LHS 3844

LHS 3844 is a red dwarf star located 48.5 light-years (14.9 parsecs) away from the Solar System in the constellation of Indus. The star has about 15% the mass and 19% the radius of the Sun.[3] It is a relatively inactive red dwarf with a slow rotation period of about 128 days, though UV flares have been observed.[6] LHS 3844 is orbited by one known exoplanet.

LHS 3844 / Batsũ̀
Observation data
Epoch J2000      Equinox J2000
Constellation Indus[1]
Right ascension 22h 41m 58.11718s[2]
Declination −69° 10′ 08.3207″[2]
Apparent magnitude (V) 15.26±0.03[3]
Characteristics
Evolutionary stage Main sequence
Spectral type M4.5-M5[3]
Apparent magnitude (V) 15.26±0.03[3]
Apparent magnitude (G) 13.365±0.003[2]
Apparent magnitude (J) 10.046±0.023[3]
Apparent magnitude (H) 9.477±0.023[3]
Apparent magnitude (K) 9.145±0.023[3]
Astrometry
Radial velocity (Rv)−9.90±0.76[2] km/s
Proper motion (μ) RA: 334.419 mas/yr[2]
Dec.: −726.986 mas/yr[2]
Parallax (π)67.2123 ± 0.0187 mas[2]
Distance48.53 ± 0.01 ly
(14.878 ± 0.004 pc)
Absolute magnitude (MV)14.39±0.02[3]
Details[3]
Mass0.151±0.014 M☉
Radius0.189±0.006 R☉
Luminosity (bolometric)0.00272±0.0004 L☉
Surface gravity (log g)5.06±0.01 cgs
Temperature3036±77 K
Rotation128±24 d
Age7.8±1.6[4] Gyr
Other designations
Batsũ̀, L 119-213, LFT 1732, LHS 3844, NLTT 54534, TOI-136, TIC 410153553, 2MASS J22415815-6910089, WISEA J224158.77-691015.9[5]
Database references
SIMBADdata

Nomenclature

The designation LHS 3844 comes from one of Luyten's catalogues of stars with high proper motion.

In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[7] The approved names, proposed by a team from Costa Rica, were announced in June 2023. LHS 3844 is named Batsũ̀ and its planet is named Kua'kua, after the Bribri words for "hummingbird" and "butterfly".[8]

Planetary system

The exoplanet LHS 3844 b was discovered in 2018 using TESS.[3] It is a terrestrial planet larger than Earth with an orbital period of less than a day, and likely does not have an atmosphere. Its low albedo suggests that its surface may resemble that of the Moon or Mercury.[9][10]

The LHS 3844 planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Kua'kua ~2.25 M🜨 0.00622±0.00017 0.46292913±0.0000019 — 88.50±0.51° 1.303±0.022 R🜨

References
  1. "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008. Retrieved 27 August 2022.
  2. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. Vanderspek, Roland; et al. (February 2019). "TESS Discovery of an Ultra-short-period Planet around the Nearby M Dwarf LHS 3844". The Astrophysical Journal Letters. 871 (2): L24. arXiv:1809.07242. Bibcode:2019ApJ...871L..24V. doi:10.3847/2041-8213/aafb7a. S2CID 119009146.
  4. Kane, Stephen R.; et al. (September 2020). "A Volatile-poor Formation of LHS 3844b Based on Its Lack of Significant Atmosphere". The Planetary Science Journal. 1 (2): 36. arXiv:2007.14493. Bibcode:2020PSJ.....1...36K. doi:10.3847/PSJ/abaab5. S2CID 220845575.
  5. "LHS 3844". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 27 August 2022.
  6. Diamond-Lowe, Hannah; et al. (July 2021). "The High-energy Spectrum of the Nearby Planet-hosting Inactive Mid-M Dwarf LHS 3844". The Astronomical Journal. 162 (1): 10. arXiv:2104.10522. Bibcode:2021AJ....162...10D. doi:10.3847/1538-3881/abfa1c.
  7. "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.
  8. "2022 Approved Names". nameexoworlds.iau.org. IAU. Retrieved 7 June 2023.
  9. Kreidburg, Laura; et al. (August 2019). "Absence of a thick atmosphere on the terrestrial exoplanet LHS 3844b". Nature. 573 (7772): 87–90. arXiv:1908.06834. Bibcode:2019Natur.573...87K. doi:10.1038/s41586-019-1497-4. PMID 31427764. S2CID 256819677.
  10. Diamond-Lowe, Hannah; et al. (October 2020). "Optical Transmission Spectroscopy of the Terrestrial Exoplanet LHS 3844b from 13 Ground-based Transit Observations". The Astronomical Journal. 160 (4): 188. arXiv:2008.05444. Bibcode:2020AJ....160..188D. doi:10.3847/1538-3881/abaf4f. S2CID 221103928.
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