Astronomy:LHS 3844 b
 Artist’s illustration of LHS 3844 b | |
| Discovery[1] | |
|---|---|
| Discovered by | Vanderspek et al. |
| Discovery date | September 2018 |
| Transit | |
| Designations | |
| Kua'kua,[2] TOI-136.01, TIC 410153553 b[3][4] | |
| Orbital characteristics | |
| 0.00622±0.00017 AU[3][4] | |
| Orbital period | 0.46292913±0.00000190 d[3][4] |
| Inclination | 88.50±0.51[4] |
| Star | LHS 3844 |
| Physical characteristics | |
| Mean radius | 1.303±0.022 R⊕[3][4] |
| Albedo | <0.2[5] |
| Physics | 1,040 K (770 °C; 1,410 °F) (day side)[5] |
LHS 3844 b, formally named Kua'kua,[2] is an exoplanet orbiting the red dwarf LHS 3844, about 48.5 light-years (14.9 parsecs) away in the constellation Indus,[6] discovered using the Transiting Exoplanet Survey Satellite. It orbits its parent star once every 11 hours, and its radius is 1.32 times that of Earth.[1] It has a low albedo, indicating that its surface may resemble that of the Moon or Mercury. LHS 3844 b probably does not have an atmosphere as almost no heat goes to its night side, and it has a dayside temperature of 1,040 K (770 °C; 1,410 °F).[5][7] The presence of cloudy atmosphere with cloud tops above pressure level of 0.1 bar cannot be excluded though.[8]
In order to explain the lack of atmosphere, it has been proposed that the planet was formed interior to the star system's snow-line, because if it formed beyond the snow-line it would have carried volatiles, on the surface and in a thick atmosphere, that according to models on atmospheric loss should have been enough to sustain an atmosphere to the present.[9] The planet probably also formed with a volatile-poor outgassing mantle, in a stagnant lid regime, because if the mantle was similar in constitution to Earth's, with plate tectonics, then it should still have a thick atmosphere, unless the red dwarf consistently flared at an uncharacteristically extreme rate not yet considered in atmospheric loss models.[9] An alternative explanation for the lack of atmosphere could be through a large impact event, one with enough momentum to strip the planet of its atmosphere and a large portion of its mantle.[9] In order to explain the non replenishment of volatiles via comets back onto the planet, it is also proposed that perhaps there is an outer gas giant in the star system.[9]
Naming
In August 2022, this planet and its host star were included among 20 systems to be named by the third NameExoWorlds project.[6] The approved names, proposed by a team from Costa Rica, were announced in June 2023. LHS 3844 b is named Kua'kua and its host star is named Batsũ̀, after the Bribri words for "butterfly" and "hummingbird".[2]
See also
References
- ↑ 1.0 1.1 Team, the TESS; Villaseñor, Jesus Noel S.; Twicken, Joseph D.; Rose, Mark; Morgan, Edward H.; Pepper, Joshua; Glidden, Ana W.; Fausnaugh, Michael et al. (2018-09-19). "TESS Discovery of an ultra-short-period planet around the nearby M dwarf LHS 3844" (in en). The Astrophysical Journal 871 (2): L24. doi:10.3847/2041-8213/aafb7a. Bibcode: 2019ApJ...871L..24V.
- ↑ 2.0 2.1 2.2 "2022 Approved Names". IAU. https://www.nameexoworlds.iau.org/2022approved-names.
- ↑ 3.0 3.1 3.2 3.3 "The Extrasolar Planet Encyclopaedia — LHS 3844 b". Extrasolar Planets Encyclopaedia. 1995. https://exoplanet.eu/catalog/lhs_3844_b--6827/.
- ↑ 4.0 4.1 4.2 4.3 4.4 "LHS 3844 b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=LHS+3844+b&type=CONFIRMED_PLANET. Retrieved 23 July 2020.
- ↑ 5.0 5.1 5.2 Kreidburg, Laura (August 2019). "Absence of a thick atmosphere on the terrestrial exoplanet LHS 3844b". Nature 573 (7772): 87–90. doi:10.1038/s41586-019-1497-4. PMID 31427764. Bibcode: 2019Natur.573...87K.
- ↑ 6.0 6.1 "List of ExoWorlds 2022". IAU. 8 August 2022. https://www.nameexoworlds.iau.org/2022exoworlds.
- ↑ Greicius, Tony (2019-08-19). "NASA Gets a Rare Look at a Rocky Exoplanet's Surface". http://www.nasa.gov/feature/jpl/nasa-gets-a-rare-look-at-a-rocky-exoplanets-surface.
- ↑ Diamond-Lowe, Hannah; Charbonneau, David; Malik, Matej; Kempton, Eliza M.-R.; Beletsky, Yuri (2020), "Optical Transmission Spectroscopy of the Terrestrial Exoplanet LHS 3844b from 13 Ground-based Transit Observations", The Astronomical Journal 160 (4): 188, doi:10.3847/1538-3881/abaf4f, Bibcode: 2020AJ....160..188D
- ↑ 9.0 9.1 9.2 9.3 Kane, Stephen R.; Roettenbacher, Rachael M.; Unterborn, Cayman T.; Foley, Bradford J.; Hill, Michelle L. (2020-07-28). "A Volatile-poor Formation of LHS 3844b Based on Its Lack of Significant Atmosphere". The Planetary Science Journal 1 (2): 36. doi:10.3847/PSJ/abaab5. Bibcode: 2020PSJ.....1...36K.Accepted for publication in the Planetary Science Journal
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