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Subject Item
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dbr:2MASS_J11263991−5003550
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2MASS J11263991−5003550 2MASS J11263991−5003550 2MASS J11263991-5003550
rdfs:comment
2MASS J11263991-5003550 ist ein 27 Lichtjahre von der Erde entfernter Brauner Zwerg im Sternbild Zentaur. Er wurde 2007 von Simon Folkes et al. entdeckt. Er gehört der Spektralklasse L9 an. Seine Position verschiebt sich aufgrund seiner Eigenbewegung jährlich um 1,64 Bogensekunden. 2MASS J11263991−5003550 (2MASS J1126−5003) é uma anã marrom a cerca de 53 anos-luz de distância da Terra. A anã marrom é notável por uma cor azul incomum no infravermelho próximo. Esta anã marrom não mostra características subanãs e a cor azul não pode ser explicada por um binário não resolvido. Em vez disso, a cor azul é explicada por nuvens irregulares. O modelo de nuvem irregular permite nuvens espessas e uma cobertura de nuvens de 50% para explicar os espectros de 2MASS J1126−5003. Existem outras anãs L azuis, mas são bastante raras. 2MASS J11263991−5003550 (2MASS J1126−5003) is a brown dwarf about 53 light-years distant from earth. The brown dwarf is notable for an unusual blue near-infrared color. 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. The patchy cloud model allows thick clouds and a cloud coverage of 50% to explain the spectra of 2MASS J1126−5003. Other blue L-dwarfs exist, but are quite rare.
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2MASS J11263991−5003550
dcterms:subject
dbc:L-type_stars dbc:Centaurus_(constellation) dbc:2MASS_objects dbc:Brown_dwarfs
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L4.5
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0.3273
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61.6319
dbp:propMoDec
450.986
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-1589.17
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dbr:Brown_dwarf
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dbo:abstract
2MASS J11263991-5003550 ist ein 27 Lichtjahre von der Erde entfernter Brauner Zwerg im Sternbild Zentaur. Er wurde 2007 von Simon Folkes et al. entdeckt. Er gehört der Spektralklasse L9 an. Seine Position verschiebt sich aufgrund seiner Eigenbewegung jährlich um 1,64 Bogensekunden. 2MASS J11263991−5003550 (2MASS J1126−5003) é uma anã marrom a cerca de 53 anos-luz de distância da Terra. A anã marrom é notável por uma cor azul incomum no infravermelho próximo. Esta anã marrom não mostra características subanãs e a cor azul não pode ser explicada por um binário não resolvido. Em vez disso, a cor azul é explicada por nuvens irregulares. O modelo de nuvem irregular permite nuvens espessas e uma cobertura de nuvens de 50% para explicar os espectros de 2MASS J1126−5003. Existem outras anãs L azuis, mas são bastante raras. 2MASS J11263991−5003550 (2MASS J1126−5003) is a brown dwarf about 53 light-years distant from earth. The brown dwarf is notable for an unusual blue near-infrared color. 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. The patchy cloud model allows thick clouds and a cloud coverage of 50% to explain the spectra of 2MASS J1126−5003. Other blue L-dwarfs exist, but are quite rare. 2MASS J1126−5003 has a deep water (H2O) absorption feature in its spectra, which is comparable with late L-dwarfs and early 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. 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. Previously one suggested scenario were thinner clouds. This brown dwarf shows variations in the J-band and at mid-infrared wavelengths with a period of 3.2 ± 0.3 hours. This is a clear indication of patchy clouds.
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