[vsnet-alert 25688] ASASSN-21eo brighter?

[Patrick Schmeer pasc1312-aavso@yahoo.de via vsnet-alert]

 ASASSN-21eo (UG:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=2217367
 
ZTF light curve, data, and images (via Lasair):
https://lasair.roe.ac.uk/object/ZTF21aarlmkd/
ASASSN-21eo 20210404.1586 19.10zg ZTF
ASASSN-21eo 20210404.1736 18.73zr ZTF
ASASSN-21eo 20210406.1576 19.06zg ZTF
ASASSN-21eo 20210406.1734 18.60zr ZTF
ASASSN-21eo 20210408.1830 17.98zr ZTF
ASASSN-21eo 20210408.1963 18.06zg ZTF
 
Recent ASAS-SN Sky Patrol light curve and data:
https://asas-sn.osu.edu/sky-patrol/coordinate/64f724c6-1ea5-4a75-86cd-b318e5b2c271
 
AAVSO data:
https://app.aavso.org/webobs/results/?star=ASASSN-21eo

Y. Tampo wrote (see message below):
> This object has already faded by ~2 mag in 2 days,
> suggesting ASASSN-21eo can be an AM CVn star,
> or less likely double superoutburst WZ Sge-type
> dwarf nova.
Could that short outburst (2021 March 31 - April 2)
have been a (short = normal) precursor outburst?
 
Confirmation of the possible rebrightening is required.
 
Clear skies,
Patrick
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References:
All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol:
- Shappee et al., 2014ApJ...788...48S
- Kochanek et al., 2017PASP..129j4502K
Lasair:
- Smith et al., 2019RNAAS...3...26S
Zwicky Transient Facility (ZTF):
- Masci et al., 2019PASP..131a8003M
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     Am Freitag, 2. April 2021, 14:32:34 MESZ hat 反保雄介 <tampo at kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  
 
 ASASSN-21eo: AM CVn star candidate?

Kyoto Univ. Obs., Sano-san, and Itoh-san have reported the observation of
ASASSN-21eo (= TCP J06161010+1243200). This outburst was detected on 31st
March by ASAS-SN at 13.8 mag (see vsnet-alert 25620, 25625). The quiescence
counterpart is ~21 mag in ZTF DR5 data, therefore the outburst amplitude is
~7 mag.
This object has already faded by ~2 mag in 2 days, suggesting ASASSN-21eo
can be an AM CVn star, or less likely double superoutburst WZ Sge-type
dwarf nova.

Daily snapshots are highly recommended to catch the onset of its second
superoutburst.

ASASSN-21eo 20210331.232 13.794g ASASSN
ASASSN-21eo 20210401.418 15.368C Sano
ASASSN-21eo 20210401.455 15.604CV KU
ASASSN-21eo 20210401.483 >14.0C Itoh
ASASSN-21eo 20210402.207 16.887zr ZTFLasair
ASASSN-21eo 20210402.236 15.457g ASASSN <- can be contaminated
ASASSN-21eo 20210402.469 >15.4C KU

Yusuke


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京都大学大学院理学研究科宇宙物理学教室 D1
Kyoto University, Graduate School of Department of Astronomy, PhD candidate
反保 雄介 Yusuke TAMPO
MAIL: tampo at kusastro.kyoto-u.ac.jp

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