S20B0018abst
S20B0018
As the booming development of wide-field survey facilities, breakthroughs in time-domain astronomy have been made in 2010s. The large aperture of the Subaru telescope and the wide field of the Hyper Suprime-Cam (HSC) make Subaru/HSC the most powerful survey facility of studying Type Ia supernovae (SNe Ia) soon after their explosions. Here, we propose a 10 half-night deep multiband imaging survey which is optimized to catch the first light of SNe Ia at redshifts below 0.2. By balancing the observing depth, survey period, and total survey area of the Subaru/HSC observation, a dozen of ultra-early SNe Ia with brightness >∼ 300 times fainter than the peak can be discovered, and particularly, the deepest photometry of early-phase SNe Ia by far (i.e. even deeper than that of the best-observed SN Ia in history, SN 2011fe) can be promisingly achieved. The ultra-deep photometry of the HSC ultra-early SNe Ia not only can tightly constrain or directly identify/rule out specific kinds of single-degenerate progenitor systems but also can test the double white-dwarf merger scenario by constraining the nearby CSM distribution for the first time. Breakthroughs on the long-standing progenitor issue of SNe Ia can be achieved through the unique program.
This document was translated from LATEX by HEVEA.