Periodic modulations during a long outburst in V363 Lyr
Taichi Kato (Kyoto U)

TL;DR
This study analyzes Kepler data of V363 Lyr, identifying persistent orbital periods and long outburst modulations, exploring their origins as superhumps or tidal effects, and discussing implications for the system's mass ratio and secondary star.
Contribution
It presents the first detailed analysis of V363 Lyr's long and short cadence Kepler data, revealing long-period modulations and proposing interpretations related to superhumps and tidal interactions.
Findings
Detected a persistent orbital period of 0.185723 days.
Observed a long outburst with embedded precursor and modulations at 0.1956 days.
Discussed possible origins of long-period variations as superhumps or tidal effects.
Abstract
I analyzed the Kepler long and short cadence data of V363 Lyr. A period of 0.185723(8) d was persistently detected and this is identified as the orbital period. V363 Lyr showed one long outburst accompanied by an "(embedded) precursor" during Kepler observations and modulations with a period of 0.1956(2) d, longer than the orbital one, were detected during this outburst. There are two possible interpretations of this period. The first one is superhumps despite that V363 Lyr is far above the period gap. This interpretation requires an evolved, undermassive secondary enabling a low mass ratio of q=0.15. The evolution of this long-period variations, however, does not follow the standard evolution of superhumps. The second one is that the precursor occurred when the disk reached the tidal truncation radius, as inferred from observations of IW And stars. In this case, the long-period…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astrophysics and Star Formation Studies · Astro and Planetary Science
