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Coherent brightness modulations in the dwarf nova AT Cancri

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arxiv 1809.05640 v1 pith:75FCOC7V submitted 2018-09-15 astro-ph.SR

Coherent brightness modulations in the dwarf nova AT Cancri

Albert Bruch , James Boardman , Lewis M. Cook , Michael J. Cook , Shawn Dvorak , James L. Jones , John W. Rock , Geoffrey Stone
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Joseph H. Ulowetz
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classification astro-ph.SR
keywords periodmodulationdaysdwarfinterpretnovatimeaccurate
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Light curves of the Z Cam type dwarf nova AT Cnc observed during standstill in 2016 and 2018 are analyzed. On the time scale of hours, previous reports on periodicities, in particular the presence of negative superhumps, could not be confirmed. Instead, a modulation with a period equal to the spectroscopic orbital period was detected which we thus interpret as a manifestations of the binary revolution. It enables us to derive a more accurate value of 0.201634 $\pm$ 0.000005 days (or its alias of 0.021580 days) for the period. AT Cnc also exhibits a hitherto unreported modulation of 25.731 $\pm$ 0.005 min, stable in period but not in amplitude over the entire time base of two years of the observations. We tentatively interpret this modulation in the context of an intermediate polar model for the system.

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Cited by 3 Pith papers

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  1. Cataclysmic Variables Photometric Periods from TESS

    astro-ph.SR 2026-07 accept novelty 6.5

    TESS data give photometric periods for 1362 cataclysmic variables (hundreds new), confirming the 2–3 h gap, a sample median of 3.68 h, and spin periods for 83 intermediate polars.

  2. Cataclysmic Variables Photometric Periods from TESS

    astro-ph.SR 2026-07 conditional novelty 6.0

    TESS photometry yields coherent periods for 1,362 CVs, including roughly 465–565 first determinations, and confirms the 2–3 h period gap with a median period near 3.68 h.

  3. Cataclysmic Variables Photometric Periods from TESS

    astro-ph.SR 2026-07 conditional novelty 5.0

    TESS photometry of 1,362 cataclysmic variables yields 565 new period measurements, confirms the 2–3 h period gap, and finds a median CV photometric period of 3.681 h.