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Observations of the Very Young Type Ia Supernova 2019np with Early-excess Emission by Sai, Hanna; Wang, Xiaofeng; Elias-Rosa, Nancy; Yang, Yi; Zhang, Jujia; Lin, Weili; Mo, Jun; Piro, Anthony L.; Zeng, Xiangyun; Andrea, Reguitti; Brown, Peter; Burns, Christopher R.; Cai, Yongzhi; Fiore, Achille; Hsiao, Eric Y.; Isern, Jordi; Itagaki, K.; Li, Wenxiong; Li, Zhitong; Pessi, Priscila J.; Phillips, M. M.; Schuldt, Stefan; Shahbandeh, Melissa; Stritzinger, Maximilian D.; Tomasella, Lina; Vogl, Christian; Wang, Bo; Wang, Lingzhi; Wu, Chengyuan; Yang, Sheng; Zhang, Jicheng; Zhang, Tianmeng; Zhang, Xinghan is a scholarly article available to read on EtoBox.

What is Observations of the Very Young Type Ia Supernova 2019np with Early-excess Emission about?

Early-time radiative signals from type Ia supernovae (SNe Ia) can provide important constraints on the explosion mechanism and the progenitor system. We present observations and analysis of SN 2019np, a nearby SN Ia discovered within 1-2 days after the explosion. Follow-up observations were conducted in optical, ultraviolet, and near-infrared bands, covering the phases from $\sim-$16.7 days to $\sim$+367.8 days relative to its $B-$band peak luminosity. The photometric and spectral evolutions of SN 2019np resembles the average behavior of normal SNe Ia. The absolute B-band peak magnitude and the post-peak decline rate are $M_{\rm max}(B)=-19.52 \pm 0.47$mag and $\Delta m_{\rm15}(B) =1.04 \pm 0.04$mag, respectively. No Hydrogen line has been detected in the near-infrared and nebular-phase spectra of SN 2019np. Assuming that the $^{56}$Ni powering the light curve is centrally located, we find that the bolometric light curve of SN 2019np shows a flux excess up to 5.0% in the early phase compared to the radiative diffusion model. Such an extra radiation perhaps suggests the presence of an additional energy source beyond the radioactive decay of central nickel. Comparing the observed col

Author

Sai, Hanna; Wang, Xiaofeng; Elias-Rosa, Nancy; Yang, Yi; Zhang, Jujia; Lin, Weili; Mo, Jun; Piro, Anthony L.; Zeng, Xiangyun; Andrea, Reguitti; Brown, Peter; Burns, Christopher R.; Cai, Yongzhi; Fiore, Achille; Hsiao, Eric Y.; Isern, Jordi; Itagaki, K.; Li, Wenxiong; Li, Zhitong; Pessi, Priscila J.; Phillips, M. M.; Schuldt, Stefan; Shahbandeh, Melissa; Stritzinger, Maximilian D.; Tomasella, Lina; Vogl, Christian; Wang, Bo; Wang, Lingzhi; Wu, Chengyuan; Yang, Sheng; Zhang, Jicheng; Zhang, Tianmeng; Zhang, Xinghan

Published

2022

Language

EN