[vsnet-alert 18555] Re: ASASSN-15hd: new SU UMa-type dwarf nova

Taichi Kato tkato at kusastro.kyoto-u.ac.jp
Fri Apr 17 15:01:38 JST 2015

Re: ASASSN-15hd: new SU UMa-type dwarf nova

> The resulting light curve
> covers a time span of 3.9 hours and clearly shows the presence of
> large-amplitude superhumps, hence establishing this target as a new SU
> UMa-type dwarf nova. The sumperhump amplitude is approx 0.3 mag. A period
> analysis using the ANOVA, Lomb-Scargle and PDM methods (Peranso), yields a
> period of 0.055 +/- 0.001d only.

   The light curve looks like to me that of early superhumps.
If it is the case, the object is a rare example of
WZ Sge-type dwarf novae with prominent early superhumps
(only a few percent of all WZ Sge-type objects).
Multicolor and spectroscopic observations are also encouraged.

(ASAS-SN data)

ASASSN-15hd 	--- 	------- 	17:31:25.39 	27:54:29.3 	2015-04-15.46 	14.02 	SDSS 	DSS 	VIZIER 	------- 	bright, high-amplitude CV candidate, matches to a blue g=21.8 SDSS object, V>17.2 on 2015-04-12.46, V=14.0 on 2015-04-15.46

ASASSN-15hd 20150412.46 <172V ASN
ASASSN-15hd 20150415.46 14.0V ASN

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