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The return of the spin period in DW Cnc and evidence of new high state outbursts

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Duffy, C., Ramsay, G., Steeghs, D., Kennedy, M. R., West, Richard G., Wheatley, P. J., Dhillon, V. S., Ackley, K., Dyer, M. J., Galloway, D. K., Gill, S., Acton, J. S., Burleigh, M. R., Casewell, S. L., Goad, M. R., Henderson, B. A., Tilbrook, R. H., Strøm, Paul A. and Anderson, David (2022) The return of the spin period in DW Cnc and evidence of new high state outbursts. Monthly Notices of the Royal Astronomical Society, 510 (1). pp. 1002-1009. doi:10.1093/mnras/stab3402 ISSN 1745-3933.

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Official URL: https://doi.org/10.1093/mnras/stab3402

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Abstract

DW Cnc is an intermediate polar which has previously been observed in both high and low states. Observations of the high state of DW Cnc have previously revealed a spin period at ∼38.6 min, however observations from the 2018/19 low state showed no evidence of the spin period. We present results from our analysis of 12 s cadence photometric data collected by NGTS of DW Cnc during the high state which began in 2019. Following the previously reported suppression of the spin period signal we identify the return of this signal during the high state, consistent with previous observations of it. We identify this as the restarting of accretion during the high state. We further identified three short outbursts lasting ∼1 d in DW Cnc with a mean recurrence time of ∼60 d and an amplitude of ∼1 mag. These are the first outbursts identified in DW Cnc since 2008. Due to the short nature of these events we identify them not as a result of accretion instabilities but instead either from instabilities originating from the interaction of the magnetorotational instability in the accretion disc and the magnetic field generated by the white dwarf or the result of magnetic gating.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Accretion (Astrophysics), Cataclysmic variable stars, Stars -- Rotation, Solar magnetic fields
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 1745-3933
Official Date: February 2022
Dates:
DateEvent
February 2022Published
26 November 2021Available
19 November 2021Accepted
Volume: 510
Number: 1
Page Range: pp. 1002-1009
DOI: 10.1093/mnras/stab3402
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2021 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 26 April 2022
Date of first compliant Open Access: 27 April 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
NGTS projectUniversity of Warwickhttp://dx.doi.org/10.13039/501100000741
NGTS projectUniversity of Leicesterhttp://dx.doi.org/10.13039/501100000738
NGTS projectQueen's University Belfasthttp://dx.doi.org/10.13039/501100000873
NGTS projectUniversité de Genèvehttp://dx.doi.org/10.13039/501100006389
Großinvestition GI-NGTSDeutsches Zentrum für Luft- und Raumfahrthttp://dx.doi.org/10.13039/501100002946
NGTS projectUniversity of CambridgeUNSPECIFIED
ST/M001962/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDMonash Universityhttp://dx.doi.org/10.13039/501100001779
UNSPECIFIEDUniversity of Warwickhttp://dx.doi.org/10.13039/501100000741
UNSPECIFIEDUniversity of Sheffieldhttp://dx.doi.org/10.13039/501100000858
UNSPECIFIEDUniversity of Leicesterhttp://dx.doi.org/10.13039/501100000738
UNSPECIFIEDArmagh Observatoryhttp://dx.doi.org/10.13039/501100000527
UNSPECIFIEDNational Astronomical Research Institute of Thailandhttps://www.narit.or.th/
UNSPECIFIEDInstituto de Astrofísica de Canariashttps://www.iac.es/
UNSPECIFIEDUniversity of Portsmouthhttp://dx.doi.org/10.13039/100009153
UNSPECIFIEDUniversity of Turkuhttps://www.utu.fi/
ST/T007184/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
ST/T003103/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
CE170100004[ARC] Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
UNSPECIFIEDDepartment for Communities, Northern Ireland ExecutiveUNSPECIFIED
Postgraduate Studentship[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
GOIPD/2021/670: Invisible MonstersIrish Research Councilhttp://dx.doi.org/10.13039/501100002081
AST-1440341[NSF] National Science Foundation (US)http://dx.doi.org/10.13039/100000001
UNSPECIFIEDCalifornia Institute of Technologyhttp://dx.doi.org/10.13039/100006961
UNSPECIFIEDWeizmann Institute of Sciencehttp://dx.doi.org/10.13039/501100001735
UNSPECIFIEDStockholms Universitethttp://dx.doi.org/10.13039/501100009244
UNSPECIFIEDUniversity of Marylandhttp://dx.doi.org/10.13039/100008510
UNSPECIFIEDUniversity of Washingtonhttp://dx.doi.org/10.13039/100007812
UNSPECIFIEDDeutsches Elektronen-Synchrotronhttp://dx.doi.org/10.13039/501100001647
UNSPECIFIEDHumboldt-Universität zu Berlinhttp://dx.doi.org/10.13039/501100006211
UNSPECIFIEDLos Alamos National Laboratoryhttp://dx.doi.org/10.13039/100008902
UNSPECIFIEDTANGO Consortium of TaiwanUNSPECIFIED
UNSPECIFIEDUniversity of Wisconsin-Milwaukeehttp://dx.doi.org/10.13039/100006817
UNSPECIFIEDLawrence Berkeley National Laboratoryhttp://dx.doi.org/10.13039/100006235

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