LHS 2065

LHS 2065

Light curves showing four flares on LHS 2065, plotted from TESS data
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 08h 53m 36.16047s
Declination −03° 29′ 32.1975″
Apparent magnitude (V) +18.959
Characteristics
Evolutionary stage main sequence
Spectral type M9V
Variable type Flare star
Astrometry
Radial velocity (Rv)7±2 km/s
Proper motion (μ) RA: −516.605 mas/yr
Dec.: −199.652 mas/yr
Parallax (π)115.4876±0.0726 mas
Distance28.24 ± 0.02 ly
(8.659 ± 0.005 pc)
Details
Mass0.082±0.002 M☉
Radius0.113±0.006 R☉
Luminosity3.39+0.16
−0.15×10−4 L☉
Surface gravity (log g)~5.5 cgs
Temperature2,317+61
−56 K
Age>0.5 Gyr
Other designations
GJ 3517, LHS 2065, LP 666-9, TIC 7975441, 2MASS J08533619-0329321
Database references
SIMBADdata

LHS 2065 is a red dwarf star, one of the smallest stars ever found with around 8.2% the mass of the Sun and a diameter only 10% greater than Jupiter. It is one of the few ultracool dwarfs known to have flare activity, emitting one flare every 33 hours, and is also an active X-ray emitter.

Parallax measurements by the Gaia spacecraft give a distance of 8.66 parsecs (28.2 ly) to LHS 2065. This star was first recorded by the Luyten Half-Second catalogue, a catalogue of stars with proper motions exceeding 0.5". The star's main identifier is named after this catalogue. It is located in the constellation Hydra.

This star has a spectral type of M9V, indicating a very cool star on the main sequence. It is among the nearest ultracool dwarfs to Earth. LHS 2065 has an effective temperature of around 2,317 K, 2.5 times less than the Sun. The lack of lithium in the star's atmosphere indicate that it must be over 500 million years old.

See also

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 23 September 2024.
  2. 1 2 Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  3. 1 2 3 4 5 6 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.
  4. ↑ Costa, Edgardo; Méndez, René A.; Jao, W. -C.; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Ianna, Philip A.; Bartlett, Jennifer (2005). "The Solar Neighborhood. XIV. Parallaxes from the Cerro Tololo Inter-American Observatory Parallax Investigation-First Results from the 1.5 m Telescope Program". The Astronomical Journal. 130 (1): 337. Bibcode:2005AJ....130..337C. doi:10.1086/430473. hdl:10533/176842.
  5. 1 2 3 4 Robrade, J.; Schmitt, J. H. M. M. (2008-09-01). "Quiescent X-ray emission from the M9 dwarf LHS 2065". Astronomy & Astrophysics. 487 (3): 1139–1141. arXiv:0806.3863. Bibcode:2008A&A...487.1139R. doi:10.1051/0004-6361:200810142. ISSN 0004-6361.
  6. 1 2 3 4 5 Martín, Eduardo L.; Ardila, David R. (2001-05-01). "Flares at the Cool End of the M Dwarfs: The Case of LHS 2065". The Astronomical Journal. 121 (5): 2758–2760. Bibcode:2001AJ....121.2758M. doi:10.1086/320412. ISSN 0004-6256.
  7. ↑ Burgasser, Adam J.; Logsdon, Sarah E.; Gagné, Jonathan; Bochanski, John J.; Faherty, Jaqueline K.; West, Andrew A.; Mamajek, Eric E.; Schmidt, Sarah J.; Cruz, Kelle L. (2015). "The Brown Dwarf Kinematics Project (BDKP). IV. Radial Velocities of 85 Late-M and L Dwarfs with MagE". The Astrophysical Journal Supplement Series. 220 (1): 18. arXiv:1507.00057. Bibcode:2015ApJS..220...18B. doi:10.1088/0067-0049/220/1/18.
  8. 1 2 3 4 5 Pineda, J. Sebastian; et al. (September 2021). "The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars". The Astrophysical Journal. 918 (1): 23. arXiv:2106.07656. Bibcode:2021ApJ...918...40P. doi:10.3847/1538-4357/ac0aea. S2CID 235435757. 40.
  9. 1 2 Sanghi, Aniket; Liu, Michael C.; Best, William M. J.; Dupuy, Trent J.; Siverd, Robert J.; Zhang, Zhoujian; Hurt, Spencer A.; Magnier, Eugene A.; Aller, Kimberly M.; Deacon, Niall R. (2023-12-06). "The Hawaii Infrared Parallax Program. VI. The Fundamental Properties of 1000+ Ultracool Dwarfs and Planetary-mass Objects Using Optical to Mid-infrared Spectral Energy Distributions and Comparison to BT-Settl and ATMO 2020 Model Atmospheres". The Astrophysical Journal. 959 (1): 63. Bibcode:2023AAS...24120311S. doi:10.3847/1538-4357/acff66. ISSN 0004-637X. Note: See Zenodo tables
  10. ↑ "LHS 2065". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-09-09.
  11. ↑ Luyten, Willem J. (1979-01-01). LHS catalogue. A catalogue of stars with proper motions exceeding 0"5 annually. Bibcode:1979lccs.book.....L.