan Weiner; Xue, Qiao; Zhang, Michael; Mahajan, Alexandra S.; Ih, Jegug; Koll, Daniel; Bean, Jacob L.; Coy, Brandon Park; Eastman, Jason D.; Kempton, Eliza M.-R.; Kite, Edwin S.; Lunine, Jonathan (2024). "No Thick Atmosphere on the Terrestrial Exoplanet GI 486b". arXiv: 2408.15123 .
  5. 1 2 3 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
  6. 1 2 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
  7. 1 2 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
  8. ↑ "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Archived from the original on 8 March 2023. Retrieved 27 August 2022.
  9. ↑ "2022 Approved Names". nameexoworlds.iau.org. IAU. Archived from the original on 1 May 2024. Retrieved 7 June 2023.
  10. ↑ 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
  11. ↑ 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
  12. ↑ 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
  13. ↑ 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
  14. ↑ "Hot Super-Earth Discovered 26 Light-Years Away". Archived from the original on 2021-12-09. Retrieved 2021-03-10.
  15. ↑ "Newfound exoplanet could be 'Rosetta Stone' for studies of alien atmospheres". Space.com . 4 March 2021. Archived from the original on 2023-03-30. Retrieved 2021-03-10.
  16. ↑ 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 (2023), "High-resolution Transmission Spectroscopy of the Terrestrial Exoplanet GJ 486b", The Astronomical Journal, 165 (4): 170, arXiv: 2212.11816 , Bibcode:2023AJ....165..170R, doi: 10.3847/1538-3881/acbd39
  17. ↑ 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". The Astrophysical Journal Letters . 948 (1): L11. arXiv: 2305.00868 . Bibcode:2023ApJ...948L..11M. doi: 10.3847/2041-8213/accb9c .
  18. ↑ "Webb Finds Water Vapor, But From a Rocky Planet or Its Star?". webbtelescope.org. STScI. 1 May 2023. Archived from the original on 2 May 2023. Retrieved 1 May 2023.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.