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DENIS 0255−4700 is an extremely faint brown dwarf approximately 16 light years from the Solar System in the southern constellation of Eridanus.[1][6] It is the closest isolated L brown dwarf (no undiscovered L-dwarfs are expected to be closer), and only after the binary Luhman 16. It is also the faintest brown dwarf (with the absolute magnitude of MV=24.44) having measured visible magnitude.[7] A number of nearer T and Y-type dwarfs are known, specifically WISE 0855−0714, Epsilon Indi B and C, SCR 1845-6357 B, DEN 1048−3956, and UPGS 0722−05.

DENIS 0255−4700

Artist's impression of an L-dwarf
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 02h 55m 03.579s[1]
Declination −47° 00′ 50.99″[1]
Characteristics
Spectral type L8/L9[2]
Apparent magnitude (V) ~22.9[1]
Apparent magnitude (R) ~20.1[1]
Apparent magnitude (I) ~17.2[1]
Apparent magnitude (J) ~13.2[1]
Astrometry
Proper motion (μ) RA: 1053 ± 11[1] mas/yr
Dec.: −547 ± 6[1] mas/yr
Parallax (π)205.4251 ± 0.1857 mas[3]
Distance15.88 ± 0.01 ly
(4.868 ± 0.004 pc)
Absolute magnitude (MV)24.44
Details
Mass0.025–0.065[2] M☉
Radius0.08–0.1[2] R☉
Luminosity0.0000154[4] L☉
Temperature~1300[2] K
Rotation1.7 hours[5]
Rotational velocity (v sin i)40.8±8.0[5] km/s
Age0.3–10[2] Gyr
Other designations
2MUCD 10158,
DENIS-P J025503.3−470049,
2MASS J02550357−4700509,
DENIS-P J025503.5−470050,
DENIS-P J0255.0−4700,
2MASSI 0255035−470050
Database references
SIMBADdata
DENIS 0255−4700
Location of DENIS 0255−4700 in the constellation Eridanus

History of observations


DENIS 0255−4700 was identified for the first time as a probable nearby object in 1999.[6] Its proximity to the Solar System was established by the RECONS group in 2006 when its trigonometric parallax was measured.[7] DENIS 0255-4700 has a relatively small tangential velocity of 27.0 ± 0.5 km/s.[2]


Properties


The photospheric temperature of DENIS 0255−4700 is estimated at about 1300 K.[2] Its atmosphere in addition to hydrogen and helium contains water vapor, methane and possibly ammonia.[8] The mass of DENIS 0255−4700 lies in the range from 25 to 65 Jupiter masses corresponding to the age range from 0.3 to 10 billion years.[2] The brown dwarf is rotating rapidly with the period of 1.7 hours, and its rotational axis is inclined 40 degrees from the line-of-sight.[5]


See also



References


  1. "2MUCD 10158 – Brown Dwarf (M<0.08 M☉)". Centre de données astronomiques de Strasbourg. Retrieved 2009-12-14.
  2. Stephens, Denise C.; Leggett, Sandy K.; Cushing, Michael C.; Marley, Mark S.; Saumon, Didier; Geballe, Thomas R.; Golimowski, David A.; Fan, Xiaohui; Noll, Keith S. (2009). "The 0.8–14.5 μm Spectra of Mid-L to Mid-T Dwarfs: Diagnostics of Effective Temperature, Grain Sedimentation, Gas Transport, and Surface Gravity". The Astrophysical Journal. 702 (1): 154–170. arXiv:0906.2991. Bibcode:2009ApJ...702..154S. doi:10.1088/0004-637X/702/1/154. S2CID 118650774.
  3. 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.
  4. CARMENES input catalogue of M dwarfs V. Luminosities, colours, and spectral energy distributions
  5. Spectroscopic rotational velocities of brown dwarfs, 2006, arXiv:astro-ph/0603194
  6. "Discovery of the Nearest L Dwarf: the Intrinsically Faintest Object at Visual Wavelengths Known Beyond our Solar System". RECONS. Retrieved 2007-06-17.
  7. Costa, E.; Méndez, R. A.; Jao, W. -C.; Henry, T. J.; Subasavage, J. P.; Ianna, P. A. (2006). "The Solar Neighborhood. XVI. Parallaxes from CTIOPI: Final Results from the 1.5 m Telescope Program". The Astronomical Journal. 132 (3): 1234. Bibcode:2006AJ....132.1234C. CiteSeerX 10.1.1.622.2310. doi:10.1086/505706.
  8. Cushing, Michael C. (2006). "Spitzer Space Telescope Observations of M, L, and T Dwarfs". ASP Conference Series. 357: 66–67. Bibcode:2006ASPC..357...66C.

Notes





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    На других языках

    [de] DENIS-P J0255−4700

    DENIS-P J0255−4700 ist ein Brauner Zwerg der Spektralklasse L9 im Sternbild Eridanus. Er wurde 1999 von Eduardo L. Martín et al. entdeckt. Seine Position verschiebt sich aufgrund seiner Eigenbewegung jährlich um 1154,121 Millibogensenkunden. Er befindet sich in einer Entfernung von knapp 16 Lichtjahren zur Erde.
    - [en] DENIS 0255−4700

    [ru] DEN 0255-4700

    DEN 0255-4700 — очень тусклый коричневый карлик в созвездии Эридана.


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