[vsnet-alert 19074] ASASSN-15pu: new WZ Sge-type dwarf nova

Taichi Kato tkato at kusastro.kyoto-u.ac.jp
Thu Sep 24 15:35:55 JST 2015

ASASSN-15pu: new WZ Sge-type dwarf nova

   Berto Monard and Josch Hambsch have reported observations.
Monard's data on Sep. 19 showed double-wave early superhumps
with a period of 0.0600(4) d.  Only two days later, Hambsch's
data did not show a strong signal (maybe due to low sampling
rate).  The long period of early superhumps and large
outburst amplitude may suggest a period bouncer.


ATEL #8068                                                           ATEL #8068

Title:  Bright, High-Amplitude CV Candidate ASASSN-15pu 
Author: K. Z. Stanek, C. S. Kochanek, G. Simonian, J. S. Brown, T.
                W.-S. Holoien, D. Godoy Rivera, U. Basu, J. F. Beacom, T. A. Thompson
                (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories),
                J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong,
                Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory), E.
                Falco (CfA), P. R. Wozniak (LANL), G. Pojmanski (Warsaw University
Queries:        stanek.32 at osu.edu
Posted: 18 Sep 2015; 20:35 UT
Subjects:Optical, Cataclysmic Variable

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or

"Assassin"), using data from the quadruple 14-cm "Cassius" telescope 
in CTIO, Chile, we discovered a new transient source:

Object        RA (J2000)    DEC (J2000)     Disc. UT Date   Disc. V mag

ASASSN-15pu   21:11:04.689 -39:56:33.97     2015-09-18.2     

ASASSN-15pu was discovered at V=13.7 in "Cassius" images taken on 
2015-09-18.206, but not present (V>17.0) in images taken on 
2015-09-13.18. At the position of the transient, Vizier reports only 
one match, to a faint j=22.1 GSC2 source.

Given the large amplitude of its outburst, this transient may be a WZ 
Sge-type dwarf nova. Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of 
ASAS-SN. ASAS-SN is supported by NSF grant AST-1515927, the Mt. Cuba 
Astronomical Foundation, and the Center for Cosmology and 
AstroParticle Physics (CCAPP) at OSU. For more information about the 
ASAS-SN project, see the <A 
Homepage</a> and the list of all <a 


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