ASAS-SN Discovery of a Very Young Galactic Nova Candidate ASASSN-17nj
ATel #10850; K. Z. Stanek, C. S. Kochanek, J. V. Shields, T. A. Thompson (OSU), L. Chomiuk, J. Strader (MSU), B. J. Shappee (IfA, Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU)
on 14 Oct 2017; 17:07 UT
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During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN,
et al. 2014), using data from the quadruple 14-cm "Cassius"
telescope in CTIO, Chile, we detect a new transient source, possibly a
classical nova (could also be a bright CV), close to the Galactic
Object RA (J2000) DEC (J2000) Gal l (deg) Gal b (deg) Disc. UT Date Disc. V mag
ASASSN-17nj 17:30:34.18 -31:06:06.80 356.424 1.586 2017-10-14.01 14.0
ASASSN-17nj was discovered in images obtained on UT 2017-10-14.01
at V~14.0. We do not detect (V>17.4) this object in subtracted images
taken on UT 2017-10-13.10, so this transient was less than 1-day old at
the discovery epoch.
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-17nj, and the resulting light curve can be seen
this link. No previous outbursts or variability are detected at the
position of ASASSN-17nj since ASAS-SN started observing this location
in March 2016.
Follow-up observations, especially multi-band photometry and
spectroscopy, are strongly encouraged. If ASASSN-17nj is a classical
nova, its color should be significantly affected by the large amount
of interstellar extinction expected in this direction (A_V~12,
Schlafly & Finkbeiner 2011).
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