We present spectroscopic observations of GRB091127 (z=0.490) at the peak of the putative associated supernova, SN2009nz. Subtracting a late-time spectrum of the host galaxy, we isolate the contribution of SN2009nz and uncover broad features typical of nearby GRB-SNe. This establishes unambiguously that GRB091127 was accompanied by a broad-lined Type Ic SN, and links a cosmological long burst with a standard energy release (E_gamma,iso ~ 1.1e52 erg) to a massive star progenitor. The spectrum of SN2009nz closely resembles that of SN2006aj, with SN2003dh also providing an acceptable match, but has significantly narrower features than SNe 1998bw and 2010bh, indicative of a lower expansion velocity. The photospheric velocity inferred from the SiII 6355 absorption feature, v_ph ~ 17,000 km/s, is indeed closer to that of SNe 2006aj and 2003dh than to the other GRB-SNe. Combining the measured velocity with the light curve peak brightness and width, we estimate the following explosion parameters: M_Ni ~ 0.35 M_sun, E_K ~ 2.3e51 erg, and M_ej ~ 1.4 M_sun, similar to those of SN2006aj. These properties indicate that SN2009nz follows a trend of lower M_Ni for GRB-SNe with lower E_K and M_ej. Equally important, since GRB091127 is a typical cosmological burst, the similarity of SN2009nz to SN2006aj either casts doubt on the claim that XRF060218/SN2006aj was powered by a neutron star, or indicates that the nature of the central engine is encoded in the SN properties but not in the prompt emission. Future spectra of GRB-SNe at z > 0.3, including proper subtraction of the host galaxy contribution, will shed light on the full dispersion of SN properties for standard long GRBs, on the relation between SNe associated with sub-energetic and standard GRBs, and on a potential dispersion in the associated SN types.
SN 2017hcc and SN 2023usc a comparative spectroscopic study of type IIn supernovae
Indian Institute of Astrophysics(印度天体物理研究所);Instituto de Estudios Astrofísicos, Universidad Diego Portales(迭戈帕拉莱斯大学天体物理研究学院);Millennium Institute of Astrophysics(天体物理千年研究所);Department of Physics, Florida State University(佛罗里达州立大学物理系);Homi Bhabha Center for Science Education Tata Institute of Fundamental Research(塔塔基础科学教育霍米巴巴中心)
A Young Supernova Selection Pipeline For The LSST Era
University of Surrey(萨里大学);University of Portsmouth(朴茨茅斯大学);Trinity College Dublin, The University of Dublin(都柏林三一学院,都柏林大学);Lancaster University(兰卡斯特大学);University of Oxford(牛津大学);Queen’s University Belfast(贝尔法斯特女王大学)
Classification of the core-collapse supernova explosion mechanism with learned dictionaries
