OISTER Follow-up Observations of the bright Type IIP supernova SN 2017eaw

Type IIP supernovae (SNe IIP) exhibit the absorption lines of the Balmer series in their spectra and the plateau phases in the optical light curves. Their progenitors are widely thought to be the red supergiant star having the abundant hydrogen envelope. Their light curves and spectral properties in optical wavelength were well studied, but the near-infrared evolutions are still unclear. We present the follow-up observations of the bright SN IIP 2017eaw in the optical and near-infrared wavelengths through the Target-of-Opportunity (ToO) in the framework of the Optical and Infrared Synergetic Telescopes for Education and Research (OISTER). We obtained the extensive dataset of the Bg'VRIJHK_s-band light curves and optical spectra. The light curves and spectral properties in optical show the similarity with those of the typical SNe IIP. We found that the near-infrared fraction evolved to 50\% at 120 days after the explosion date. Thereafter, the fraction slowly decreased at 200 days.