[vsnet-alert 19080] Re: ASASSN-15pu: new WZ Sge-type dwarf nova

Josch Hambsch hambsch at telenet.be
Fri Sep 25 03:44:37 JST 2015

Dear Taichi,

Sampling rate was every 2 min an image so it was not "low sampling rate".
The period is about 86 min.



-----Original Message-----
From: vsnet-alert [mailto:vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp]
On Behalf Of Taichi Kato
Sent: Donnerstag, 24. September 2015 08:36

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

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

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.
                (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie
                J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo
                Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers
Observatory), E.
                Falco (CfA), P. R. Wozniak (LANL), G. Pojmanski (Warsaw
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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