Kepler K2 observations of the intermediate polar FO Aquarii

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dc.contributor.authorKennedy, Mark R.
dc.contributor.authorGarnavich, Peter M.
dc.contributor.authorBreedt, E.
dc.contributor.authorMarsh, T. R.
dc.contributor.authorGänsicke, B. T.
dc.contributor.authorSteeghs, D.
dc.contributor.authorSzkody, P.
dc.contributor.authorDai, Z.
dc.contributor.funderNational Science Foundationen
dc.contributor.funderUniversity College Corken
dc.contributor.funderScience and Technology Facilities Councilen
dc.contributor.funderEuropean Research Councilen
dc.contributor.funderSeventh Framework Programmeen
dc.contributor.funderEuropean Commissionen
dc.contributor.funderChinese Academy of Sciencesen
dc.date.accessioned2017-01-19T15:43:16Z
dc.date.available2017-01-19T15:43:16Z
dc.date.issued2016-04-20
dc.description.abstractWe 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.sponsorshipNational 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.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationKennedy, 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/stw834en
dc.identifier.doi10.1093/mnras/stw834
dc.identifier.endpage3628en
dc.identifier.issn0035-8711
dc.identifier.journaltitleMonthly Notices of the Royal Astronomical Societyen
dc.identifier.startpage3622en
dc.identifier.urihttps://hdl.handle.net/10468/3483
dc.identifier.volume459en
dc.language.isoenen
dc.publisherOxford University Pressen
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP2::ERC/320964/EU/White Dwarfs as Tracers of Stellar, Binary and Planetary Evolution/WDTRACERen
dc.rightsThis 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.subjectAccretionen
dc.subjectAccretion discsen
dc.subjectMagnetic fields – eclipsesen
dc.subjectNovae Cataclysmic variablesen
dc.subjectWhite dwarfsen
dc.titleKepler K2 observations of the intermediate polar FO Aquariien
dc.typeArticle (peer-reviewed)en
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