Nagashima, M.; Arai, A.; Isogai, M.; Arasaki, T.;
Kitao, E.; Taguchi, G.; Ikeda, Y.
; Kawakita, H.;
Yamanaka, M.; Itoh, R.; Sasada, M.; Okushima, T.; Uemura, M.;
Kawabata, K. S.; Worters, H. L.; Smits, D. P.
2013, IAU Symposium
Optical and near-infrared observations of novae give us useful
information for understanding the diversity of nova eruptions.
Classical nova V1723 Aql was discovered by F. Kabashima and K.
Nishiyama on 2010 September 11. We have conducted photometric and
spectroscopic observations of V1723 Aql in both optical and
near-infrared (NIR) wavelength regions since its discovery. The V-band
decline time by 2 mag after the maximum, t2, was ~12 d. The apparent
Fe II emission lines were also seen in the optical spectra. The R c-
and I c-band light curves exhibited rapid declines (0.16 mag d-1 in R
c) 20 days after the visual maximum, while the NIR (J, H, and K s)
showed slow decline rates (~0.07 mag d-1). This rapid reddening
suggests that dust particles formed during the very early phase of the
expansion in V1723 Aql.