LHS 3844

LHS 3844 is a red dwarf star located 48.5 light-years (14.9 pc) 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
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
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

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.[7][8]

In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[9]

The LHS 3844 planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ~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) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. 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. 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.
  8. 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.
  9. "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.
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