Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. X: The Tenth Year (2017)

TL;DR

This paper presents a comprehensive survey of superhump period variations in 102 SU UMa-type dwarf novae observed in 2017, providing new mass ratios and insights into their evolutionary stages.

Contribution

It offers the tenth-year update on superhump period variations, including new mass ratios and characterization of specific objects, expanding understanding of dwarf novae behavior.

Findings

Identified new WZ Sge-type stars and characterized their superhump behavior.

Derived new mass ratios for 7 objects using stage A superhumps.

Documented objects in the period gap with long-lasting stage A superhumps.

Abstract

Continuing the project described by Kato et al. (2009, PASJ, 61, S395, arXiv/0905.1757), we collected times of superhump maxima for 102 SU UMa-type dwarf novae observed mainly during the 2017 season and characterized these objects. WZ Sge-type stars identified in this study are PT And, ASASSN-17ei, ASASSN-17el, ASASSN-17es, ASASSN-17fn, ASASSN-17fz, ASASSN-17hw, ASASSN-17kd, ASASSN-17la, PNV J20205397+2508145 and TCP J00332502-3518565. We obtained new mass ratios for 7 objects using growing superhumps (stage A). ASASSN-17gf is an EI Psc-type object below the period minimum. CRTS J080941.3+171528 and DDE 51 are objects in the period gap and both showed long-lasting phase of stage A superhumps. We also summarized the recent advances in understanding of SU UMa-type and WZ Sge-type dwarf novae.