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arXiv 2602.02677astro-ph.HE
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2205颗ZTF DR2型Ia超新星光变曲线建模:对Ia型超新星物理和宇宙学的启示

Lightcurve Modelling of 2,205 ZTF DR2 Type~Ia Supernovae: Implications for SN Ia Physics and Cosmology

University of Cambridge(剑桥大学);KTH Royal Institute of Technology(皇家理工学院);Stockholm University(斯德哥尔摩大学);Northwestern University(西北大学)
Nikhil Sarin, Ellen Lindsjö, Lisa Kelsey, Matthew Grayling, Jesper Sollerman, Steve Schulze, Adam Miller, Madeleine Ginolin, Erin Hayes, Conor Omand, Kaisey Man… 展开作者

Nikhil Sarin, Ellen Lindsjö, Lisa Kelsey, Matthew Grayling, Jesper Sollerman, Steve Schulze, Adam Miller, Madeleine Ginolin, Erin Hayes, Conor Omand, Kaisey Mandel, Aaron Do, Suhail Dhawan, Joel Johansson

AI总结:

本研究通过建模2205颗Ia型超新星光变曲线,揭示了宿主质量对抛射物质量及镍产量的影响,为Ia型超新星标准化提供了物理基础,并量化了其多样性及环境依赖性。

摘要:

我们利用Zwicky瞬态设施DR2中2205颗Ia型超新星(SNe Ia)的多波段光变曲线,采用一个单区放射性衰变模型,并加入现象学因素以包括铁重新结合物理。我们发现推断出的镍质量与SALT2伸展之间存在强相关性,这在我们简化建模中与更大的抛射物质量提供更长的扩散时间有关,为更亮更慢的关系提供了物理基础。低质量宿主(log10(M*/M⊙)<10)的Ia型超新星产生比高质量宿主多12%的56Ni(ΔM_Ni=0.13M⊙),将宿主星系质量阶梯与抛射物特性联系起来,并暗示金属licity或年龄依赖的燃烧效率。这表明基于物理参数的标准化可能消除质量阶梯。类似SN1991T的事件显示出更高的抛射物质量(中位数1.64M⊙ vs. 1.38M⊙ for正常值)并产生30%更多的56Ni,其中84%具有超钱德拉塞克har质量。通过对902颗SNe(z≤0.06)的分层建模,我们发现热核超新星可以用抛射物质量和镍质量的高斯分布很好地描述,分别有μ_ej=1.26±0.01M⊙(σ_ej=0.33±0.01M⊙)和μ_Ni=0.64±0.06M⊙(σ_Ni=0.42±0.02M⊙)。这导致推断出的子M_Ch事件比例为43±2%(<1.2M⊙),近M_Ch事件比例为34±1%(1.2-1.5M⊙),超M_Ch事件比例为24±2%(>1.5M⊙)。这项工作为本地Ia型超新星群体的全面物理表征提供了步骤,强化了Ia型超新星标准化的物理基础,同时量化了多样性及环境依赖性,这对于理解前身物理和减轻精确宇宙学中的系统误差至关重要。

英文摘要:

We fit the multi-band light curves of 2,205 Type Ia supernovae (SNe~Ia) from the Zwicky Transient Facility DR2 with a one-zone radioactive decay model with a phenomenological addition to include Fe recombination physics. We find a strong correlation between inferred nickel mass and SALT2 stretch, which our simplified modelling links to longer diffusion times in more massive ejecta, offering a physical basis for the brighter-slower relation. SNe~Ia in low-mass hosts ($\log_{10}(M_*/M_\odot) < 10$) produce $\approx 12\%$ more $^{56}$Ni than those in high-mass hosts, linking the host-galaxy mass step to ejecta properties and hinting at metallicity or age-dependent burning efficiencies. A pseudo-bolometric comparison provides lower limits on the nickel masses, highlighting their sensitivity to SED-level assumptions. Injection-and-recovery tests with realistic ZTF sampling and the same model recover the nickel scale but show significant sensitivity to distance and opacity assumptions; individual-event point estimates are therefore model-dependent. Accounting for selection biases and broad individual-event posteriors, hierarchical modelling of 902 SNe ($z \leq 0.06$) gives Gaussian population distributions with $μ_{\rm ej} = 1.26 \pm 0.01~M_\odot$ ($σ_{\rm ej} = 0.33 \pm 0.01~M_\odot$) and $μ_{\rm Ni} = 0.64 \pm 0.06~M_\odot$ ($σ_{\rm Ni} = 0.42 \pm 0.02~M_\odot$). This work provides a step towards physical characterization of the local SN~Ia population while quantifying diversity and environmental dependencies relevant to progenitor physics and precision cosmology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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