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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 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.

X-rays: binaries, accretion, accretion discs, novae, cataclysmic variables, radio continuum: stars, stars: jets, white dwarfs
1365-2966
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.
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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., 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 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.

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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: Funding Information: DMH acknowledges financial support from the National Research Foundation (NRF) and the South African Astronomical Observatory (SAAO). PAW kindly acknowledges financial support from the University of Cape Town and the NRF. MLP acknowledges financial support from the NRF and the Newton Fund. JCAM-J is the recipient of an Australian Research Council Future Fellowship (FT140101082), funded by the Australian government. This work was supported by the Oxford Centre for Astrophysical Surveys, which is funded through generous support from the Hintze Family Charitable Foundation. Funding Information: This work has used data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https:// www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. Funding Information: The authors thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported by NSF grant AST-1515927. Development of ASAS-SN has been supported by NSF grant AST-0908816, the Center for Cosmology and AstroParticle Physics at the Ohio State University, the Mt. Cuba Astronomical Foundation, and by George Skestos. Funding Information: This publication has used data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by NASA and the National Science Foundation. Funding Information: This publication has used data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by NASA. Funding Information: Some of the data used were obtained from the Mikulski Archive for Space Telescopes. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. 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

Identifiers

Local EPrints ID: 442111
URI: http://eprints.soton.ac.uk/id/eprint/442111
ISSN: 1365-2966
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: 16 Mar 2024 08:26

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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: N. Castro Segura
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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