New Candidates for AM Canum Venaticorum Stars among ASAS-SN Transients
arXiv:2107.07091 · doi:10.1093/pasj/psab080
Abstract
We studied Zwicky Transient Facility (ZTF) light curves of 34 dwarf nova candidates discovered by All-Sky Automated Survey for Supernovae (ASAS-SN) between 2020 May 12 and September 9 and found 6 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.
arXiv comment9 pages, 6 figures, with test.R, accepted for publication in PASJ
References in corpus (29)
- The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
- First Results from the Catalina Real-time Transient Survey
- The Zwicky Transient Facility: Data Processing, Products, and Archive
- ATLAS: A High-Cadence All-Sky Survey System
- The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
- Catalogue of cataclysmic binaries, low-mass X-ray binaries and related objects (Seventh edition)
- A systematic search of Zwicky Transient Facility data for ultracompact binary LISA-detectable gravitational-wave sources
- Early humps in WZ Sge stars
- WZ Sge-Type Dwarf Novae
- Ultracompact AM CVn Binaries from the Sloan Digital Sky Survey: Three Candidates Plus the First Confirmed Eclipsing System
- A search for the hidden population of AM CVn binaries in the Sloan Digital Sky Survey
- Models of AM CVn star outbursts
- Long-term Photometric Behavior of Outbursting AM CVn Systems
- Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. V: The Fifth Year (2012-2013)
- Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. VII: The Seventh Year (2014-2015)
- Superhumps and Repetitive Rebrightenings of the WZ Sge-Type Dwarf Nova, EG Cancri
- The long term optical behaviour of helium accreting AM CVn binaries
- A census of AM CVn stars: three new candidates and one confirmed 48.3-minute binary
- Optical and Near-Infrared Photometric Observation during the Superoutburst of the WZ Sge-Type Dwarf Nova, V455 Andromedae
- A systematic search for outbursting AM CVn systems with the Zwicky Transient Facility
- SSS J122221.7-311523: Double Superoutburst in a Best Candidate Period Bouncer
- Discovery of a WZ Sge-Type Dwarf Nova, SDSS J102146.44+234926.3: Unprecedented Infrared Activity during a Rebrightening Phase
- V1006 Cygni: Dwarf Nova Showing Three Types of Outbursts and Simulating Some Features of the WZ Sge-Type Behavior
- Evidence that short period AM CVn systems are diverse in outburst behaviour
- Optical Dual-Band Photometry and Spectroscopy of the WZ Sge-Type Dwarf Nova EZ Lyn during the 2010 Superoutburst
- Multi-Color Photometry of the Outburst of the New WZ Sge-type Dwarf Nova, OT J012059.6+325545
- NSV 1440: First WZ Sge-type Object in AM CVn stars and candidates
- ASASSN-14cc: Likely Helium Analog of RZ Leonis Minoris
- ASASSN-14ho: Longest-period Dwarf Nova with Multiple Rebrightenings
Cited by in corpus (5)
- A Catalogue of Ultracompact Mass-Transferring White Dwarf Binaries
- He-star donor AM CVn stars and their progenitors as LISA sources
- Machine Learning based search for Cataclysmic Variables within Gaia Science Alerts
- Four new eclipsing accreting ultracompact white dwarf binaries found with the Zwicky Transient Facility
- Machine Learning applications for Cataclysmic Variable discovery in the ZTF alert stream