[vsnet-alert 22996] ASASSN-19ct: possible helium dwarf nova wuth supercycle of 1 year

[Taichi Kato]

ASASSN-19ct: possible helium dwarf nova wuth supercycle of 1 year

ASASSN-19ct 	--- 	------- 	11:33:15.5 	-37:10:20.4 	2019-02-9.16 	13.75 	SDSS 	DSS 	VIZIER 	------- 	CV candidate, matches to GAIA DR2 G=17.5, many outbursts in CRTS, g>17.5 on 2019-02-08.21, g=14.1 on 2019-02-09.14, g=14.1 on 2019-02-09.16, g=17.0 on 2019-02-10.23, g>18.2 on 2019-02-11.25.

ASAS-SN data:
https://asas-sn.osu.edu/light_curves/5ed151a4-ad4a-4d78-a68a-aa6c21ca162c

   Most outbursts were superoutbursts.  As in 2018 April one,
the object showed a superoutburst, a dip and rebrightenings.
The other outbursts in 2014, 2015, 2016 and 2017 all showed
similar features.  Such a phenomenon is seen in helium
dwarf novae as in V803 Cen, but is only seen in rarely
superoutbursting WZ Sge systems in hydrogen-rich CVs.
Observations are strongly encouraged.
The very blue Gaia color and faint M_V (+7) at maximum
also support this classification.

IDs:
113315.367 -371020.35 (2000.0) Gaia_DR2_5386114565161537920 plx=4.277(0.120) dismod=6.8 pmra=4.010(0.169) pmdec=-25.698(0.107) G=17.480 BP=17.375 RP=17.409
113315.328 -371018.75 (2000.0) GALEX_DR5_6386150621886546117 NUV=17.195(0.033) FUV=17.284(0.046)
113315.369 -371021.27 (2000.0) GALEX_DR5_6386150622960291724 NUV=17.198(0.030) FUV=17.403(0.060)