A MeerKAT survey of nearby nova-like cataclysmic variables

D. M. Hewitt*, M. L. Pretorius, P. A. Woudt, E. Tremou, J. C.A. Miller-Jones, C. Knigge, N. Castro Segura, D. R.A. Williams, R. P. Fender, R. Armstrong, P. Groot, I. Heywood, A. Horesh, A. J. Van Der Horst, E. Koerding, V. A. McBride, K. P. Mooley, A. Rowlinson, B. Stappers, R. A.M.J. Wijers

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

13 Scopus citations

Abstract

We present the results of MeerKAT radio observations of 11 nearby nova-like cataclysmic variables (CVs). We have detected radio emission from IM Eri, RW Sex, V3885 Sgr, and V603 Aql. While RW Sex, V3885 Sgr, and V603 Aql had been previously detected, this is the first reported radio detection of IM Eri. Our observations have doubled the sample of non-magnetic CVs with sensitive radio data. We observe that at our radio detection limits, a specific optical luminosity ≳2.2× 1018 erg s-1 Hz-1 (corresponding to MV ≲ 6.0) is required to produce a radio detection. We also observe that the X-ray and radio luminosities of our detected nova-like CVs are on an extension of the LXλ LR∼ 0.7 power law originally proposed for non-pulsating neutron star low-mass X-ray binaries. We find no other correlations between the radio emission and emission in other wavebands or any other system parameters for the existing sample of radio-detected non-magnetic CVs. We measure in-band (0.9-1.7 GHz) radio spectral indices that are consistent with reports from earlier work. Finally, we constructed broad spectral energy distributions for our sample from published multiwavelength data, and use them to place constraints on the mass transfer rates of these systems.

Original languageAmerican English
Pages (from-to)2542-2557
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume496
Issue number3
DOIs
StatePublished - 17 Jun 2020

Bibliographical note

Publisher Copyright:
© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.

Keywords

  • X-rays: binaries
  • accretion, accretion discs
  • novae, cataclysmic variables
  • radio continuum: stars
  • stars: jets
  • white dwarfs

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