Astronomy:LHS 3844
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas/yr Dec.: −726.986[2] mas/yr |
| Parallax (π) | 67.2123 ± 0.0187[2] mas |
| Distance | 48.53 ± 0.01 ly (14.878 ± 0.004 pc) |
| Absolute magnitude (MV) | 14.39±0.02[3] |
| Details[3] | |
| Mass | 0.151±0.014 M☉ |
| Radius | 0.189±0.006 R☉ |
| Luminosity (bolometric) | 0.00272±0.0004 L☉ |
| Surface gravity (log g) | 5.06±0.01 cgs |
| Temperature | 3036±77 K |
| Rotation | 128±24 d |
| Age | 7.8±1.6[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.
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]
| 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
- ↑ "Finding the constellation which contains given sky coordinates". 2 August 2008. http://djm.cc/constellation.html.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 Vanderspek, Roland et al. (February 2019). "TESS Discovery of an Ultra-short-period Planet around the Nearby M Dwarf LHS 3844" (in en). The Astrophysical Journal Letters 871 (2): L24. doi:10.3847/2041-8213/aafb7a. Bibcode: 2019ApJ...871L..24V.
- ↑ 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. doi:10.3847/PSJ/abaab5. Bibcode: 2020PSJ.....1...36K.
- ↑ "LHS 3844". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LHS+3844.
- ↑ Diamond-Lowe, Hannah (July 2021). "The High-energy Spectrum of the Nearby Planet-hosting Inactive Mid-M Dwarf LHS 3844". The Astronomical Journal 162 (1): 10. doi:10.3847/1538-3881/abfa1c. Bibcode: 2021AJ....162...10D.
- ↑ "List of ExoWorlds 2022". IAU. 8 August 2022. https://www.nameexoworlds.iau.org/2022exoworlds.
- ↑ "2022 Approved Names". IAU. https://www.nameexoworlds.iau.org/2022approved-names.
- ↑ 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.
- ↑ 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. doi:10.3847/1538-3881/abaf4f. Bibcode: 2020AJ....160..188D.
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