New candidates for AM Canum Venaticorum stars among ASAS-SN transients

Kato, Taichi; Kojiguchi, Naoto

doi:10.1093/pasj/psab080

Title: New candidates for AM Canum Venaticorum stars among ASAS-SN transients

Journal Article · 05 August 2021 · Publications of the Astronomical Society of Japan

DOI: https://doi.org/10.1093/pasj/psab080 · OSTI ID:1812103

Kato, Taichi; Kojiguchi, Naoto

Abstract We studied Zwicky Transient Facility (ZTF) light curves of 34 dwarf nova candidates discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) between 2020 May 12 and September 9 and found six AM CVn-type candidates. All objects showed short outbursts (post-superoutburst rebrightenings) on the fading tail. Two objects (ASASSN-20eq, ASASSN-20la) showed double superoutbursts. Three objects (ASASSN-20jt, ASASSN-20ke, and ASASSN-20lr) showed short superoutbursts (5–6 d). These features in the light curve can be used in discriminating AM CVn-type candidates from hydrogen-rich systems. In contrast to hydrogen-rich systems, some object did not show red color excess during the rebrightening or fading tail phase. We interpret that this is due to the higher ionization temperature in helium disks. Two objects had long (likely) supercycles: ASASSN-20gx (8.5 yr) and ASASSN-20lr (7 yr). We provide a scheme for identifying AM CVn-type candidates based on the light curve characteristics.

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Sponsoring Organization:: USDOE

OSTI ID:: 1812103

Journal Information:: Publications of the Astronomical Society of Japan, Journal Name: Publications of the Astronomical Society of Japan Journal Issue: 5 Vol. 73; ISSN 0004-6264

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: Japan

Language:: English

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