Kavli Affiliate: Naoki Yasuda
| First 5 Authors: Weiyu Wu, Weiyu Wu, , ,
| Summary:
In recent years, with an increasing number of type Ia supernovae (SNe Ia)
discovered soon after their explosions, a non-negligible fraction of SNe Ia
with early-excess emissions (EExSNe Ia) have been confirmed. In this letter, we
present a total of textbf67 early-phase normal SNe Ia from published papers
and ongoing transient survey projects to systematically investigate their
photometric behaviors from very early time. We found that EExSNe Ia in our
sample have longer rise and brighter peak luminosities compared to those of
non-EExSNe Ia. Moreover, EExSNe Ia commonly have “red-bump" features in the
early $B-V$ color while non-EExSNe Ia show blueward evolution from the very
beginning. Here, we propose that the thin-helium double-detonation scenario can
phenomenologically explain the photometric diversities of normal SNe Ia
considering different white dwarf-He-shell mass combinations and the
viewing-angle effect, implying a unified explosion mechanism of normal-type SNe
Ia. To further testify the possible common origin of normal SNe Ia,
systematical studies of multiband photometric and spectral properties of
early-phase SNe Ia through the new generation wide-field time-domain survey
facilities and global real-time follow-up networks are highly demanded.
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