(Proposal ID) S15B-033

(PI) Tominaga, Nozomu

(Proposal Title)
Detection and Follow-up Observations of Type II Plateau Supernovae

(Abstract)
Shock breakout is the brightest phenomenon in a normal core-collapse supernova 
(CCSN). We have started shock breakout surveys with HSC from the S14A semester.
 Our past HSC and FOCAS observations (S14A-191, S14B-048, and S14B-061) 
detected ~20 shock breakout candidates and confirmed 4 objects at redshifts as 
high as the highest-z record of normal CCSNe (z>0.5), and our first paper on 
SHOOT14a is submitted. However, SHOOT14a is so faint that no supernova feature 
is found in its spectrum and the single-epoch observation could not reveal the 
evolution of SHOOT14a. Therefore, in order to obtain multicolor light curves 
(LCs) and spectra continuously from the shock breakout to the plateau, we 
propose 2-continuous-night HSC imaging observations in g and r bands and queue-
mode GMOS imaging and/or spectroscopic observations at 1, 2, 3, ~7, ~14, ~30, 
~45, and ~60 days after the HSC observation. In contrast to our previous 
observations, we focus on the detection of relatively low-z shock breakout. 
The unprecedented 5-continuous-nights multicolor light curves and spectra 
comprehensively test theoretical models from the shock breakout to the 
plateau. These allow the Subaru telescope to keep leading the shock breakout 
study.