LHS 2065

Last updated
LHS 2065
LHS2065LightCurve.png
Light curves showing four flares on LHS 2065, plotted from TESS data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Hydra [2]
Right ascension 08h 53m 36.16047s [3]
Declination −03° 29 32.1975 [3]
Apparent magnitude  (V)+18.959 [4]
Characteristics
Evolutionary stage main sequence [5]
Spectral type M9V [5]
Variable type Flare star [6]
Astrometry
Radial velocity (Rv)7±2 [7] km/s
Proper motion (μ)RA: −516.605 mas/yr [3]
Dec.: −199.652 mas/yr [3]
Parallax (π)115.4876±0.0726  mas [3]
Distance 28.24 ± 0.02  ly
(8.659 ± 0.005  pc)
Details
Mass 0.082±0.002 [8]   M
Radius 0.113±0.006 [8]   R
Luminosity 3.39+0.16
−0.15
×10−4
[9]   L
Surface gravity (log g)~5.5 [9]   cgs
Temperature 2,317+61
−56
[8]   K
Age >0.5 [6]   Gyr
Other designations
GJ 3517, LHS 2065, LP 666-9, TIC 7975441, 2MASS J08533619-0329321 [10]
Database references
SIMBAD data

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. [8] It is one of the few ultracool dwarfs known to have flare activity, emitting one flare every 33 hours, [6] and is also an active X-ray emitter. [5]

Parallax measurements by the Gaia spacecraft give a distance of 8.66 parsecs (28.2 ly) to LHS 2065. [3] 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. [11] It is located in the Hydra constellation. [2]

This star has a spectral type of M9V, [5] indicating a very cool star at the end of the main sequence. It is among the nearest ultracool dwarfs to Earth. [6] LHS 2065 has an effective temperature of around 2,317 K, [8] 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. [6]

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.
  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.