S19B0023abst
S19B0023
As the booming development of wide-field survey facilities, breakthroughs in time-domain astronomy have been made in recent years. 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. In S19B, the HSC Subaru Strategic Program (HSC SSP) will do g-band imaging for βΌ60 deg2 with a limiting magnitude of 26.5 in a single night, which gives a great opportunity to carry out the second observing run of our HSC transient survey project, MUltiband Subaru Survey for Early-phase SNe Ia (MUSSES) by combining the HSC SSP and open-use time (the first observing run was successfully carried out in S16A). In the second observing run, two dozen of SNe Ia within about three days of their explosions can be discovered. In particular, we expect to discover 1) about four SNe Ia that show peculiar light-curve excess at early time and 2) at least two ultra-early normal-type SNe Ia with luminosities over 500 times fainter than their peaks, which will provide the tightest constraint or even conclusive evidence for their progenitor system and explosion mechanism for the first time.
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