A further study of superoutbursts and superhumps in SU UMa stars by the Kepler light curves of V1504 Cygni and V344 Lyrae

摘要

WemadeasupplementarystudyofthesuperoutburstsandsuperhumpsinSUUMastarsbyusingtherecentlyreleasedKeplerpublicdataofV1504CygandV344Lyr.OneofthesuperoutburstsinV1504Cygwasprecededbyaprecursornormaloutburstwhichwaswellseparatedfromthemainsuperoutburst.Thesuperhumpfirstappearedduringthedescendingbranchoftheprecursornormaloutburstanditcontinuedintoitsquiescence(thedeepdipbetweentheprecursorandthemainsuperoutburst),anditbegantogrowinamplitudewiththedevelopmentofthemainsuperoutburstafterthequiescenceended.AsimilarphenomenonwasalsoobservedinV344Lyr.Thisobservationveryclearlydemonstratesthatthesuperoutburstwastriggeredbythesuperhump(i.e.,bythetidalinstability),supportingthethermaltidalinstabilitymodel.Smak(2013,ActaAstron.,63,109)criticizedourpreviouspaper(Osakiamp;Kato,2013,PASJ,65,50)andchallengedourmainconclusionthatvariouslinesofobservationalevidenceofV1504CygsupportthethermaltidalinstabilitymodelforthesuperoutburstsofSUUMastars.Wepresentourdetailedaccountstoallofhiscriticismsbyofferingclearexplanations.Weconcludethatthethermaltidalinstabilitymodelis,afterall,onlytheviablemodelforthesuperoutburstsandsuperhumpsinSUUMastars.