Gliese 832 b

Gliese 832 b

Discovery[1]
Discovered by	Bailey et al.
Discovery site	Anglo-Australian Observatory
Discovery date	September 1, 2008
Detection method	Doppler spectroscopy
Orbital characteristics[2]
Semi-major axis	3.53+0.15 −0.16 AU
Eccentricity	0.069+0.026 −0.027
Orbital period (sidereal)	3609+124 −121 d 9.88+0.34 −0.33 yr
Inclination	54.9°+6.6° −4.9° or 125.1°+4.9° −6.6°
Longitude of ascending node	41.0°+77.0° −23.0°
Time of periastron	2457470+327 −294
Argument of periastron	213.0°±33.0°
Star	Gliese 832
Physical characteristics[2]
Mass	0.8+0.12 −0.11 MJ

Gliese 832 b (Gl 832 b or GJ 832 b) is a gas giant exoplanet about 80% the mass of Jupiter, located 16.2 light-years from the Sun in the constellation of Grus, orbiting the red dwarf star Gliese 832.^[3]

Orbit

The planet takes 9.88 years to revolve around its star at an orbital distance of 3.5 AU;^[2] at the time of discovery, this was the longest-period Jupiter-like planet known orbiting a red dwarf.^[1] The brightness of the faint parent star at that distance corresponds to the brightness of the Sun from 80 AU (or 100 times brighter than a full Moon as seen from Earth).

Discovery

The planet was discovered at the Anglo-Australian Observatory on September 1, 2008. It would induce an astrometric perturbation on its star of at least 0.95 milliarcseconds and is thus a good candidate for being detected by astrometric observations. Despite its relatively large angular distance, direct imaging is problematic due to the star–planet contrast.^[1] Gliese 832 b was confirmed and its parameters updated by subsequent studies in 2011,^[4] 2014,^[5] and 2022.^[6] In 2023, an astrometric detection of the planet was announced, determining its inclination and revealing a true mass 80% the mass of Jupiter.^[2]

References

1. Bailey, Jeremy; et al. (2008). "A Jupiter-like Planet Orbiting the Nearby M Dwarf GJ832". The Astrophysical Journal. 690 (1): 743–747. arXiv:0809.0172. Bibcode:2009ApJ...690..743B. doi:10.1088/0004-637X/690/1/743. S2CID 17172233.
2. Xiao, Guang-Yao; Liu, Yu-Juan; et al. (March 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics. arXiv:2303.12409.
3. Wall, Mike (June 25, 2014). "Nearby Alien Planet May Be Capable of Supporting Life". Space.com. Archived from the original on July 12, 2018. Retrieved July 1, 2014.
4. Bonfils, Xavier; Delfosse, Xavier; Udry, Stéphane; Forveille, Thierry; Mayor, Michel; Perrier, Christian; Bouchy, François; Gillon, Michaël; Lovis, Christophe; Pepe, Francesco; Queloz, Didier; Santos, Nuno C.; Ségransan, Damien; Bertaux, Jean-Loup (2011). "The HARPS search for southern extra-solar planets XXXI. The M-dwarf sample". Astronomy and Astrophysics. 549: A109. arXiv:1111.5019. Bibcode:2013A&A...549A.109B. doi:10.1051/0004-6361/201014704. S2CID 119288366.
5. Wittenmyer, R.A.; Tuomi, M.; Butler, R.P.; Jones, H. R. A.; Anglada-Escude, G.; Horner, J.; Tinney, C.G.; Marshall, J.P.; Carter, B.D.; et al. (2014). "GJ 832c: A super-earth in the habitable zone". The Astrophysical Journal. 1406 (2): 5587. arXiv:1406.5587. Bibcode:2014ApJ...791..114W. doi:10.1088/0004-637X/791/2/114. S2CID 12157837.
6. Gorrini, P.; Astudillo-Defru, N.; et al. (August 2022). "Detailed stellar activity analysis and modelling of GJ 832: Reassessment of the putative habitable zone planet GJ 832c". Astronomy & Astrophysics. 664: A64. arXiv:2206.07552. Bibcode:2022A&A...664A..64G. doi:10.1051/0004-6361/202243063. S2CID 249674385.

External links

• "GJ 832". Exoplanets. Archived from the original on 2009-11-25. Retrieved 2008-10-11.