[vsnet-alert 24817] ZTF20acjpwas: new WZ Sge-type dwarf nova (instead of SU UMa-type)

Sun Oct 18 19:38:45 JST 2020

Dear colleagues,

I just inspected my 2020, Oct 17/18 light curve with my newest CCD observations of ZTF20acjpwas = AT 2020wup. It clearly shows the presence of a double-waved superhump structure, indicating (as I suspected in my email below), the WZ Sge-type nature of this dwarf nova.

I will send my observations to AAVSO, CBA and VSNET for further analysis.

Follow-up observations are recommended to refine the superhump period.

Best regards
Tonny

--
Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
www.cbabelgium.com
Beta testers wanted for Peranso 3.0

-----Original Message-----
From: cba-chat [mailto:cba-chat-bounces at cbastro.org] On Behalf Of Tonny Vanmunster
Sent: zaterdag 17 oktober 2020 20:34
To: cba-chat at cbastro.org; 'Taichi Kato'; 'ALERT, VSNET'; vsnet-campaign-dn at ooruri.kusastro.kyoto-u.ac.jp; vsnet-newvar at yahoogroups.com; 'vsnet-outburst'
Subject: (cba:chat) ZTF20acjpwas: new SU UMa-type dwarf nova

Dear colleagues,

I have just finished the analysis of my unfiltered CCD observations of ZTF20acjpwas = AT 2020wup, obtained on 2020, Oct 16/17 at CBA Extremadura Observatory, using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. 

Superhumps with an amplitude of 0.27 mag are clearly visible in my light curve, establishing ZTF20acjpwas as a new SU UMa-type dwarf nova (considering the large outburst amplitude of 7 mag, a classification as WZ Sge-type dwarf nova is not excluded).  A period analysis using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0, in Beta testing), yields a combined superhump period of 0.0592 +/- 0.0008d. The object was at mag 15.2 (CV) on Oct 17th.

I will send my observations to AAVSO, CBA and VSNET for further analysis.

Follow-up observations are recommended to refine the superhump period.

Best regards
Tonny

--
Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
www.cbabelgium.com
Beta testers wanted for Peranso 3.0 