L 98-59 b

Last updated
L 98-59 b
L98-59b.png
Artist's impression
Discovery
Discovery date2018 [1]
Transit [1]
Orbital characteristics
0.0227 AU [1]
Eccentricity 0.09 [1]
2.2532 d [1]
Star L 98-59
Physical characteristics
Mean radius
0.85 R🜨 [2]
Mass 0.40 MEarth [2]
Temperature 603 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]

    Related Research Articles

    <span class="mw-page-title-main">Proxima Centauri</span> Star in the constellation Centaurus

    Proxima Centauri is a small, low-mass star located 4.2465 light-years (1.3020 pc) away from the Sun in the southern constellation of Centaurus. Its Latin name means the 'nearest [star] of Centaurus'. It was discovered in 1915 by Robert Innes and is the nearest-known star to the Sun. With a quiescent apparent magnitude of 11.13, it is too faint to be seen with the unaided eye. Proxima Centauri is a member of the Alpha Centauri star system, being identified as component Alpha Centauri C, and is 2.18° to the southwest of the Alpha Centauri AB pair. It is currently 12,950 AU (0.2 ly) from AB, which it orbits with a period of about 550,000 years.

    Pi Mensae, also known as HD 39091, is a yellow dwarf star in the constellation of Mensa. This star has a high proper motion. The apparent magnitude is 5.67, which can be visible to the naked eye in exceptionally dark, clear skies. It is nearly 60 light-years away. The star is slightly larger than the Sun in terms of mass, size, luminosity, temperature and metallicity, and is about 730 million years younger. It hosts three known planets.

    <span class="mw-page-title-main">Planet Hunters</span> Citizen science project to find exoplanets

    Planet Hunters is a citizen science project to find exoplanets using human eyes. It does this by having users analyze data from the NASA Kepler space telescope and the NASA Transiting Exoplanet Survey Satellite. It was launched by a team led by Debra Fischer at Yale University, as part of the Zooniverse project.

    <span class="mw-page-title-main">Proxima Centauri b</span> Terrestrial planet orbiting Proxima Centauri

    Proxima Centauri b, sometimes referred to as Alpha Centauri Cb, is an exoplanet orbiting within the habitable zone of the red dwarf star Proxima Centauri, which is the closest star to the Sun and part of the larger triple star system Alpha Centauri. It is about 4.2 ly (1.3 pc) from Earth in the constellation Centaurus, making it and Proxima d, along with the currently-disputed Proxima c, the closest known exoplanets to the Solar System.

    <span class="mw-page-title-main">Proxima Centauri c</span> Exoplanet candidate orbiting Proxima Centauri

    Proxima Centauri c is a controversial exoplanet candidate claimed to be orbiting the red dwarf star Proxima Centauri, which is the closest star to the Sun and part of a triple star system. It is located approximately 4.2 light-years from Earth in the constellation of Centaurus, making it, Proxima b, and Proxima d the closest known exoplanets to the Solar System.

    TOI-700 is a red dwarf 101.4 light-years away from Earth located in the Dorado constellation that hosts TOI-700 d, the first Earth-sized exoplanet in the habitable zone discovered by the Transiting Exoplanet Survey Satellite (TESS).

    <span class="mw-page-title-main">TOI-700 d</span> Goldilocks terrestrial planet orbiting TOI-700

    TOI-700 d is a near-Earth-sized exoplanet, likely rocky, orbiting within the habitable zone of the red dwarf TOI-700, the outermost planet within the system. It is located roughly 101.4 light-years (31.1 pc) away from Earth in the constellation of Dorado. The exoplanet is the first Earth-sized exoplanet in the habitable zone discovered by the Transiting Exoplanet Survey Satellite (TESS).

    L 98-59 is a bright M dwarf star, located in the constellation of Volans, at a distance of 10.608 parsecs, as measured by Gaia.

    References

    1. 1 2 3 4 5 "The Extrasolar Planet Encyclopaedia-L 98-59 b". Extrasolar Planets Encyclopaedia . 1995.
    2. 1 2 3 4 5 Demangeon, Oliver D. S.; Zapatero Osorio, M. R.; Alibert, Y.; Barros, S. C. C.; Adibekyan, V.; Tabernero, H. M.; et al. (July 2021). "A warm terrestrial planet with half the mass of Venus transiting a nearby star" (PDF). Astronomy & Astrophysics. 653: 38. arXiv: 2108.03323 . Bibcode:2021A&A...653A..41D. doi:10.1051/0004-6361/202140728. S2CID   236957385.
    3. 1 2 "Canicule ? Il fait 330 degrés sur la petite exoplanète découverte par le télescope spatial TESS". Numerama (in French). 2019-07-01. Retrieved 2019-07-30.
    4. 1 2 Garner, Rob (2019-06-24). "NASA's TESS Mission Finds Its Smallest Planet Yet". NASA. Retrieved 2019-06-29.
    5. ↑ 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. arXiv: 2110.12079 . Bibcode:2022AJ....163..151S. doi: 10.3847/1538-3881/ac32e3 . ISSN   0004-6256. S2CID   239768873.
    6. ↑ Faria, J. P.; Suárez Mascareño, A.; et al. (January 4, 2022). "A candidate short-period sub-Earth orbiting Proxima Centauri" (PDF). Astronomy & Astrophysics. European Southern Observatory. 658: 17. arXiv: 2202.05188 . Bibcode:2022A&A...658A.115F. doi: 10.1051/0004-6361/202142337 .
    7. ↑ Damiano, Mario; Hu, Renyu; Barclay, Thomas; Zieba, Sebastian; Kreidberg, Laura; Brande, Jonathan; Colon, Knicole D.; Covone, Giovanni; Crossfield, Ian; Domagal-Goldman, Shawn D.; Fauchez, Thomas J.; Fiscale, Stefano; Gallo, Francesco; Gilbert, Emily; Hedges, Christina L.; Kite, Edwin S.; Kopparapu, Ravi K.; Kostov, Veselin B.; Morley, Caroline; Mullally, Susan E.; Pidhorodetska, Daria; Schlieder, Joshua E.; Quintana, Elisa V. (2022), "A Transmission Spectrum of the Sub-Earth Planet L98-59 b in 1.1–1.7 μm", The Astronomical Journal, 164 (5): 225, arXiv: 2210.10008 , Bibcode:2022AJ....164..225D, doi: 10.3847/1538-3881/ac9472 , S2CID   252968265
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