核心坍缩超新星(CCSN)是引力波的主要来源。对它们典型频率的估计使它们成为目前先进的地面探测器网络的完美目标。成功的探测可能通过波形分析揭示潜在的爆炸机制。这一点已经用超新星模型证据提取器(SMEE; Logue et al.(2012))进行了说明,这是一种基于主成分分析和贝叶斯模型选择的算法。在这里,我们提出了一个补充的方法,SMEE的基础上(监督)字典学习,并表明它是能够重建和分类CCSN信号根据其形态。我们的波形信号是从(a)两个公开可用的目录建立从中微子驱动(Mur)和磁旋转(Dim)CCSN爆炸的数值模拟和(b)从第三个模拟正弦高斯(SG)波形的“模拟”目录。这些信号被注入有色高斯噪声中,以模拟先进LIGO宽带配置中的背景噪声,并缩放到可自由指定的信噪比(SNR)。我们表明,我们的方法正确地分类信号从所有三个字典。特别是,对于SNR=15-20,我们获得了Dim和SG信号的完美匹配以及Mur信号的约85%的真实分类。这些结果与SMEE报告的相同CCSN信号仅注入一个LIGO探测器时的结果相当。我们讨论了我们的方法的主要局限性以及可能的改进。
SN 2024abfl: A Flat-Plateau, Low-Luminosity Type IIP Supernova with Early CSM Interaction
Maria Mitchell Association(玛丽亚·米切尔协会);The University of Texas at Austin(德克萨斯大学奥斯汀分校);Gemini Observatory/NSF’s NOIRLab(吉米尼天文台/美国国家科学基金会NOIRLab);Space Science Institute(空间科学研究院);Louisiana State University(路易斯安那州立大学);Steward Observatory, University of Arizona(亚利桑那大学斯图尔德天文台);LSSTC Catalyst Fellow(LSSTC催化剂研究员);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);University of California, Davis(加州大学戴维斯分校)
SN 2024abfl是一种低光度IIP型超新星,其低膨胀速度和早期喷流物质相互作用提供了关于前身体和喷流物质的新见解。
Diversity of Type Ia supernova optical light curves among different spectroscopic subclasses
Institute of Astronomy, Graduate School of Science, The University of Tokyo(东京大学理学研究科天文学研究所);National Astronomical Observatory of Japan(日本国立天文台);Department of Astronomy, Kyoto University(京都大学天文学系);Astronomical Institute, Graduate School of Science, Tohoku University(东北大学理学研究科天文学研究所);Division for the Establishment of Frontier Sciences, Organization for Advanced Studies, Tohoku University(东北大学先进研究机构前沿科学部);Executive Management Program, The University of Tokyo(东京大学经营管理项目)
Progenitors and Explosion Properties of Supernova Remnants Hosting Central Compact Objects: I. RCW 103 Associated with the Peculiar Source 1E 161348-5055
The Type I Superluminous Supernova Catalogue II: Spectroscopic Evolution in the Photospheric Phase, Velocity Measurements, and Constraints on Diversity
Optical spectroscopic observations of blazars and gamma-ray blazar candidates in the Sloan Digital Sky Survey Data Release Nine
我们提出了一个分析的光谱可在斯隆数字巡天数据发布9(SDSS DR 9)的耀变体中列出的ROMA-BZCAT和γ射线耀变体候选人根据其红外颜色选择。首先,我们采用基于蒙特卡罗模拟的统计方法来寻找ROMA-BZCAT目录中列出的耀变体的光学对应物。然后,我们将SDSS光谱目录与我们选择的耀变体和伽马射线耀变体候选者的样本进行交叉匹配,寻找那些具有光谱的样本,以分类我们的耀变体源,并尽可能确认它们的红移。我们的主要目标是确定ROMA-BZCAT中列出的不确定耀变体的分类和发现新的γ射线耀变体。对于ROMA-BZCAT源,我们调查了84个耀变体的样本,确认了其中20个耀变体的分类,并获得了18个新的红移估计。对于γ射线耀变体,作为未关联的费米源的潜在对应物或具有不确定的性质,我们建立了8个耀变体的性质,分析了27个源,并确认了14个分类。
SN 2025qe: A case study of diversity in low-luminosity thermonuclear explosions
Indian Institute of Astrophysics(印度天体物理研究所);Pondicherry University(本地治里大学);National Central University(中央大学);Sardar Vallabhbhai National Institute of Technology(萨达尔·瓦拉巴伊国立理工学院);Indian Institute of Technology Bombay(孟买印度理工学院)
SN 2022ngb: A faint, slowly evolving Type IIb supernova with a low-mass envelope
