Kepler K2 observations of the intermediate polar FO Aquarii

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dc.contributor.author Kennedy, Mark R.
dc.contributor.author Garnavich, Peter M.
dc.contributor.author Breedt, E.
dc.contributor.author Marsh, T. R.
dc.contributor.author Gänsicke, B. T.
dc.contributor.author Steeghs, D.
dc.contributor.author Szkody, P.
dc.contributor.author Dai, Z.
dc.date.accessioned 2017-01-19T15:43:16Z
dc.date.available 2017-01-19T15:43:16Z
dc.date.issued 2016-04-20
dc.identifier.citation Kennedy, M. R., Garnavich, P., Breedt, E., Marsh, T. R., Gänsicke, B. T., Steeghs, D., Szkody, P. and Dai, Z. (2016) 'Kepler K2 observations of the intermediate polar FO Aquarii', Monthly Notices of the Royal Astronomical Society, 459(4), pp. 3622-3628. doi:10.1093/mnras/stw834 en
dc.identifier.volume 459 en
dc.identifier.startpage 3622 en
dc.identifier.endpage 3628 en
dc.identifier.issn 0035-8711
dc.identifier.uri http://hdl.handle.net/10468/3483
dc.identifier.doi 10.1093/mnras/stw834
dc.description.abstract We present photometry of the intermediate polar FO Aquarii (FO Aqr) obtained as part of the K2 mission using the Kepler space telescope. The amplitude spectrum of the data confirms the orbital period of 4.8508(4) h, and the shape of the light curve is consistent with the outer edge of the accretion disc being eclipsed when folded on this period. The average flux of FO Aqr changed during the observations, suggesting a change in the mass accretion rate. There is no evidence in the amplitude spectrum of a longer period that would suggest disc precession. The amplitude spectrum also shows the white dwarf spin period of 1254.3401(4) s, the beat period of 1351.329(2) s, and 31 other spin and orbital harmonics. The detected period is longer than the last reported period of 1254.284(16) s, suggesting that FO Aqr is now spinning down, and has a positive P. There is no detectable variation in the spin period over the course of the K2 observations, but the phase of the spin cycle is correlated with the system brightness. We also find that the amplitude of the beat signal is correlated with the system brightness. en
dc.description.sponsorship National Science Foundation (NSF grant AST-1514737); Naughton Foundation; University College Cork (UCC Strategic Research Fund); Science and Technology Facilities Council (STFC under grant ST/L000733); Chinese Academy of Sciences (CAS ‘Light of West China” Program’) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Oxford University Press en
dc.rights This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. en
dc.subject Accretion en
dc.subject Accretion discs en
dc.subject Magnetic fields – eclipses en
dc.subject Novae Cataclysmic variables en
dc.subject White dwarfs en
dc.title Kepler K2 observations of the intermediate polar FO Aquarii en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Mark R. Kennedy, Department of Physics, University College Cork, Cork, Ireland. T: +353 21 490 3000. E: markkennedy@umail.ucc.ie en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.contributor.funder National Science Foundation en
dc.contributor.funder University College Cork en
dc.contributor.funder Science and Technology Facilities Council en
dc.contributor.funder European Research Council en
dc.contributor.funder Seventh Framework Programme en
dc.contributor.funder European Commission en
dc.contributor.funder Chinese Academy of Sciences en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Monthly Notices of the Royal Astronomical Society en
dc.internal.IRISemailaddress markkennedy@umail.ucc.ie en
dc.relation.project info:eu-repo/grantAgreement/EC/FP7::SP2::ERC/320964/EU/White Dwarfs as Tracers of Stellar, Binary and Planetary Evolution/WDTRACER en


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