中等光度Iax型超新星SN 2024pxl的层析成像分析
Tomography analysis of the intermediate-luminosity Type Iax SN 2024pxl
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中文总结 AI 辅助
对中等光度Iax型超新星SN 2024pxl进行丰度层析成像分析,利用TARDIS合成光谱拟合前100天光谱演化,揭示其抛射物分层结构,并论证Iax型超新星在光度上具有连续性,共享相同前身星与爆炸起源。
中文摘要 AI 辅助
我们对SN 2024pxl进行了丰度层析成像分析,这是一颗中等光度的Iax型超新星($M_{r}=-16.82 \pm 0.19$ mag),拥有迄今为止Iax型子类中最为详细的后续观测。作为少数中等光度Iax型天体之一,SN 2024pxl可能连接了这一特殊热核超新星子类的两个极端。为验证这一假设,我们分析了其爆炸后前100天的光谱演化,并旨在探测其抛射物的结构。我们使用一维辐射转移代码TARDIS产生的合成光谱进行了丰度层析成像分析。光谱时间序列的拟合提供了物理性质的径向扫描,并探测了SN抛射物大部分区域中化学元素的分层。观测到的光谱演化与最终模型拟合良好,类似于纯爆燃场景的一般预测,但需要对内层抛射物的密度函数以及最外层区域的化学轮廓进行显著修改。约束得到的物理特征,如光球速度和达到最大光度的时间,也与其他Iax型超新星一致。尽管数量稀少,中等光度Iax型超新星并非该子类中的异常值,而是展示了Iax型超新星在其光度范围内的连续性。基于这一观测,我们认为所有Iax型超新星共享相同的前身星和爆炸起源。
英文摘要
We present an abundance tomography analysis of SN 2024pxl, an intermediate luminosity Type Iax supernova ($M_{r}=-16.82 \pm 0.19$ mag), with the most-detailed follow-up in the Type Iax subclass to-date. As one of the few intermediate luminosity Type Iax objects, SN 2024pxl may link the two extremes of the peculiar thermonuclear supernova subclass. To test this hypothesis, we analyze its spectral evolution through the first 100 days after the explosion and aim to probe the structure of its ejecta. We conduct an abundance tomography analysis using synthetic spectra produced with the one dimensional radiative transfer code TARDIS. The fit of the spectral time series provides a radial scan of physical properties and probes the stratification of chemical elements throughout most of the SN ejecta. The observed spectral evolution is well fit with the final model, similar to the general predictions of the pure deflagration scenarios, but significant modifications are required in the density function of the inner ejecta and in the chemical profiles of the outermost regions. The constrained physical characteristics, such as the photospheric velocities and the time of maximum light, are also consistent with other SNe~Iax. Despite their small number, intermediate luminosity Type Iax SNe are not outliers in the subclass but demonstrate the continuous nature of SNe Iax through their luminosity range. Following this observation, we argue that all SNe~Iax share the same progenitor and explosion origin.
发表机构
- University of Szeged(塞格德大学)
- HUN-REN-SZTE Stellar Astrophysics Research Group(匈牙利研究网络-塞格德大学恒星天体物理研究组)
- Indian Institute of Astrophysics(印度天体物理研究所)
- Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA)(天体物理学跨学科探索与研究中心)
- Rutgers, the State University of New Jersey(新泽西州立罗格斯大学)
- Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Brera(意大利国家天体物理研究所,布雷拉天文台)
- Department of Astronomy, University of California, Berkeley(加州大学伯克利分校天文学系)
- European Southern Observatory(欧洲南方天文台)
- Gemini Observatory/NSF’s NOIRLab(吉米尼天文台/美国国家科学基金会NOIRLab)
- Las Cumbres Observatory(拉斯孔布伦斯天文台)
- Department of Physics, University of California, Santa Barbara(加州大学圣塔芭芭拉分校物理系)
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