[vsnet-campaign-dn 15749] ASASSN-21ha (double) superoutburst (since May 2): two short rebrightenings

Fri Jun 4 04:38:16 JST 2021

 ASASSN-21ha (UGWZ)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=2221444

Recent ASAS-SN Sky Patrol light curve and data:
https://asas-sn.osu.edu/sky-patrol/coordinate/794fb490-4e7a-46c0-a2dc-6fc07ea78f9c

AAVSO observations (mainly by Josch Hambsch):
https://app.aavso.org/webobs/results/?star=ASASSN-21ha

Two short rebrightenings were observed on May 25 and 30-31.

A previous outburst was observed on 2018 September 22.395 UT by Gaia:
http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21crc/

Y. Tampo wrote (see message below):
>> This observation shows clear superhumps with a period of 0.636(1) d.
--> 0.0636(1) d
>> Therefore, ASASSN-21ha is likely a double-superoutburst (type-E) WZ Sge-type dwarf nova.
Has this likely outburst type been confirmed?

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
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Am Montag, 17. Mai 2021, 13:38:11 MESZ hat Yusuke Tampo Folgendes geschrieben:

ASASSN-21ha: double superoutburst (type-E) dwarf nova

Berto Monard reported further observations of ASASSN-21ha on 16th May.
This observation shows clear superhumps with a period of 0.636(1) d.
Therefore, ASASSN-21ha is likely a double-superoutburst (type-E) WZ
Sge-type dwarf nova.

Continued observations are encouraged.

Best,
Yusuke
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Am Montag, 17. Mai 2021, 05:47:03 MESZ hat Taichi Kato Folgendes geschrieben:

ASASSN-21ha fading and rebrightening

Josch Hambsch and Berto Monard have reported observations.
The object faded on May 13 and rebrightened on May 16.
There were not strong superhumps before the fading.
There was, however, some hint of a hump in Hambsch's data
on May 16.  Continued observations are encouraged.  
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