[vsnet-alert 25914] ZTF21abcnlpj: new SU UMa-type dwarf nova

[tonny.vanmunster@gmail.com via vsnet-alert]

Dear colleagues,

I have just finished analysing my unfiltered CMOS observations of ZTF21abcnlpj, obtained on 2021, May 27/28 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera under clear skies. My observations were triggered by the below report of Kenta Taguchi-san.

Regular superhumps with an amplitude of 0.38 mag are clearly visible in the resulting (detrended) light curve, establishing ZTF21abcnlpj as a new SU UMa-type dwarf nova. A period analysis using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0), yields a combined superhump period of 0.0567 +/- 0.0003d. The object was at mag CV = 15.4 on May 27th.

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

Best regards
Tonny

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Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
http://www.cbabelgium.com

PERANSO : The Light Curve and Period Analysis Software http://www.peranso.com

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-----Original Message-----
From: vsnet-alert <vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp> On Behalf Of Kenta TAGUCHI
Sent: Thursday, 27 May 2021 15:14
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
Subject: [vsnet-alert 25911] ZTF21abcnlpj: a large-amplitude CV candidate

Using my private scraping system, I've just found ZTF21abcnlpj out as a large-amplitude CV candidate from the public ZTF data.
Lasair: https://lasair.roe.ac.uk/object/ZTF21abcnlpj/
ALeRCE: https://alerce.online/object/ZTF21abcnlpj/
MARS: https://mars.lco.global/?objectId=ZTF21abcnlpj

According to ALeRCE, the position is (RA, Dec) =(17:52:01.13, +49:22:46.6).

Last non-detections:
r > 20.1521 on 2021-05-23.4468 (ZTF, 'difference mag' via ALeRCE) g > 16.364 on 2021-05-25.2194 (ASAS-SN)

First detections by ZTF:
r = 15.152 on 2021-05-27.3673 (ZTF, 'difference mag' via ALeRCE) g = 14.904 on 2021-05-27.4520 (ZTF, 'difference mag' via ALeRCE)

This is the result of ASAS-SN Sky Patrol: 
https://asas-sn.osu.edu/sky-patrol/coordinate/0cad21a4-f45b-40b4-ba76-c439dd8ffe0d
It looks no past outbursts are recorded.

There is a possible red counterpart in PS1 data: r = 21.47, i = 20.13, y = 19.82, and z = 19.96.
It's position is (RA, Dec) =(17:52:01.14, +49:22:46.2).
g magnitude is not recorded in PS1 mean object catalog.

No known minor planets are found by the Minor Planet Checker (https://www.minorplanetcenter.net/cgi-bin/checkmp.cgi).

Since r is brightened by 6.32 mag and g is by ~ 8 mag (assuming PS1 limiting g ~ 23 mag), I think it is a large-amplitude CV candidate.

Best Regards and clear skies,
Kenta
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________________________________________________________________
  田口 健太　(TAGUCHI, Kenta)
  京都大学大学院理学研究科宇宙物理学教室
  (Department of Astronomy, Graduate School of Science, Kyoto University) kentagch at kusastro.kyoto-u.ac.jp <mailto:kentagch at kusastro.kyoto-u.ac.jp>
  09090536980