Comparative analysis of two formation scenarios of bursty radio emission from ultracool dwarfs

A. A. Kuznetsov, J. G. Doyle, S. Yu, G. Hallinan, A. Antonova, A. Golden

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Recently, a number of ultracool dwarfs have been found to produce periodic radio bursts with high brightness temperature and polarization degree; the emission properties are similar to the auroral radio emissions of the magnetized planets of the solar system. We simulate the dynamic spectra of radio emission from ultracool dwarfs. The emission is assumed to be generated due to the electron-cyclotron maser instability. We consider two source models: the emission caused by interaction with a satellite and the emission from a narrow sector of active longitudes; the stellar magnetic field is modeled by a tilted dipole. We have found that for the dwarf TVLM 513-46546, the model of the satellite-induced emission is inconsistent with observations. On the other hand, the model of emission from an active sector is able to reproduce qualitatively the main features of the radio light curves of this dwarf; the magnetic dipole seems to be highly tilted (by about 60°) with respect to the rotation axis.

Original languageEnglish (US)
Article number99
JournalAstrophysical Journal
Volume746
Issue number1
DOIs
StatePublished - Feb 10 2012

Fingerprint

radio emission
radio
sectors
stellar magnetic fields
radio bursts
brightness temperature
masers
magnetic dipoles
solar system
light curve
cyclotrons
analysis
planets
dipoles
planet
polarization
magnetic field
electron
electrons
interactions

Keywords

  • brown dwarfs
  • planetstar interactions
  • radio continuum: stars
  • stars: low-mass
  • stars: magnetic field

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Kuznetsov, A. A., Doyle, J. G., Yu, S., Hallinan, G., Antonova, A., & Golden, A. (2012). Comparative analysis of two formation scenarios of bursty radio emission from ultracool dwarfs. Astrophysical Journal, 746(1), [99]. https://doi.org/10.1088/0004-637X/746/1/99

Comparative analysis of two formation scenarios of bursty radio emission from ultracool dwarfs. / Kuznetsov, A. A.; Doyle, J. G.; Yu, S.; Hallinan, G.; Antonova, A.; Golden, A.

In: Astrophysical Journal, Vol. 746, No. 1, 99, 10.02.2012.

Research output: Contribution to journalArticle

Kuznetsov, A. A. ; Doyle, J. G. ; Yu, S. ; Hallinan, G. ; Antonova, A. ; Golden, A. / Comparative analysis of two formation scenarios of bursty radio emission from ultracool dwarfs. In: Astrophysical Journal. 2012 ; Vol. 746, No. 1.
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