ASAS-SN Discovery of a Possible Bright Galactic Nova ASASSN-17mt
ATel #10772; K. Z. Stanek, C. S. Kochanek, J. V. Shields, T. A. Thompson (OSU), L. Chomiuk, J. Strader (MSU), T. W.-S. Holoien, B. J. Shappee (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU)
on 24 Sep 2017; 18:50 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)
During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN,
Shappee
et al. 2014), using data from the quadruple 14-cm "Cassius"
telescope in CTIO, Chile, we detect a bright, new transient source,
possibly a classical nova (could also be a bright CV), near the
Galactic plane
Object RA (J2000) DEC (J2000) Gal l (deg) Gal b (deg) Disc. UT Date Disc. V mag
ASASSN-17mt 08:50:29.576 -47:45:28.56 267.191 -2.319 2017-09-24.39 11.3
ASASSN-17mt was discovered in images obtained on UT 2017-09-24.39
V~11.3, and it is also detected at UT 2017-09-23.40 at V~11.3. There
was an ~80-day seasonal gap before these observations, so the nova
candidate could have peaked already. We do not detect (V>16.9) this
object in subtracted images taken on UT 2017-07-07.95 and before.
Using ASAS-SN Sky Patrol
public all-sky light curve interface (Kochanek et
al. 2017), we have retrieved aperture photometry time series at
the location of ASASSN-17mt, and the resulting light curve can be seen
here.
No previous outbursts or variability are detected at the position of
ASASSN-17mt since ASAS-SN started observing this location in February
2016.
Follow-up observations, especially spectroscopy, are strongly encouraged.
We thank Las Cumbres Observatory and its staff for their continued
support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty
Moore Foundation through grant GBMF5490 to the Ohio State University,
NSF grant AST-1515927, the Mt. Cuba Astronomical Foundation, the
Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, and the
Chinese Academy of Sciences South America Center for Astronomy
(CASSACA). Happy Birthday to MtS.
