학술논문
Swift Deep Galactic Plane Survey Classification of Swift J170800$-$402551.8 as a Candidate Intermediate Polar Cataclysmic Variable
Document Type
Working Paper
Author
O'Connor, B.; Gogus, E.; Hare, J.; Mukai, K.; Huppenkothen, D.; Brink, J.; Buckley, D. A. H.; Levan, A.; Baring, M. G.; Stewart, R.; Kouveliotou, C.; Woudt, P.; Bellm, E.; Cenko, S. B.; Evans, P. A.; Granot, J.; Hailey, C.; Harrison, F.; Hartmann, D.; van der Horst, A. J.; Kaper, L.; Kennea, J. A.; Potter, S. B.; Slane, P. O.; Stern, D.; Wijers, R. A. M. J.; Younes, G.
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Subject
Language
Abstract
Here, we present the results of our multi-wavelength campaign aimed at classifying \textit{Swift} J170800$-$402551.8 as part of the \textit{Swift} Deep Galactic Plane Survey (DGPS). We utilized Target of Opportunity (ToO) observations with \textit{Swift}, \textit{NICER}, \textit{XMM-Newton}, \textit{NuSTAR}, and the Southern African Large Telescope (SALT), as well as multi-wavelength archival observations from \textit{Gaia}, VPHAS, and VVV. The source displays a periodicity of 784 s in our \textit{XMM-Newton} observation. The X-ray spectrum (\textit{XMM-Newton} and \textit{NuSTAR}) can be described by thermal bremsstrahlung radiation with a temperature of $kT$\,$\approx$\,$30$ keV. The phase-folded X-ray lightcurve displays a double-peaked, energy-dependent pulse-profile. We used \textit{Chandra} to precisely localize the source, allowing us to identify and study the multi-wavelength counterpart. Spectroscopy with SALT identified a Balmer H$\alpha$ line, and potential HeI lines, from the optical counterpart. The faintness of the counterpart ($r$\,$\approx$\,$21$ AB mag) favors a low-mass donor star. Based on these criteria, we classify \textit{Swift} J170800$-$402551.8 as a candidate intermediate polar cataclysmic variable, where the spin period of the white dwarf is 784 s.
Comment: Accepted in MNRAS
Comment: Accepted in MNRAS