Nova Mus 2018 (PNV J11261220-6531086) Is Forming Dust
ATel #11298; Frederick M Walter
on 14 Feb 2018; 16:16 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Fred Walter (firstname.lastname@example.org)
Subjects: Infra-Red, Optical, Nova
Referred to by ATel #: 11377
Nova Mus 2018 (PNV J11261220-6531086) was discovered by R Kaufman
on 2018 Jan 14.486, and reported by P. Schmeer in vsnet-alert 21772.
The first detection was 2018 Jan 3.24 (ASAS-SN, reported in the TOCP).
T.C. Bohlson reported that it is an Fe II nova (ATel #11183).
It has not yet been detected at radio (Ryder et al., ATel #11212) or X-ray
(Nelson et al., ATel #11220) wavelengths, but Li et al. have reported a possible
γ-ray detection (ATel #11201).
I have been following the nova with the SMARTS Andicam dual channel photometer
in the BVRIJHK bands since JD 2458136.81 (2018 Jan 17). Since then
the nova has faded by about 2 mag to V=9.0 on JD 2458162.73, with little
change in the optical colors. Between JD 2458155 and 2458157 (at the tender age of 33 - 35 days)
the nova started producing dust.
The K magnitude has decreased by 0.18 mag/day, from K~5.2 to 4.5,
since JD 2458157.
The brightness in the H band started to increase about 4 days after the K
band, and the nova is flat at J. During that time the BVRI magnitudes
have faded by about 0.07 mag/day. The B-V color is showing signs of
increasing, possibly suggesting the start of a dust dip.
Plots and numbers are available in the Stony Brook/SMARTS Nova Atlas at http://www.astro.sunysb.edu/fwalter/SMARTS/NovaAtlas/nmus2018/phot/nmus2018.phot.html
Observers interested in dust formation in novae are encouraged to obtain
Photometry and high-resolution optical spectroscopy continues from SMARTS.
I thank B. Cruz For scheduling the observations. FMW's participation in
the SMARTS partnership is supported by the NSF and by a generous grant from the
office of the Provost of Stony Brook University.