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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We studied the Kepler light curves of three SU UMa-type dwarf novae. Both thebackground dwarf nova of KIC 4378554 and V516 Lyr showed a combination ofprecursor-main superoutburst, during which superhumps always developed on thefading branch of the precursor. This finding supports the thermal-tidalinstability theory as the origin of the superoutburst. A superoutburst of V585Lyr recorded by Kepler did not show a precursor outburst and the superhumpsdeveloped only after the maximum light, a first example in the Kepler data sofar. Such a superoutburst is understood within the thermal-tidal instabilitymodel. The observation of V585 Lyr made the first clear Kepler detection of thepositive period derivative commonly seen in the "stage B" superhumps in dwarfnovae with short orbital periods. In all objects, there was no strong signatureof a transition to the dominating stream impact-type component of superhumps,suggesting that there is no strong indication of an enhanced mass-transferfollowing the superoutburst. We have determined the orbital period of V516 Lyrto be 0.083999(8) d. In V516 Lyr, some of outbursts were double outbursts in avarious degree. The preceding outburst in the double outburst was of theinside-out nature while the following one was of the outside-in nature. One ofsuperoutbursts in V516 Lyr was preceded by a double precursor. The precedingprecursor failed to trigger a superoutburst and the following precursortriggered a superoutburst by developing positive superhumps.

Analysis of Three SU UMa-Type Dwarf Novae in the Kepler Field