[vsnet-alert 25342] ZTF20acyxwzf: WZ Sge-type AM CVn star?

[反保雄介]

ZTF20acyxwzf: WZ Sge-type AM CVn star?

Kyoto Univ. Observatory, Itoh-san, and Kubotera-san reported observation
of ZTF20acyxwzf.
According to ZTF broker lasair, this object already faded ~4 mag from the
peak in 2 d.

20210205.422 13.303g ASN
20210205.472 14.265zg ZLR
20210205.435 14.177zr ZLR
20210206.416 14.817zg ZLR
20210206.468 15.203zr ZLR
20210207.512 17.166zr ZLR
https://lasair.roe.ac.uk/object/ZTF20acyxwzf/

PDM analysis yields the variation period of ~0.04 d, which can be a early
superhump.

Combining these features, ZTF20acyxwzf can be a AM CVn star showing WZ
Sge-type superoutbursts.
More continuas observations are needed to confirm this classification and
to detected the second superoutburst with ordinary superhumps.

Best regards,
Yusuke



2021年2月6日(土) 1:34 Kojiguchi Naoto <kojiguchi at kusastro.kyoto-u.ac.jp>:

> ASASSN Sky Patrol:
>
> https://asas-sn.osu.edu/sky-patrol/coordinate/f1fe7c78-cbb9-4fcd-b53e-1299f69056ce
>
> On 2021/02/06 1:16, Kojiguchi Naoto wrote:
> > ZTF20acyxwzf =ASASSN-21au: possible WZ Sge star
> >
> >     Large outburst amplitude of 7 mag. According to the ASASSN data, no
> past outburst.
> > The ZTF data clearly indicate ~1 mag brightening and redding between
> 2020 June and before outburst (e.g. vsnet-alert 23441).
> >
> > ASASSN infomation:
> > 14:23:52.86 +78:30:13.0
> > https://twitter.com/SuperASASSN/status/1357693824378621952
> > https://twitter.com/SuperASASSN/status/1357703053558894592
> >
> > Lasair:
> > https://lasair.roe.ac.uk/object/ZTF20acyxwzf/
> >
> > IDs:
> > 142352.812 +783013.331 Gaia_EDR3_1714575958453248000 Plx=-(-) pmRA=-(-)
> pmDE=-(-) G=20.923672(0.019084) BP-RP=0.077957
> > 142352.824 +783013.272 PS1_202202159703645164 g=20.9555(0.0592)
> r=21.0433(0.0918) i=21.3549(0.0364) z=20.7246(0.1677)
> > 142352.948 +783013.255 GALEXJ142352.9+783013 NUV=21.3876(0.3395)
> >
> > ZTF20acyxwzf =ASASSN-21au
> >     20210203.451 19.135zr ZLR
> >     20210204.500 <14.357g ASN
> >     20210204.455 17.826zg ZLR
> >     20210204.408 18.011zr ZLR
> >     20210205.422 13.303g ASN
> >     20210205.472 14.265zg ZLR
> >     20210205.435 14.177zr ZLR
>


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京都大学大学院理学研究科宇宙物理学教室 M2
Kyoto University, Graduate School of Department of Astronomy, M2
反保 雄介 Yusuke TAMPO
MAIL: tampo at kusastro.kyoto-u.ac.jp

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