Follow-up Spectroscopy and Photometry of the 2021 Eruption of the Recurrent Nova M31N 2008-12a

ATel #15039; Kenta Taguchi (Kyoto University), Miho Kawabata (Kyoto University), Keisuke Isogai (Kyoto University), Yasuo Sano, K. Itagaki (Itagaki Observatory), Hiroyuki Maehara (National Astronomical Observatory of Japan)
on 15 Nov 2021; 17:33 UT
Credential Certification: Hiroyuki Maehara (hiroyuki.maehara@nao.ac.jp)

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We report follow-up spectroscopy and photometry of the 2021 eruption of the recurrent nova M31N 2008-12a (ATel #15034, #15036, #15037, #15038). We obtained a low-resolution spectrum of the nova on 2021-11-14.43 UT using the fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. 2019) mounted on the 3.8-m Seimei telescope (Kurita et al. 2020) at Okayama Observatory of Kyoto University. The spectrum shows broad Hα, He I (5876 Å), and N III emission lines (4640 Å) as reported in ATel #15036.

We also performed multicolor photometry of the nova. The magnitudes are given in the table below.

 
Date UT		  Exp. time		Filter 	Magnitude 	Instruments (Observer) 
2021-11-14.4676   300sec (30sec x 10)   g'      18.49 +/- 0.01  3.8-m + TriCCS (Kyoto U. team) 
2021-11-14.4676   300sec (30sec x 10)   r'      18.47 +/- 0.02  3.8-m + TriCCS (Kyoto U. team) 
2021-11-14.4676   300sec (30sec x 10)   i'      18.82 +/- 0.03  3.8-m + TriCCS (Kyoto U. team) 
2021-11-15.426    840sec (60sec x 14)   V       18.63 +/- 0.2   0.36-m + FLI ML1001 CCD (Y. Sano) 
2021-11-15.429    1140sec (60sec x 19)  Rc      18.16 +/- 0.2   0.36-m + FLI ML1001 CCD (Y. Sano) 
2021-11-15.5236   60sec                 none    18.8            0.35-m + KAF-1001E CCD (K. Itagaki) 
2021-11-15.5417   300sec (30sec x 10)   g'      18.98 +/- 0.04  3.8-m + TriCCS (Kyoto U. team) 
2021-11-15.5417   300sec (30sec x 10)   r'      18.87 +/- 0.04  3.8-m + TriCCS (Kyoto U. team) 
2021-11-15.5417   300sec (30sec x 10)   i'      18.77 +/- 0.05  3.8-m + TriCCS (Kyoto U. team) 

Low-resolution spectrum of M31N 2008-12a (2021-11-14.43)