ASAS-SN Discovery of Three Bright, Large Amplitude CV Outbursts Caught Early

ATel #6479; K. Z. Stanek, C. S. Kochanek, A. B. Davis, T. W.-S. Holoien, U. Basu, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 16 Sep 2014; 18:26 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

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During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from both the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii and the double 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered three new bright transient sources

 
Object        RA (J2000)    DEC (J2000)     Disc. UT Date   Disc. V mag  
ASASSN-14hi   18:57:46.67   +57:27:14.7     2014-09-16.30    15.2 
ASASSN-14hj   21:16:35.73   -07:49:10.6     2014-09-16.11    14.5 
ASASSN-14hk   01:39:35.68   +35:38:40.8     2014-09-16.60    14.7 

ASASSN-14hi was discovered at V=15.2 in "Brutus" images taken on 2014-09-16.30, but not present (V>17.5) in images taken on 2014-09-14.30. There is no matching source at Vizier at this position.

ASASSN-14hj was discovered at V=14.6 in "Cassius" images taken on 2014-09-16.11 and at V=14.4 in "Brutus" data taken on 2014-09-16.34, but not present (V>17.2) in "Brutus" images taken on 2014-09-15.36. There is a faint (g=22.4), blue SDDS object at this position, which, while classified as a galaxy, is most likely the cataclysmic variable in quiescence.

ASASSN-14hk was discovered in "Brutus" images taken on UT 2014-09-16.61 at V=14.7, but not present (V>16.7) in images taken on UT 2014-09-14.43. At the position of the transient Vizier reports a match to a faint, B=20.8 USNO-B1.0 source, and also a nearby GALEX NUV=21.9 source.

Given large amplitude of their outbursts, all three transients may be WZ Sge-type dwarf novae, caught early. Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.