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A MeerKAT survey of nearby novalike cataclysmic variables

A MeerKAT survey of nearby novalike cataclysmic variables
A MeerKAT survey of nearby novalike cataclysmic variables
We present the results of MeerKAT radio observations of eleven nearby novalike cataclysmic variables. 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 $\gtrsim 2.2\times 10^{18}$ erg/s/Hz (corresponding to $M_V \lesssim 6.0$) is required to produce a radio detection. We also observe that the X-ray and radio luminosities of our detected novalikes are on an extension of the $L_{X} \propto L_{R}^{\sim 0.7}$ 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 multi-wavelength data, and use them to place constraints on the mass transfer rates of these systems.
astro-ph.HE, astro-ph.SR
0035-8711
2542–2557
Hewitt, D. M.
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Pretorius, M. L.
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Woudt, P. A.
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Tremou, E.
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Miller-Jones, J. C. A.
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Knigge, C.
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Segura, N. Castro
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Williams, D. R. A.
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Fender, R. P.
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Armstrong, R.
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Groot, P.
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Heywood, I.
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Horesh, A.
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Horst, A. J. van der
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Koerding, E.
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McBride, V. A.
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Mooley, K. P.
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Rowlinson, A.
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Stappers, B.
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Wijers, R. A. M. J.
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Hewitt, D. M.
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Pretorius, M. L.
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Woudt, P. A.
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Tremou, E.
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Miller-Jones, J. C. A.
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Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Segura, N. Castro
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Williams, D. R. A.
c9ded967-198f-4c26-96b1-8c03d7d26445
Fender, R. P.
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Armstrong, R.
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Groot, P.
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Heywood, I.
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Horesh, A.
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Horst, A. J. van der
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Koerding, E.
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McBride, V. A.
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Mooley, K. P.
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Rowlinson, A.
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Stappers, B.
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Wijers, R. A. M. J.
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Hewitt, D. M., Pretorius, M. L., Woudt, P. A., Tremou, E., Miller-Jones, J. C. A., Knigge, C., Segura, N. Castro, Williams, D. R. A., Fender, R. P., Armstrong, R., Groot, P., Heywood, I., Horesh, A., Horst, A. J. van der, Koerding, E., McBride, V. A., Mooley, K. P., Rowlinson, A., Stappers, B. and Wijers, R. A. M. J. (2020) A MeerKAT survey of nearby novalike cataclysmic variables. Monthly Notices of the Royal Astronomical Society, 496 (3), 2542–2557. (doi:10.1093/mnras/staa1747).

Record type: Article

Abstract

We present the results of MeerKAT radio observations of eleven nearby novalike cataclysmic variables. 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 $\gtrsim 2.2\times 10^{18}$ erg/s/Hz (corresponding to $M_V \lesssim 6.0$) is required to produce a radio detection. We also observe that the X-ray and radio luminosities of our detected novalikes are on an extension of the $L_{X} \propto L_{R}^{\sim 0.7}$ 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 multi-wavelength data, and use them to place constraints on the mass transfer rates of these systems.

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2006.07918v1 - Accepted Manuscript
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Accepted/In Press date: 10 June 2020
Published date: 22 June 2020
Additional Information: 16 pages, 9 figures, accepted to MNRAS
Keywords: astro-ph.HE, astro-ph.SR

Identifiers

Local EPrints ID: 442111
URI: http://eprints.soton.ac.uk/id/eprint/442111
ISSN: 0035-8711
PURE UUID: f61639f4-60cd-4ea6-b4a2-f906bdf5ca32
ORCID for D. R. A. Williams: ORCID iD orcid.org/0000-0001-7361-0246

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Date deposited: 07 Jul 2020 16:49
Last modified: 09 Oct 2020 16:30

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Contributors

Author: D. M. Hewitt
Author: M. L. Pretorius
Author: P. A. Woudt
Author: E. Tremou
Author: J. C. A. Miller-Jones
Author: C. Knigge
Author: D. R. A. Williams ORCID iD
Author: R. P. Fender
Author: R. Armstrong
Author: P. Groot
Author: I. Heywood
Author: A. Horesh
Author: A. J. van der Horst
Author: E. Koerding
Author: V. A. McBride
Author: K. P. Mooley
Author: A. Rowlinson
Author: B. Stappers
Author: R. A. M. J. Wijers

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