English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We investigate K2BS5, an optical transient that we identified in Campaign 13of the Kepler/K2 archives by the "K2 Background Survey", and classify it as anew SU UMa-type dwarf nova. Using the light curve generated from Kepler'slong-cadence observation mode, we analyze the dwarf nova during quiescence andsuperoutburst. Following 20 days of quiescence at the start of the observation,the system entered a superoutburst lasting 12 days, after which it experiencedat least one rebrightening. K2BS5 clearly meets the criteria for an SU UMastar, but at the peak of the superoutburst, it also shows double-waveoscillations consistent with the spectroscopic orbital period, a phenomenonthat closely resembles early superhumps in WZ Sge stars. While we do notclassify K2BS5 as a WZ Sge system, we discuss how this phenomenon couldcomplicate efforts to use the suspected detection of early superhumps todistinguish SU UMa-type dwarf novae from the recently recognized class oflong-orbital-period WZ Sge systems.

A Phenomenon Resembling Early Superhumps in a New SU UMa-Type Dwarf Nova with a 2-Hour Orbital Period