Gliese 367 b

Gliese 367 b is an exoplanet orbiting the red dwarf star Gliese 367 (GJ 367), 31 light-years (9.5 parsecs) from Earth in the constellation of Vela.[3] The exoplanet takes just 7.7 hours to orbit its star, one of the shortest orbits of any planet.[1] Due to its close orbit, the exoplanet gets bombarded with radiation 500 times more than Earth receives from the Sun. Dayside temperatures on GJ 367b are around 1,500 °C (1,770 K; 2,730 °F).[4]

Gliese 367 b
Discovery[1]
Discovered byKristine Lam, et al.
Discovery siteTESS
Discovery dateDecember 2021
Transit
Designations
TOI-731.01
Orbital characteristics[1]
0.0071±0.0002 AU
Eccentricity0
0.321962+0.000010
−0.000012 d
Inclination80.75°±0.64°
Semi-amplitude0.798±0.110 m/s
StarGliese 367
Physical characteristics
Mean radius
0.718±0.054 R🜨[1]
~0.75 R🜨[2]
Mass0.546±0.078 M🜨[1]
~0.48 M🜨[2]
Mean density
8.106±2.165 g/cm3[1]
~6.2 g/cm3[2]
Temperature1745±43 K[1]

    Due to its close orbit, it most likely is tidally locked. The atmosphere of Gliese 367 b, due to the extreme temperatures, would have boiled away along with signs of life. The core of GJ 367b is likely composed of iron and nickel, making its core similar to Mercury's core. The core of GJ 367b is extremely dense, making up most of the planet's mass.[5]

    As of 2022, Gliese 367 b is the smallest known exoplanet within 10 parsecs of the Solar System,[6] and the second-least massive after Proxima Centauri d.

    In August 2022, this planet and its host star were included among 20 systems to be named by the third NameExoWorlds project.[7]

    References
    1. Lam, Kristine W. F.; Csizmadia, Szilárd; Astudillo-Defru, Nicola; Bonfils, Xavier; Gandolfi, Davide; Padovan, Sebastiano; Esposito, Massimiliano; Hellier, Coel; Hirano, Teruyuki; Livingston, John; Murgas, Felipe (2021-12-03). "GJ 367b: A dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star". Science. 374 (6572): 1271–1275. arXiv:2112.01309. Bibcode:2021Sci...374.1271L. doi:10.1126/science.aay3253. PMID 34855492. S2CID 244799656.
    2. Brandner, Wolfgang; Calissendorff, Per; Frankel, Neige; Cantalloube, Faustine (2022). "High-contrast, high-angular resolution view of the GJ 367 exoplanet system". Monthly Notices of the Royal Astronomical Society. 513 (1): 661–669. arXiv:2204.02998. Bibcode:2022MNRAS.513..661B. doi:10.1093/mnras/stac961.
    3. Witze, Alexandra (2021-12-02). "This tiny iron-rich world is extraordinarily metal". Nature. doi:10.1038/d41586-021-03587-z. PMID 34857947. S2CID 244846974.
    4. Mann, Adam (2021-12-02). "Metal Planet Orbits Its Star Every 7.7 Hours". The New York Times. ISSN 0362-4331. Retrieved 2021-12-05.
    5. Hellier, Coel. "A new exoplanet: meet GJ 367b, an iron planet smaller and denser than Earth". The Conversation. Retrieved 2021-12-05.
    6. "Planetary Systems Composite Data". NASA Exoplanet Archive. Retrieved 7 December 2021.
    7. "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.
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