2MASS J04151954−0935066

Coordinates: Sky map 04h 15m 19.54s, −09° 35′ 06.6″
Source: Wikipedia, the free encyclopedia.
2MASS J04151954−0935066
2MASS 0415−0935
The brown dwarf 2MASS J04151954−0935066 seen by JWST
Credit: 2MASS
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 04h 15m 19.54s
Declination −09° 35′ 06.6″
Characteristics
Spectral type T8V
Apparent magnitude (Y) 16.438 ± 0.009[1]
Apparent magnitude (J) 15.343 ± 0.004[1]
Apparent magnitude (H) 15.666 ± 0.012[1]
Apparent magnitude (Ks) 15.658 ± 0.023[1]
Distance
18.6 ± 0.2 ly
(5.71 ± 0.06 pc)
Details
Gyr
2MASSW
J0415195−093506
Database references
SIMBADdata
2MASS 0415−0935 is located in the constellation Eridanus
2MASS 0415−0935 is located in the constellation Eridanus
2MASS 0415−0935
Location of 2MASS 0415−0935 in the constellation Eridanus

2MASS J04151954−0935066 (also abbreviated to 2MASS 0415−0935) is a

spectral class T8,[2][4] in the constellation Eridanus about 18.6 light-years from Earth. [2] This is a reference (standard) object for the definition of the T8 spectral class.[5]

Discovery

2MASS 0415−0935 was discovered in 2002 by Adam J. Burgasser et al. from

Keck I 10 m telescope, and nearinfrared camera D78, mounted on the Palomar 5 m Hale Telescope. In 2002 Burgasser et al. published a paper, where they defined new spectral subtypes T1—T8, and presented discovery of 11 new T-type brown dwarfs, among which also was 2MASS 0415−0935 — object of the latest known by the time spectral type T8. These 11 objects were among the earliest T-type brown dwarfs ever discovered: before this, the total number of known T-type objects was 13, and these discoveries increased it up to 24 (apart from additional T-type dwarfs, identified by Geballe et al. 2001 in SDSS data).[6]

Distance

Currently the most precise distance estimate of 2MASS 0415−0935 is published in 2012 by Dupuy & Liu

U.S. Naval Observatory Infrared Astrometry Program, was published in 2004 by Vrba et al.[7]

Space motion

Position of 2MASS 0415−0935 shifts due to its

arcseconds per year (2.2782 ± 0.0012 arcsec, according to Dupuy & Liu (2012)[2]
).

Properties

2MASS 0415-0935 belongs to the spectral class T8V; its surface temperature is about 750 kelvins. As with other brown dwarfs of spectral type T, its spectrum was thought to be dominated by methane, although by 2015 with the improved spectroscopic database many of the spectral lines were re-assigned to water.[5] The Research Consortium On Nearby Stars (RECONS) estimates the brown dwarf to be 0.03 solar masses.[8]

2MASS 0415-0935 was observed with NIRSpec on JWST. The observation constrained the abundances of water vapor (H2O), methane (CH4), carbon monoxide (CO), carbon dioxide (CO2) and ammonia (NH4). The abundance of hydrogen sulfide (H2S) was less well constrained and phosphine (PH3) was not detected, but an upper limit of its abundance was measured. The 12CO/13CO ratio is 97+9
−8, which is similar for 2MASS J03552337+1133437 and similar to the ratio in the sun. It was shown that the current models of vertical mixing that predict the abundances of different molecules are inconsistent with measured abundances of carbon dioxide. 2MASS 0415-0935 joins a number of T and Y-dwarfs with missing phosphine, such as WISE 0359−5401, requiring a major revision of phosphorus chemistry in brown dwarfs and possibly giant planets.[3]

See also

The other 10 brown dwarfs, presented in Burgasser et al. (2002):[6]

References

  1. ^
    S2CID 119183225
    .
  2. ^
    S2CID 119256363
    .
  3. ^
    arXiv:2402.05345
    .
  4. ^ "2MASS J04151954-0935066 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-11-24.
  5. ^
    doi:10.1093/mnras/stv586
  6. ^
    S2CID 9273465
    .
  7. S2CID 16344176
    .
  8. ^ "The 100 nearest star systems". Research Consortium On Nearby Stars. Georgia State University. January 1, 2012. Retrieved 2012-06-11.

Further reading

  • Dupuy, Trent J.; Liu, Michael C. (2012). "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition". The Astrophysical Journal Supplement Series. 201 (2): 19.
    S2CID 119256363
    .

External links
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