Curtin University Homepage
  • Library
  • FAQ
    • Log in

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    154 MHz Detection of Faint, Polarized Flares from UV Ceti

    Access Status
    Fulltext not available
    Authors
    Lynch, C.
    Lenc, E.
    Kaplan, D.
    Murphy, T.
    Anderson, Gemma
    Date
    2017
    Collection
    • Curtin Research Publications
    Type
    Journal Article
    Metadata
    Show full item record
    Abstract

    We have detected four flares from UV Ceti at 154 MHz using the Murchison Widefield Array. The flares have flux densities between 10 and 65 mJy-a factor of 100 fainter than most flares in the literature at these frequencies-and are only detected in polarization. The circular polarized fractions are limited to >27% at 3s confidence and two of the flares exhibit polarity reversal. We suggest that these flares occur periodically on a timescale consistent with the rotational period of UV Ceti During the brightest observed flare, we also detect significant linear polarization with a polarization fraction >18%. Averaging the data in 6 minute, 10 MHz frequency bins we find that the flux density of these flares does not vary over the 30 MHz bandwidth of the Murchison Widefield Array; however, we cannot rule out finer time-frequency structure. Using the measured flux densities for the flares, we estimate brightness temperatures between (1013-1014) K, indicative of a coherent emission mechanism. The brightness temperature and polarization characteristics point to the electron cyclotron maser mechanism. We also calculate the flare rates given our four observed flares and compare them to flare rates for the set of M dwarf stars with known 100-200 MHz flares. Our measurement is the first for flares with intensities <100 mJy at 100-200 MHz. © 2017. The American Astronomical Society. All rights reserved.

    Citation
    Lynch, C. and Lenc, E. and Kaplan, D. and Murphy, T. and Anderson, G. 2017. 154 MHz Detection of Faint, Polarized Flares from UV Ceti. The Astrophysical Journal Letters. 836: L30.
    Source Title
    The Astrophysical Journal Letters
    URI
    http://hdl.handle.net/20.500.11937/52115
    DOI
    10.3847/2041-8213/aa5ffd
    Department
    Curtin Institute of Radio Astronomy (Physics)

    Related items

    Showing items related by title, author, creator and subject.

    • Extreme jet ejections from the black hole X-ray binary V404 Cygni
      Tetarenko, A.; Sivakoff, G.; Miller-Jones, James; Rosolowsky, E.; Petitpas, G.; Gurwell, M.; Wouterloot, J.; Fender, R.; Heinz, S.; Maitra, D.; Markoff, S.; Migliari, S.; Rupen, M.; Rushton, A.; Russell, D.; Russell, T.; Sarazin, C. (2017)
      We present simultaneous radio through sub-mm observations of the black hole X-ray binary (BHXB) V404 Cygni during the most active phase of its June 2015 outburst. Our 4 h long set of overlapping observations with the Very ...
    • On the nature of late X-ray flares in Swift gamma-ray bursts
      Curran, Peter; Starling, R.; O’Brien, P.; Godet, O.; van der Horst, A.; Wijers, R. (2008)
      Context. Previously detected in only a few gamma-ray bursts (GRBs), X-ray flares are now observed in ~50% of Swift GRBs, thoughtheir origins remain unclear. Most flares are seen early on in the afterglow decay, while some ...
    • Opacity effects and shock-in-jet modelling of low-level activity in Cygnus X-3
      Miller-Jones, James; Rupen, M.; Turler, M.; Lindfors, E.; Blundell, K.; Pooley, G. (2009)
      We present simultaneous dual-frequency radio observations of Cygnus X-3 during a phase of low-level activity. We constrain the minimum variability time-scale to be 20min at 43GHz and 30min at 15GHz, implying source sizes ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorsTitlesSubjectsDocument TypesThis CollectionIssue DateAuthorsTitlesSubjectsDocument Types

    My Account

    Log in

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Connect with Curtin

    • 
    • 
    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Send FeedbackContact Us
    DSpace software copyright © 2002-2015  DuraSpace