Periodic bursts of coherent radio emission from an ultracool dwarf

G. Hallinan, S. Bourke, C. Lane, A. Antonova, R. T. Zavala, W. F. Brisken, R. P. Boyle, F. J. Vrba, J. G. Doyle, A. Golden

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

We report the detection of periodic (p = 1.96 hr) bursts of extremely bright, 100% circularly polarized, coherent radio emission from the M9 dwarf TVLM 513-46546. Simultaneous photometric monitoring observations have established this periodicity to be the rotation period of the dwarf. These bursts, which were not present in previous observations of this target, confirm that ultracool dwarfs can generate persistent levels of broadband, coherent radio emission, associated with the presence of kG magnetic fields in a large-scale, stable configuration. Compact sources located at the magnetic polar regions produce highly beamed emission generated by the electron cyclotron maser instability, the same mechanism known to generate planetary coherent radio emission in our solar system. The narrow beams of radiation pass our line of sight as the dwarf rotates, producing the associated periodic bursts. The resulting radio light curves are analogous to the periodic light curves associated with pulsar radio emission highlighting TVLM 513-46546 as the prototype of a new class of transient radio source.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume663
Issue number1 II
DOIs
StatePublished - Jul 1 2007
Externally publishedYes

Fingerprint

radio emission
bursts
radio
light curve
masers
solar system
pulsars
polar regions
line of sight
cyclotrons
periodic variations
prototypes
polar region
broadband
periodicity
radiation
configurations
magnetic fields
magnetic field
electron

Keywords

  • Pulsars: general
  • Radiation mechanisms: nonthermal
  • Radio continuum: stars
  • Stars: activity
  • Stars: low-mass, brown dwarfs
  • Stars: magnetic fields

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Hallinan, G., Bourke, S., Lane, C., Antonova, A., Zavala, R. T., Brisken, W. F., ... Golden, A. (2007). Periodic bursts of coherent radio emission from an ultracool dwarf. Astrophysical Journal, 663(1 II). https://doi.org/10.1086/519790

Periodic bursts of coherent radio emission from an ultracool dwarf. / Hallinan, G.; Bourke, S.; Lane, C.; Antonova, A.; Zavala, R. T.; Brisken, W. F.; Boyle, R. P.; Vrba, F. J.; Doyle, J. G.; Golden, A.

In: Astrophysical Journal, Vol. 663, No. 1 II, 01.07.2007.

Research output: Contribution to journalArticle

Hallinan, G, Bourke, S, Lane, C, Antonova, A, Zavala, RT, Brisken, WF, Boyle, RP, Vrba, FJ, Doyle, JG & Golden, A 2007, 'Periodic bursts of coherent radio emission from an ultracool dwarf', Astrophysical Journal, vol. 663, no. 1 II. https://doi.org/10.1086/519790
Hallinan G, Bourke S, Lane C, Antonova A, Zavala RT, Brisken WF et al. Periodic bursts of coherent radio emission from an ultracool dwarf. Astrophysical Journal. 2007 Jul 1;663(1 II). https://doi.org/10.1086/519790
Hallinan, G. ; Bourke, S. ; Lane, C. ; Antonova, A. ; Zavala, R. T. ; Brisken, W. F. ; Boyle, R. P. ; Vrba, F. J. ; Doyle, J. G. ; Golden, A. / Periodic bursts of coherent radio emission from an ultracool dwarf. In: Astrophysical Journal. 2007 ; Vol. 663, No. 1 II.
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AU - Brisken, W. F.

AU - Boyle, R. P.

AU - Vrba, F. J.

AU - Doyle, J. G.

AU - Golden, A.

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N2 - We report the detection of periodic (p = 1.96 hr) bursts of extremely bright, 100% circularly polarized, coherent radio emission from the M9 dwarf TVLM 513-46546. Simultaneous photometric monitoring observations have established this periodicity to be the rotation period of the dwarf. These bursts, which were not present in previous observations of this target, confirm that ultracool dwarfs can generate persistent levels of broadband, coherent radio emission, associated with the presence of kG magnetic fields in a large-scale, stable configuration. Compact sources located at the magnetic polar regions produce highly beamed emission generated by the electron cyclotron maser instability, the same mechanism known to generate planetary coherent radio emission in our solar system. The narrow beams of radiation pass our line of sight as the dwarf rotates, producing the associated periodic bursts. The resulting radio light curves are analogous to the periodic light curves associated with pulsar radio emission highlighting TVLM 513-46546 as the prototype of a new class of transient radio source.

AB - We report the detection of periodic (p = 1.96 hr) bursts of extremely bright, 100% circularly polarized, coherent radio emission from the M9 dwarf TVLM 513-46546. Simultaneous photometric monitoring observations have established this periodicity to be the rotation period of the dwarf. These bursts, which were not present in previous observations of this target, confirm that ultracool dwarfs can generate persistent levels of broadband, coherent radio emission, associated with the presence of kG magnetic fields in a large-scale, stable configuration. Compact sources located at the magnetic polar regions produce highly beamed emission generated by the electron cyclotron maser instability, the same mechanism known to generate planetary coherent radio emission in our solar system. The narrow beams of radiation pass our line of sight as the dwarf rotates, producing the associated periodic bursts. The resulting radio light curves are analogous to the periodic light curves associated with pulsar radio emission highlighting TVLM 513-46546 as the prototype of a new class of transient radio source.

KW - Pulsars: general

KW - Radiation mechanisms: nonthermal

KW - Radio continuum: stars

KW - Stars: activity

KW - Stars: low-mass, brown dwarfs

KW - Stars: magnetic fields

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