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    Novalike cataclysmic variables are significant radio emitters

    231979_231979.pdf (1.052Mb)
    Access Status
    Open access
    Authors
    Coppejans, D.
    Körding, E.
    Miller-Jones, James
    Rupen, M.
    Knigge, C.
    Sivakoff, G.
    Groot, P.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Coppejans, D. and Körding, E. and Miller-Jones, J. and Rupen, M. and Knigge, C. and Sivakoff, G. and Groot, P. 2015. Novalike cataclysmic variables are significant radio emitters. Monthly Notices of the Royal Astronomical Society. 451 (4): pp. 3801-3813.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stv1225
    ISSN
    0035-8711
    School
    Department of Physics and Astronomy
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140101082
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/43391
    Collection
    • Curtin Research Publications
    Abstract

    Radio emission from non-magnetic cataclysmic variables (CVs, accreting white dwarfs) could allow detailed studies of outflows and possibly accretion flows in these nearby, numerous and non-relativistic compact accretors. Up to now, however, very few CVs have been detected in the radio. We have conducted a Very Large Array pilot survey of four close and optically bright novalike CVs at 6 GHz, detecting three, and thereby doubling the number of radio detections of these systems. TT Ari, RW Sex and the old nova V603 Aql were detected in both of the epochs, while V1084 Her was not detected (to a 3σ upper limit of 7.8 μJybeam−1). These observations clearly show that the sensitivity of previous surveys was typically too low to detect these objects and that non-magnetic CVs can indeed be significant radio emitters. The three detected sources show a range of properties, including flaring and variability on both short (~200 s) and longer term (days) time-scales, as well as circular polarization levels of up to 100 per cent. The spectral indices range from steep to inverted; TT Ari shows a spectral turnover at ~6.5 GHz, while the spectral index of V603 Aql flattened from α = 0.54 ± 0.05 to 0.16 ± 0.08 (Fν ∝ να) in the week between observations. This range of properties suggests that more than one emission process can be responsible for the radio emission in non-magnetic CVs. In this sample we find that individual systems are consistent with optically thick synchrotron emission, gyrosynchrotron emission or cyclotron maser emission.

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