SN 2009N: Linking normal and subluminous type II-P SNe
K. Takáts, M. L. Pumo, N. Elias-Rosa, A. Pastorello, G. Pignata, E. Paillas, L. Zampieri, J. P. Anderson, J. Vinkó, S. Benetti, M-T. Botticella, F. Bufano, A. C… 展开作者
K. Takáts, M. L. Pumo, N. Elias-Rosa, A. Pastorello, G. Pignata, E. Paillas, L. Zampieri, J. P. Anderson, J. Vinkó, S. Benetti, M-T. Botticella, F. Bufano, A. Campillay, R. Cartier, M. Ergon, G. Folatelli, R. J. Foley, F. Förster, M. Hamuy, V-P. Hentunen, E. Kankare, G. Leloudas, N. Morrell, M. Nissinen, M. M. Phillips, S. J. Smartt, M. Stritzinger, S. Taubenberger, S. Valenti, S. D. Van Dyk, J. B. Haislip, A. P. LaCluyze, J. P. Moore, D. Reichart
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23 pages, 18 figures, accepted for publication by MNRAS
We present ultraviolet, optical, near-infrared photometry and spectroscopy of SN 2009N in NGC 4487. This object is a type II-P supernova with spectra resembling those of subluminous II-P supernovae, while its bolometric luminosity is similar to that of the intermediate luminosity SN 2008in. We created SYNOW models of the plateau phase spectra for line identification and to measure the expansion velocity. In the near-infrared spectra we find signs indicating possible weak interaction between the supernova ejecta and the pre-existing circumstellar material. These signs are also present in the previously unpublished near-infrared spectra of SN 2008in. The distance to SN 2009N is determined via the expanding photosphere method and the standard candle method as $D= 21.6 \pm 1.1\,{\mathrm {Mpc}}$. The produced nickel-mass is estimated to be $\sim 0.020 \pm 0.004\,{\mathrm M_\odot}$. We infer the physical properties of the progenitor at the explosion through hydrodynamical modelling of the observables. We find the values of the total energy as $\sim 0.48 \times 10^{51}\, {\mathrm {erg}}$, the ejected mass as $\sim 11.5\,{\mathrm M_\odot}$, and the initial radius as $\sim 287\,{\mathrm R_\odot}$.
Line Polarization of Si II $λ$6355 Å in Type Ia Supernovae: A New Statistical Approach to Probe the Explosion Physics and Diversity
Gemini Observatory / NSF's NOIRLab(双子座天文台 / 美国国家光学红外天文研究实验室);Florida State University(佛罗里达州立大学);European Organisation for Astronomical Research in the Southern Hemisphere (ESO)(欧洲南方天文学组织);University of Texas, Austin(德克萨斯大学奥斯汀分校);Tsinghua University(清华大学)
通过分析Ia型超新星中Si II λ6355 Å线的偏振特性,研究者利用统计方法揭示了爆炸物理和多样性,发现不同非对称性类别对偏振的影响。
Subluminous Type IIP SN 2024abfl as a Result of a Significantly Low-energy Fe-core Collapse
Tsung-Dao Lee Institute, Shanghai Jiao Tong University(李政道研究所,上海交通大学);Indian Institute of Astrophysics(印度天体物理研究所);Oskar Klein Centre, Department of Astronomy, Stockholm University(奥斯卡·克莱因中心,斯德哥尔摩大学天文学系);Pondicherry University(本地治里大学);Academy of Scientific and Innovative Research (AcSIR)(科学与创新研究学院)
本文通过多波段测光和低分辨率光谱观测,研究了极低光度 IIP 型超新星 SN 2024abfl,发现其具有极平坦的光变平台和低膨胀速度,通过一维流体动力学模型得出其前身星质量上限为 10 太阳质量,爆发能量极低(≤0.05 foe),镍质量仅 0.003 太阳质量,为低能核坍缩爆炸提供了重要约束。
Linear spectropolarimetry of 35 Type Ia Supernovae with VLT/FORS: An analysis of the Si II line polarization
光谱偏振使我们能够测量超新星爆炸中喷出物的几何形状和化学结构,这对于理解其爆炸机制和祖先系统至关重要。我们收集了35个Ia型超新星(SNe Ia)的档案数据,用甚大望远镜上的FORS观测,共127个历元。我们研究了Si II $λ$ 6355 $Å$线(p $_{\rm Si II}$)的偏振作为时间的函数,可以看出其在相对于最大亮度的各种偏振度和时期的范围内达到峰值。我们再现了在以前的研究中确定的$Δ$ m $_{15}$ -p $_{\rm Si II}$关系,并表明亚发光和过渡物体显示的偏振值低于正常Ia型超新星的$Δ$ m $_{15}$ -p $_{\rm Si II}$关系。我们发现了一个统计上显着的线性关系的Si II $λ$ 6355 $Å$线的偏振之前的最大亮度和Si II线速度,并建议这一点,随着$Δ$ m $_{15}$ -P $_{\rm Si II}$的关系,可以解释的延迟爆炸模型的上下文中。相比之下,我们比较了我们的观察$Δ$ m $_{15}$ -v $_{\rm Si II}$平面中的数值预测,并发现了一个二分法之间的极化性质的Bracrasekhar和sub-Bracrasekhar质量爆炸,这支持了两种不同的爆炸机制的可能性。SNe的子样本显示在$q$ - $u$平面中的环的演化,这表明具有深度的更复杂的Si结构。这种见解,这不能收集到的总通量谱…
The 91T/99aa-like Type Ia Supernova 2019vrq, Part I: Photometry, Spectroscopy, and Spectropolarimetry of a Nearly Standard Candle
Tsinghua University(清华大学);Florida State University(佛罗里达州立大学);University of Texas(德克萨斯大学);European Organisation for Astronomical Research in the Southern Hemisphere (ESO)(欧洲南方天文台);Texas A&M University(德克萨斯农工大学);Las Cumbres Observatory(拉西布朗观测站);University of California, Santa Barbara(加州大学圣塔芭芭拉分校);University of California, Berkeley(加州大学伯克利分校)
WFST Supernovae in the First Year: II. SN 2024aedt: Systematical Study of a Transitional Type Ia Supernova
University of Science and Technology of China(中国科学技术大学);National Astronomical Observatory of Japan(日本国立天文台);Institute of Deep Space Sciences, Deep Space Exploration Laboratory(深空探测实验室深空科学研究所);Kyoto University(京都大学)