2MASS J11263991−5003550

Source: Wikipedia, the free encyclopedia.
2MASS J11263991−5003550
Observation data
J2000.0
Constellation Centaurus
Right ascension 11h 26m 39.80353s[1]
Declination −50° 03′ 54.8495″[1]
Characteristics
Evolutionary stage brown dwarf
Spectral type L4.5[2]
Variable type Rotational[3]
Distance
52.9 ± 0.3 ly
(16.23 ± 0.09 pc)
Details
Rotational velocity (v sin i)
22.8+1.6
−2.4[4] km/s
DENIS J112639.9-500355, WISEA J112638.07-500350.1, Gaia
 DR2 5372923621096443008
Database references
SIMBADdata

2MASS J11263991−5003550 (2MASS J1126−5003) is a

near-infrared color.[6][2] This brown dwarf does not show subdwarf features and the blue color cannot be explained by an unresolved binary. Instead the blue color is explained by patchy clouds.[2][7][3] The patchy cloud model allows thick clouds and a cloud coverage of 50% to explain the spectra of 2MASS J1126−5003.[7] Other blue L-dwarfs exist, but are quite rare.[8]

2MASS J1126−5003 has a deep

T-dwarfs. It also shows weak carbon monoxide (CO) features. It lacks any methane (CH4) feature and is therefore not a T-dwarf. Based on near-infrared spectra this brown dwarf was therefore classified as an L9 spectral type brown dwarf. The optical spectrum is on the other hand more similar to a mid-type L-dwarf. Here a spectral type of L4.5 fits the optical spectrum. This optical spectral type is a more reliable estimate as the near-infrared spectrum does not fit spectra from other L-dwarfs.[2]

Lower metallicity and higher surface gravity might play a role in the formation of the weather on 2MASS J1126−5003. Lower metallicity reduces the available metal species to form cloud condensates. The higher surface gravity might cause an increased sedimentation of cloud condensates, resulting in thinner clouds. Other factors, like rotation, vertical upwelling and magnetic fields might play a role as well.[2]

Previously one suggested scenario were thinner clouds. This brown dwarf shows variations in the J-band[3] and at mid-infrared wavelengths with a period of 3.2 ± 0.3 hours.[5] This is a clear indication of patchy clouds.

References

  1. ^
    S2CID 49211658
    .
  2. ^
    S2CID 6111840
    .
  3. ^
    S2CID 118357522
    .
  4. ^
    ISSN 0004-637X
    .
  5. ^
    ISSN 0004-637X
    .
  6. ^
    ISSN 0035-8711
    .
  7. ^
    S2CID 56286093
    .
  8. ISSN 0067-0049
    .


Stub icon

This brown dwarf-related article is a stub. You can help Wikipedia by expanding it.

Retrieved from "https://en.wikipedia.org/w/index.php?title=2MASS_J11263991−5003550&oldid=1181834614"