L 98-59 b explained

L 98-59 b
Mean Radius:0.85
Mass:0.40
Single Temperature:603 K (330°C)
Discovery Method:Transit[1]
Discovered:2018
Star:L 98-59
Semimajor:0.0227 AU
Eccentricity:0.09
Period:2.2532 d

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. 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[3] until the discovery of LHS 1678b,[4] and was the lowest-mass planet whose mass has been measured using radial velocities until Proxima Centauri d was found in 2022.[5]

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.[6] The temperature of the planet detected by TESS is 330 °C.[7] In 2022, transmission spectroscopy has indicated that the planet has either no atmosphere or opaque atmosphere with the high-altitude hazes.

Notes and References

  1. Web site: The Extrasolar Planet Encyclopaedia-L 98-59 b. 1995 . Extrasolar Planets Encyclopaedia.
  2. etal . Oliver D. S. . Demangeon . M. R. . Zapatero Osorio . Y. . Alibert . S. C. C. . Barros . V. . Adibekyan . H. M. . Tabernero . A warm terrestrial planet with half the mass of Venus transiting a nearby star . July 2021 . Astronomy & Astrophysics . 653 . 38 . 10.1051/0004-6361/202140728. 2108.03323 . 2021A&A...653A..41D . 236957385 .
  3. Web site: Garner. Rob. 2019-06-24. NASA's TESS Mission Finds Its Smallest Planet Yet. 2019-06-29. NASA. en.
  4. Silverstein . Michele L. . Schlieder . Joshua E. . Barclay . Thomas . Hord . Benjamin J. . Jao . Wei-Chun . Vrijmoet . Eliot Halley . Henry . Todd J. . Cloutier . Ryan . Kostov . Veselin B. . Kruse . Ethan . Winters . Jennifer G. . Irwin . Jonathan M. . Kane . Stephen R. . Stassun . Keivan G. . Huang . Chelsea . 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 . 10.3847/1538-3881/ac32e3 . 2110.12079 . 2022AJ....163..151S . 239768873 . 0004-6256 . free .
  5. Faria . J. P. . Suárez Mascareño . A. . Figueira . P. . Silva . A. M. . Damasso . M. . Demangeon . O. . Pepe . F. . Santos . N. C. . Rebolo . R. . Cristiani . S. . Adibekyan . V. . 2 . January 4, 2022 . A candidate short-period sub-Earth orbiting Proxima Centauri . Astronomy & Astrophysics . European Southern Observatory . 658 . 17 . 2202.05188 . 2022A&A...658A.115F . 10.1051/0004-6361/202142337 . free . Tabernero . Lo Curto . X. . Ehrenreich . D. . González Hernández . J. I. . Hara . Cabral . J. . G. . Lovis . G. . P. . C. . Martins . C. J. A. P. . Mégevand . D. . Mehner . A. . Micela . N. . Dumusque . Di Marcantonio . N. J. . S. . Pallé . E. . Poretti . E. . Sousa . S. G. . Sozzetti . A. . Udry . A. . P. . Zapatero Osorio . V. . M. R. . S. C. C. . Barros . R. . Allart . Y. . Alibert . Nunes . Molaro . D’Odorico . Lillo-Box . H..
  6. Web site: Garner. Rob. 2019-06-24. NASA's TESS Mission Finds Its Smallest Planet Yet. 2019-06-29. NASA. en.
  7. Web site: 2019-07-01. Canicule ? Il fait 330 degrés sur la petite exoplanète découverte par le télescope spatial TESS. 2019-07-30. Numerama. fr.

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