Yunnan Key Laboratory of Survey Science, Yunnan University(云南省测绘科学重点实验室,云南大学);INAF - Osservatorio Astronomico di Padova(意大利国家天体物理研究所帕多瓦天文台);Yunnan Observatories, Chinese Academy of Sciences (CAS)(中国科学院云南天文台);International Centre of Supernovae, Yunnan Key Laboratory(超新星国际研究中心,云南省重点实验室);Institute of Space Sciences (ICE, CSIC)(空间科学研究所(ICE,CSIC));INAF - Osservatorio Astronomico di Brera(意大利国家天体物理研究所布雷拉天文台);School of Astronomy and Space Science, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台)
SN 2022ngb是一颗低光度IIb型超新星,其前身星为中等质量、相对紧凑的剥离包层恒星,爆炸参数包括喷流质量、能量和放射性物质分布。
Progenitors and Explosion Properties of Supernova Remnants Hosting Central Compact Objects: II. A Global Systematic Study with a Comparison to Nucleosynthesis Models
Light-Curve and Spectral Properties of Type II Supernovae from the ATLAS survey
Universidad Nacional de La Plata(拉普拉塔国立大学);Instituto de Astrofísica de La Plata (IALP), CCT-CONICET-UNLP(拉普拉塔天体物理研究所 (IALP)、CCT-CONICET-UNLP);European Southern Observatory(欧洲南方天文台);Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo(东京大学基础物理学与数学宇宙 Kavli 研究所 (WPI));Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências, Universidade de Lisboa(里斯本大学科学学院空间天体物理研究所);Institut d’Estudis Espacials de Catalunya (IEEC)(加泰罗尼亚太空研究研究所 (IEEC));Institute of Space Sciences (ICE, CSIC)(空间科学研究所 (ICE, CSIC));Stockholm University(斯德哥尔摩大学)
The Oxygen Features in Type Ia Supernovae and the Implications for the Nature of Thermonuclear Explosions
O I 7773吸收特征是Ia型超新星(SNe~Ia)的一个重要光谱指标,可用于追踪爆炸中的白矮星外层未燃烧物质。在这项工作中,我们使用大样本的SNe~Ia来检查这种吸收在早期阶段(即,-13天<t <-7天),并与Si~ Ⅱ 6355和Ca~ Ⅱ近红外三重态的吸收特征进行了比较。我们表明,对于一个子群的光谱正常SNe正常光球速度(即,vsi <12,500 km s^{-1}),O~I的高速特征线强度与Si~II(或Ca~II)的高速特征线强度呈负相关,并且与Ia超新星的光度也呈负相关。这一发现以及我们在O~ IHVF中发现的其他特征表明,对于这一SNe~Ia亚群,爆炸性氧燃烧发生在超新星的最外层,燃烧的差异可能导致观测到的多样性,这与流行的延迟爆轰模型的Ekrasekhar质量WD非常一致。
How Low Can We Go? Minimum Spectroscopic Requirements For Supernova Subtype Classification
University of Delaware(特拉华大学);Vera C. Rubin Observatory(维拉·C·鲁宾天文台);University of Virginia(弗吉尼亚大学);NSF NOIRLab(美国国家科学基金会NOIRLab);West Chester University of Pennsylvania(宾夕法尼亚州韦斯特切斯特大学)
Using LSST late-time photometry to constrain Type Ibc supernovae and their progenitors
在它的生命周期中,Vera C. Rubin Observatory Legacy Survey of Space and Time(LSST)将监测数百万颗超新星(SNe)从爆炸到被遗忘的过程,从而获得关于其后期演化的前所未有的丑陋光度数据集。在这里,我们表明,Ibc型SNe的光度演化可以用来限制其喷出物的许多属性,而不需要昂贵的光谱观测。使用辐射传输模拟不同初始质量的氦星祖先的爆炸,我们表明,g-波段过滤器主要遵循的Fe II发射的强度,r-波段[OI]6300- 6364 A和[NII]6548- 6583 A,i-波段[CaII]7291,7323 A,和z-波段的CaII NIR三重态,因此提供了核合成产量的信息。缺乏关于较弱的线的信息,例如,可以用来限制结块。然而,通过与物理上一致的3D爆炸模型建立更紧密的联系,并通过合理选择一组小得多的光谱观测,提高辐射传输模拟的物理真实性,这一缺陷最终可能会得到解决。SN辐射固有的简并性将影响光度测量的解释,但来自星云相位光谱的线通量也同样受到影响。重要的是,我们的Ibc型SN模型“家族”在颜色-颜色星等图中遵循一个独特的轨迹,因为喷出物从100到450 d演化,允许人们解开不同的祖先或爆炸。这种光度测量方法提供了一种很有前途的方法来研究SNe Ibc的统计样本,并将其与不断改进的祖先和爆炸模型相对抗,以捕获与拱星材料的后期相互作用…