Article (Scientific journals)
Return of the King: Time-Series Photometry of FO Aquarii's Initial Recovery from its Unprecedented 2016 Low State
Littlefield, Colin; Garnavich, Peter; Kennedy, Mark et al.
2016In Astrophysical Journal, 883 (93), p. 7
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Keywords :
Accretion disk; Eclipsing; cataclysmic variables
Abstract :
[en] 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 sec, shows the existence of very strong periodicities at 22.5 min and 11.26 min, 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Littlefield, Colin
Garnavich, Peter
Kennedy, Mark
Aadland, Erin
Terndrup, Donald
Calhoun, Grace
Callanan, Paul
Abe, Lyu
Bendjoya, Philippe
Rivet, Jean-Pierre
Devogele, Maxime ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Shappee, Benjamin
Holoien, Thomas
Arranz, Teofilo
Bonnardeau, Michel
Cook, Michael
Coulter, Daniel
Debackere, Andre
Dvorak, Shawn
Foster, James
Goff, William
Hambsch, Franz-Josef
Harris, Barbara
Myers, Gordon
Nelson, Peter
Popov, Velimir
Solomon, Rob
Stein, William
Stone, Goeff
Vietje, Brad
More authors (20 more) Less
Language :
English
Title :
Return of the King: Time-Series Photometry of FO Aquarii's Initial Recovery from its Unprecedented 2016 Low State
Alternative titles :
[en] Le du Roi: séries temporelles photométriques de FO Aquarii
Publication date :
09 December 2016
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
The american Astronomical Society
Volume :
883
Issue :
93
Pages :
7
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 29 May 2017

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