Return of the King: time-series photometry of FO Aquarii’s initial recovery from its unprecedented 2016 low state

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dc.contributor.author Littlefield, Colin
dc.contributor.author Garnavich, Peter M.
dc.contributor.author Kennedy, Mark R.
dc.contributor.author Aadland, E.
dc.contributor.author Terndrup, D. M.
dc.contributor.author Calhoun, G. V.
dc.contributor.author Callanan, Paul J.
dc.contributor.author Abe, L.
dc.contributor.author Bendjoya, P.
dc.contributor.author Rivet, J. P.
dc.contributor.author Vernet, D.
dc.contributor.author Devogéle, M.
dc.contributor.author Shappee, B.
dc.contributor.author Holoien, T.
dc.contributor.author Heras, T. A.
dc.contributor.author Bonnardeau, M.
dc.contributor.author Cook, M.
dc.contributor.author Coulter, D.
dc.contributor.author Debackére, A.
dc.contributor.author Dvorak, S.
dc.contributor.author Foster, J. R.
dc.contributor.author Goff, W.
dc.contributor.author Hambsch, F. J.
dc.contributor.author Harris, B.
dc.contributor.author Myers, G.
dc.contributor.author Nelson, P.
dc.contributor.author Popov, V.
dc.contributor.author Solomon, R.
dc.contributor.author Stein, W. L.
dc.contributor.author Stone, G.
dc.contributor.author Vietje, B.
dc.date.accessioned 2017-01-19T15:03:05Z
dc.date.available 2017-01-19T15:03:05Z
dc.date.issued 2016-12-09
dc.identifier.citation Colin, L. et al (2016) 'Return of the King: Time-series Photometry of FO Aquarii’s Initial Recovery from its Unprecedented 2016 Low State', The Astrophysical Journal, 833(1), pp. 93. doi:10.3847/1538-4357/833/1/93 en
dc.identifier.volume 833 en
dc.identifier.startpage 93-1 en
dc.identifier.endpage 93-7 en
dc.identifier.issn 0004-637X
dc.identifier.uri http://hdl.handle.net/10468/3482
dc.identifier.doi 10.3847/1538-4357/833/1/93
dc.description.abstract In 2016 May, the intermediate polar FO Aqr was detected in a low state for the first time in its observational history. We report time-resolved photometry of the system during its initial recovery from this faint state. Our data, which includes high-speed photometry with cadences of just 2 s, show the existence of very strong periodicities at 22.5 and 11.26 minutes, equivalent to the spin–orbit beat frequency and twice its value, respectively. A pulse at the spin frequency is also present but at a much lower amplitude than is normally observed in the bright state. By comparing our power spectra with theoretical models, we infer that a substantial amount of accretion was stream-fed during our observations, in contrast to the disk-fed accretion that dominates the bright state. In addition, we find that FO Aqr's rate of recovery has been unusually slow in comparison to rates of recovery seen in other magnetic cataclysmic variables, with an e-folding time of 115 ± 7 days. The recovery also shows irregular variations in the median brightness of as much as 0.2 mag over a 10-day span. Finally, we show that the arrival times of the spin pulses are dependent upon the system's overall brightness. en
dc.description.sponsorship National Science Foundation (under award AST-1411685 to the Ohio State University; NSF grant AST-0908816 and CCAPP at the Ohio State University, AST-1515927 ); NASA (through Hubble Fellowship grant HF-51348.001 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555.); University College Cork (Strategic Research Fund); en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Astronomical Society; IOP Publishing en
dc.rights © 2016. The American Astronomical Society. All rights reserved. en
dc.subject Accretion en
dc.subject Accretion disks en
dc.subject Binaries: eclipsing en
dc.subject Novae cataclysmic variables en
dc.subject Stars: individual (FO Aqr) en
dc.subject Stars: magnetic field en
dc.subject White dwarfs en
dc.title Return of the King: time-series photometry of FO Aquarii’s initial recovery from its unprecedented 2016 low state 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 National Aeronautics and Space Administration en
dc.contributor.funder University College Cork en
dc.contributor.funder The Naughton Foundation, Ireland en
dc.contributor.funder Center for Cosmology and AstroParticle Physics (CCAPP), United States en
dc.contributor.funder Mt. Cuba Astronomical Foundation, United States en
dc.contributor.funder Robert Martin Ayers Sciences Fund, United States en
dc.contributor.funder George Skestos en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Astrophysical Journal en
dc.internal.copyrightchecked !!CORA!! en
dc.internal.IRISemailaddress markkennedy@umail.ucc.ie en


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