Duffy, C;
Ramsay, G;
Wu, Kinwah;
Mason, Paul A;
Hakala, P;
Steeghs, D;
Wood, MA;
(2022)
Short-duration accretion states of Polars as seen in TESS and ZTF data.
Monthly Notices of the Royal Astronomical Society
, 516
(3)
pp. 3144-3158.
10.1093/mnras/stac2482.
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Abstract
Polars are highly magnetic cataclysmic variables which have been long observed to have both high and low brightness states. The duration of these states has been previously seen to vary from a number of days up to years. Despite this, these states and their physical origin have not been explained in a consistent manner. We present observations of the shortest duration states of a number of Polars observed by ZTF and TESS. This has allowed us to determine that short-duration states are a relatively common feature across the population of Polars. Furthermore, we have been able to generalize the model of star-spot migration to explain both short-lived high and low states in Polars by incorporating the interaction between the magnetic field of the white dwarf and that of the star spots.
| Type: | Article |
|---|---|
| Title: | Short-duration accretion states of Polars as seen in TESS and ZTF data |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stac2482 |
| Publisher version: | https://doi.org/10.1093/mnras/stac2482 |
| Language: | English |
| Additional information: | This work was funded by UKRI grant (ST/T505936/1). For the purpose of open access, the authors have applied a creative commons attribution (CC BY) licence to any author accepted manuscript version arising. C. Duffy acknowledges STFC for the receipt of a postgraduate studentship. Armagh Observatory & Planetarium is core funded by the Northern Ireland Executive through the Department for Communities. P. Mason is funded by Picture Rocks Observatory. |
| Keywords: | accretion, accretion discs, binaries: close, stars: magnetic fields, novae, cataclysmic variables, starspots |
| UCL classification: | 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 UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10155987 |
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