ASAS-SN Discovery of Five Bright CV Candidates

ATel #7260; A. B. Danilet, G. Simonian, K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, U. Basu, N. Goss, 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 (KIAA-PKU), P. R. Wozniak (LANL), E. Falco (CfA), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 20 Mar 2015; 18:02 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

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In addition to supernovae, the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or ``Assassin'') also discovers many other interesting transients, including numerous CVs. Since January 1st, 2015, we have discovered 99 CV candidates, which translates into a discovery rate of 1.25 CV/day.

Using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, and from the double 14-cm "Cassius" telescope in Cerro Tololo, Chile, we recently discovered five particularly bright transient sources, likely CVs:

 
Object        RA (J2000)    DEC (J2000)   Disc. UT Date   Disc. V mag 
ASASSN-15fd  05:56:41.11   -75:09:38.00    2015-03-15.12    14.2 
ASASSN-15fc  18:08:30.49    47:46:23.10    2015-03-18.62    13.4 
ASASSN-15fh  05:52:29.28    12:39:16.90    2015-03-19.25    14.0 
ASASSN-15fo  12:39:56.19   -47:16:24.00    2015-03-20.20    14.5 
ASASSN-15fp  12:02:51.49   -45:41:15.30    2015-03-20.23    14.4 

ASASSN-15fd was present in images obtained on 2015-03-15.12 at V=14.3, on 2015-03-16.15 at V=14.2, and on 2015-03-17.99 at V=13.2. It matches to a red source near the LMC with B=16.5, R=15.3. There is also a GALEX match. If the source is located in the LMC, it is not a CV, but rather another type of luminous transient, so follow-up is particularly encouraged in this case.

ASASSN-15fc was present in data on 2015-03-15.64 at V>17.0 and on 2015-03-18.62 at V=13.6. It matches to a B=20.8 object.

ASASSN-15fh was present in images obtained 2015-03-16.27 at V>16.7 and brightened to V=14.0 on 2015-03-19.25. The latest measurement taken on 2015-03-20.23 is of V=14.2. There is a 0.8" match to a j=21 source in The Guide Star Catalog.

ASASSN-15fo matches to B=18.3 source, V>17.2 on 2015-03-14.14, V=15.4 on 2015-03-19.41, V=14.5 on 2015-03-20.20.

ASASSN-15fp matches to B=19.5 source, possible precursor outburst with V=16.7 on 2015-03-15.17, V>17.5 on 2015-03-18.39, V=14.4 on 2015-03-20.23.

For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients. For real-time ASAS-SN data of known and newly discovered CV outbursts, see the ASAS-SN CV Patrol.

Happy Equinox!