Duffy, C;
Wu, Kinwah;
Ramsay, G;
Wood, Matt A;
Mason, Paul A;
Hakala, Pasi;
Steeghs, D;
(2024)
Characterizing high and low accretion states in VY Scl CVs using ZTF and TESS data.
Monthly Notices of the Royal Astronomical Society
, 535
(4)
pp. 3035-3049.
10.1093/mnras/stae2554.
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Abstract
VY Scl binaries are a sub-class of cataclysmic variable (CV) which show extended low states, but do not show outbursts which are seen in other classes of CV. To better determine how often these systems spend in low states and to resolve the state transitions we have analysed Zwicky Transient Facility (ZTF) data on eight systems and Transiting Exoplanet Survey Satellite (TESS) data on six systems. Half of the sample spent most of the time in a high state; three show a broad range and one spends roughly half the time transitioning between high and low states. Using the ZTF data, we explore the colour variation as a function of brightness. In KR Aur, we identify a series of repeating outburst events whose brightness appears to increase over time. Using TESS data, we searched for periods other than the orbital. In LN UMa, we find evidence for a peak whose period varies between 3 and 6 d. We outline the current models which aim to explain the observed properties of VY Scl systems which includes disc irradiation and a white dwarf having a significant magnetic field.
| Type: | Article |
|---|---|
| Title: | Characterizing high and low accretion states in VY Scl CVs using ZTF and TESS data |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stae2554 |
| Publisher version: | https://doi.org/10.1093/mnras/stae2554 |
| Language: | English |
| Additional information: | © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | accretion, accretion discs – binaries: general – stars: magnetic field – novae, cataclysmic variables – stars: variables: general. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10219074 |
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