A Common Origin of Normal Type Ia Supernovae Suggested by the Photometric Diversity
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2025
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| author | Wu, Weiyu Jiang, Ji-an Meng, Dezheng Xu, Zelin Maeda, Keiichi Doi, Mamoru Nomoto, Ken'ichi Yasuda, Naoki Tanaka, Masaomi Shigeyama, Toshikazu Tominaga, Nozomu Ivezić, Željko Yoachim, Peter Jha, Saurabh W. Wang, Tinggui Suzuki, Nao Furusawa, Hisanori Connolly, Andrew J. Miyazaki, Satoshi |
| author_facet | Wu, Weiyu Jiang, Ji-an Meng, Dezheng Xu, Zelin Maeda, Keiichi Doi, Mamoru Nomoto, Ken'ichi Yasuda, Naoki Tanaka, Masaomi Shigeyama, Toshikazu Tominaga, Nozomu Ivezić, Željko Yoachim, Peter Jha, Saurabh W. Wang, Tinggui Suzuki, Nao Furusawa, Hisanori Connolly, Andrew J. Miyazaki, Satoshi |
| contents | 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 \textbf{67} 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_15609 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Common Origin of Normal Type Ia Supernovae Suggested by the Photometric Diversity Wu, Weiyu Jiang, Ji-an Meng, Dezheng Xu, Zelin Maeda, Keiichi Doi, Mamoru Nomoto, Ken'ichi Yasuda, Naoki Tanaka, Masaomi Shigeyama, Toshikazu Tominaga, Nozomu Ivezić, Željko Yoachim, Peter Jha, Saurabh W. Wang, Tinggui Suzuki, Nao Furusawa, Hisanori Connolly, Andrew J. Miyazaki, Satoshi High Energy Astrophysical Phenomena Solar and Stellar Astrophysics 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 \textbf{67} 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. |
| title | A Common Origin of Normal Type Ia Supernovae Suggested by the Photometric Diversity |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2507.15609 |