2009
DOI: 10.1051/0004-6361/200810216
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Short-term spectroscopic monitoring of two cool dwarfs with strong magnetic fields

Abstract: Context. There is now growing evidence that some brown dwarfs (BDs) have very strong magnetic fields, and yet their surface temperatures are so low that the coupling is expected to be small between the matter and the magnetic field in the atmosphere. In the deeper layers, however, the coupling is expected to be much stronger. Aims. This raises the question of whether the magnetic field still leads to the formation of structures in the photosphere and of a solar-like chromosphere and corona. Methods. We carried… Show more

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Cited by 3 publications
(2 citation statements)
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“…Several hours of spectroscopic monitoring by Guenther et al (2009) in the infrared did not reveal any variability. Gelino et al (2002) found 0036+1821 non-variable in the I band.…”
Section: +1821mentioning
confidence: 83%
“…Several hours of spectroscopic monitoring by Guenther et al (2009) in the infrared did not reveal any variability. Gelino et al (2002) found 0036+1821 non-variable in the I band.…”
Section: +1821mentioning
confidence: 83%
“…Such a model requires knowledge of the magnetic geometry for the ultracool dwarf, specifically the angle of inclination between the line of sight and the magnetic axis, B An estimate of this inclination can be obtained from observed variability in optical emission. However, 2MASS J1048-3956, 2MASS J0339-3526, and 2MASS J0004-4044 are observed to have little variability at these wavelengths (Guenther et al 2009;Schmidt et al 2007;Stelzer et al 2012;2014). Thus to characterize the plasma conditions responsible for this emission, we construct a simple coronal model consisting of a homogenous population of mildly-relativistic power-law electrons spiralling in a uniform magnetic field.…”
Section: Origins For the Emissionmentioning
confidence: 99%