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LSR J1835+3259 is a nearby ultracool dwarf[6] of spectral class M8.5,[2] located in constellation Lyra, the discovery of which was published in 2003.[2][3] Previously it was concluded that this star is a young brown dwarf,[5] but no lithium absorption lines are detected for this object, which is a strong indicator for young brown dwarfs that need 10-100 million years to deplete lithium.[6]

LSR J1835+3259

Artist's impression of LSR J1835+3259 and its aurorae.
Credit: Chuck Carter and Gregg Hallinan/Caltech
Observation data
Epoch J2000[1]      Equinox J2000[1]
Constellation Lyra
Right ascension 18h 35m 37.902s[1]
Declination +32° 59′ 54.59″[1]
Characteristics
Spectral type M8.5[2]
Apparent magnitude (V (USNO filter system)) 18.27 ± 0.03[2]
Apparent magnitude (I (USNO filter system)) 13.46 ± 0.02[2]
Apparent magnitude (z (USNO filter system)) 12.63 ± 0.02[2]
Apparent magnitude (J (2MASS filter system)) 10.27 ± 0.03[2]
Apparent magnitude (H (2MASS filter system)) 9.58 ± 0.05[2]
Apparent magnitude (Ks (2MASS filter system)) 9.15 ± 0.04[2]
Astrometry
Radial velocity (Rv)-10 ± 40[3] km/s
Proper motion (μ) RA: −72.650±0.047[4] mas/yr
Dec.: −755.146±0.052[4] mas/yr
Parallax (π)175.7930 ± 0.0468 mas[4]
Distance18.553 ± 0.005 ly
(5.689 ± 0.002 pc)
Details
Mass55 ± 4[5] MJup
Radius2.1 ± 0.1[5] RJup
Surface gravity (log g)4.5 ± 0.05[5] cgs
Temperature2800 ± 30[5] K
Age22 ± 4[5] Myr
Other designations
2MASSI J1835379+325954,[2] 2MASS 1835+32,[2] 2MASS J18353790+3259545,[1] LSR 1835+3259,[3] 2MUCD 11792,[1] [B2006] J183537.9+325955,[1] LSPM J1835+3259,[1] USNO-B1.0 1229-00376318[1]
Database references
SIMBADdata
LSR J1835+3259
Location of LSR J1835+3259 in the constellation Lyra

Distance


Trigonometric parallax of this object, measured in 2001–2002 with the USNO 61 inch (1.5 m) reflector under US Naval Observatory (USNO) parallax program, is 0.1765 ± 0.0005 arcsec, corresponding to a distance of 5.67 ± 0.02 pc, or 18.48 ± 0.05 ly.[2]


Characteristics


The first potential extrasolar auroras detected occurred in the atmosphere of LSR J1835+3259. They were found in July 2015 by the Karl G. Jansky Very Large Array in New Mexico by analyzing the emitted radio waves. The potential auroras were probably 1 million times brighter than those ever observed on Earth.[7] The optical emission is mainly red in colour, because the charged particles are interacting with hydrogen in its atmosphere. It is not known what the cause is. Some have speculated that material may be being stripped off the surface of the brown dwarf via stellar winds to produce its own electrons. Another possible explanation is an as-yet-undetected planet or moon around the dwarf, which is throwing off material to light it up, as is the case with Jupiter and its moon Io.[8]


References


  1. "2MASS J18353790+3259545 -- Brown Dwarf (M<0.08solMass)". Centre de Données astronomiques de Strasbourg. Retrieved 2011-10-16.
  2. Reid, I. Neill; Cruz; Laurie; Liebert; Dahn; Harris; Guetter; Stone; Canzian; Luginbuhl; Levine; Monet; Monet (2003). "Meeting the Cool Neighbors. IV. 2MASS 1835+32, a Newly Discovered M8.5 Dwarf within 6 Parsecs of the Sun". The Astronomical Journal. 125 (1): 354–358. Bibcode:2003AJ....125..354R. doi:10.1086/344946.
  3. Lepine, Sebastien; Rich; Shara (2003). "Spectroscopy of New High Proper Motion Stars in the Northern Sky. I. New Nearby Stars, New High-Velocity Stars, and an Enhanced Classification Scheme for M Dwarfs". The Astronomical Journal. 125 (3): 1598–1622. arXiv:astro-ph/0209284. Bibcode:2003AJ....125.1598L. doi:10.1086/345972. S2CID 2697331.
  4. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  5. Berdyugina, S. V.; Harrington, D. M.; Kuzmychov, O.; Kuhn, J. R.; Hallinan, G.; Kowalski, A. F.; Hawley, S. L. (September 2017). "First Detection of a Strong Magnetic Field on a Bursty Brown Dwarf: Puzzle Solved". Astrophysical Journal. 847 (1): 61. arXiv:1709.02861. Bibcode:2017ApJ...847...61B. doi:10.3847/1538-4357/aa866b. ISSN 0004-637X. S2CID 118904301.
  6. Saur, Joachim; Fischer, Christian; Wennmacher, Alexandre; Feldman, Paul D.; Roth, Lorenz; Strobel, Darrell F.; Reiners, Ansgar (May 2018). "The UV Spectrum of the Ultracool Dwarf LSR J1835+3259 Observed with the Hubble Space Telescope". Astrophysical Journal. 859 (1): 74. arXiv:1804.01165. Bibcode:2018ApJ...859...74S. doi:10.3847/1538-4357/aabb55. ISSN 0004-637X. S2CID 56408309.
  7. O'Neill, Ian (July 29, 2015). "Monstrous Aurora Detected Beyond our Solar System". news.discovery.com. Discovery. Retrieved July 29, 2015.
  8. Q. Choi, Charles (July 29, 2015). "First Alien Auroras Found, Are 1 Million Times Brighter Than Any On Earth". space.com. Retrieved July 29, 2015.



На других языках

[de] LSR J1835+3259

LSR J1835+3259, 2MASSI J1835379+325954 oder 2M1835+32 ist ein Brauner Zwerg der Spektralklasse M8.5 im Sternbild Leier. Der Braune Zwerg ist etwa 5,67 Parsec von der Erde entfernt.[1]
- [en] LSR J1835+3259


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