Astronomy:L 98-59 b

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Short description: Terrestrial planet orbiting L 98-59
L 98-59 b
L98-59b.png
Artist's impression
Discovery
Discovery date2018[1]
Transit[1]
Orbital characteristics
0.0227 AU[1]
Eccentricity0.09[1]
Orbital period2.2532 d[1]
StarL 98-59
Physical characteristics
Mean radius0.85 R⊕[2]
Mass0.40 M⊕[2]
Physics603 K (330°C)[3]

L 98-59 b is an exoplanet having a size between that of the Earth and Mars and a mass only half that of Venus.[2] It orbits L 98-59, a red dwarf 35 light-years away in the constellation Volans. There are at least 3 (possibly 4) other planets in the system: L 98-59 c, d, e, and the unconfirmed L 98-59 f.[2] Its discovery was announced on 27 June 2019 on the NASA website. It was the smallest planet discovered by TESS[4] until the discovery of LHS 1678b,[5] and was the lowest-mass planet whose mass has been measured using radial velocities[2] until Proxima Centauri d was found in 2022.[6]

Characteristics

L 98-59 b orbits in 2.25 days and stays so close to the star that it receives 22 times more energy than Earth receives from the Sun. There are 4 confirmed planets in the system but they are not in the habitable zone of the host star.[4] The temperature of the planet detected by TESS is 330 °C.[3] In 2022, transmission spectroscopy has indicated that the planet has either no atmosphere or opaque atmosphere with the high-altitude hazes.[7]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 "The Extrasolar Planet Encyclopaedia-L 98-59 b". Extrasolar Planets Encyclopaedia. 1995. https://exoplanet.eu/catalog/l_98_59_b--6861/. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Demangeon, Oliver D. S.Expression error: Unrecognized word "etal". (July 2021). "A warm terrestrial planet with half the mass of Venus transiting a nearby star". Astronomy & Astrophysics 653: 38. doi:10.1051/0004-6361/202140728. Bibcode: 2021A&A...653A..41D. https://www.eso.org/public/archives/releases/sciencepapers/eso2112/eso2112a.pdf. 
  3. ↑ 3.0 3.1 "Canicule ? Il fait 330 degrés sur la petite exoplanète découverte par le télescope spatial TESS" (in fr). 2019-07-01. https://www.numerama.com/sciences/530111-canicule-il-fait-330-degres-sur-la-petite-exoplanete-decouverte-par-le-telescope-spatial-tess.html. 
  4. ↑ 4.0 4.1 Garner, Rob (2019-06-24). "NASA's TESS Mission Finds Its Smallest Planet Yet" (in en). http://www.nasa.gov/feature/goddard/2019/nasa-s-tess-mission-finds-its-smallest-planet-yet. 
  5. ↑ Silverstein, Michele L.; Schlieder, Joshua E.; Barclay, Thomas; Hord, Benjamin J.; Jao, Wei-Chun; Vrijmoet, Eliot Halley; Henry, Todd J.; Cloutier, Ryan et al. (2022-04-01). "The LHS 1678 System: Two Earth-Sized Transiting Planets and an Astrometric Companion Orbiting an M Dwarf Near the Convective Boundary at 20 pc". The Astronomical Journal 163 (4): 151. doi:10.3847/1538-3881/ac32e3. ISSN 0004-6256. Bibcode: 2022AJ....163..151S. 
  6. ↑ Faria, J. P.; Suárez Mascareño, A. et al. (January 4, 2022). "A candidate short-period sub-Earth orbiting Proxima Centauri". Astronomy & Astrophysics (European Southern Observatory) 658: 17. doi:10.1051/0004-6361/202142337. Bibcode: 2022A&A...658A.115F. https://www.eso.org/public/archives/releases/sciencepapers/eso2202/eso2202a.pdf. 
  7. ↑ Damiano, Mario; Hu, Renyu; Barclay, Thomas; Zieba, Sebastian; Kreidberg, Laura; Brande, Jonathan; Colon, Knicole D.; Covone, Giovanni et al. (2022), "A Transmission Spectrum of the Sub-Earth Planet L98-59 b in 1.1–1.7 μm", The Astronomical Journal 164 (5): 225, doi:10.3847/1538-3881/ac9472, Bibcode: 2022AJ....164..225D 



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