The Cow: discovery of a luminous, hot and rapidly evolving transient
S. J. Prentice, K. Maguire, S. J. Smartt, M. R. Magee, P. Schady, S. Sim, T. -W. Chen, P. Clark, C. Colin, M. Fulton, O. McBrien, D. O`Neill, K. W. Smith, C. As… 展开作者
S. J. Prentice, K. Maguire, S. J. Smartt, M. R. Magee, P. Schady, S. Sim, T. -W. Chen, P. Clark, C. Colin, M. Fulton, O. McBrien, D. O`Neill, K. W. Smith, C. Ashall, K. C. Chambers, L. Denneau, H. A. Flewelling, A. Heinze, T. W. -S. Holoien, M. E. Huber, C. S. Kochanek, P. A. Mazzali, J. L. Prieto, A. Rest, B. J. Shappee, B. Stalder, K. Z. Stanek, M. D. Stritzinger, T. A. Thompson, J. L. Tonry
备注：
Accepted for publication in ApJL, updated to reflect the published version
We present the ATLAS discovery and initial analysis of the first 18 days of the unusual transient event, ATLAS18qqn/AT2018cow. It is characterized by a high peak luminosity ($\sim$1.7 $\times$ 10$^{44}$ erg s$^{-1}$), rapidly evolving light curves ($>$5 mag rise to peak in $\sim$3.5 days), and hot blackbody spectra, peaking at $\sim$27000 K that are relatively featureless and unchanging over the first two weeks. The bolometric light curve cannot be powered by radioactive decay under realistic assumptions. The detection of high-energy emission may suggest a central engine as the powering source. Using a magnetar model, we estimated an ejected mass of $0.1-0.4$ \msol, which lies between that of low-energy core-collapse events and the kilonova, AT2017gfo. The spectra cooled rapidly from 27000 to 15000 K in just over 2 weeks but remained smooth and featureless. Broad and shallow emission lines appear after about 20 days, and we tentatively identify them as He I although they would be redshifted from their rest wavelengths. We rule out that there are any features in the spectra due to intermediate mass elements up to and including the Fe-group. The presence of r-process elements cannot be ruled out. If these lines are due to He, then we suggest a low-mass star with residual He as a potential progenitor. Alternatively, models of magnetars formed in neutron-star mergers give plausible matches to the data.
AT 2024wpp: the most luminous fast-evolving optical transient linked to the merger explosion of a black-hole binary
University of Science and Technology of China（中国科学技术大学）；Instituto de Astrofisica de Canarias（加那利天体物理学研究所）；Universidad de La Laguna（拉古纳大学）；Xiamen University（厦门大学）；INAF – Osservatorio Astronomico di Padova（意大利国家天文台帕多瓦天文台）；Institute of Space Sciences (ICE, CSIC)（空间科学研究所（西班牙高等科学研究委员会））；Tsinghua University（清华大学）；Nanchang University（南昌大学）；Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）
AT 2024wpp是首个被证实与黑洞双星并合爆炸相关的最明亮快速演化光学瞬变体，其X射线和光学亮度特征支持潮汐破坏事件理论。
SN 2021lwz: Another Exotic Luminous and Fast Evolving Optical Stripped Envelope Supernova ?
Instituto de Astrofísica de Canarias（加那利天体物理学研究所）；Universidad de La Laguna（拉古纳大学）；Konkoly Observatory, CSFK（孔科利天文台，匈牙利科学院研究网络）；Department of Optics & Quantum Electronics, University of Szeged（塞格德大学光学与量子电子学系）；ELTE Eötvös Loránd University, Gothard Astrophysical Observatory（厄特沃什·洛兰大学戈塔德天体物理观测站）；Graduate Institute of Astronomy, National Central University（国立中央大学天文学研究所）；GRANTECAN（格兰特卡南望远镜）；The Oskar Klein Centre, Department of Astronomy, Stockholm University（斯德哥尔摩大学奥斯特云中心天文学系）；Institute of Astronomy, University of Cambridge（剑桥大学天文学研究所）；Department of Astronomy, University of California, Berkeley（加州大学伯克利分校天文学系）
VLASS Discovery of a Luminous Galactic Radio Transient Evolving on Decade Timescales
California Institute of Technology（加州理工学院）；National Radio Astronomy Observatory（美国国家射电天文台）；Center for Astrophysics – Harvard & Smithsonian（哈佛-史密森尼天体物理中心）；University of California, Berkeley（加州大学伯克利分校）；University of California Santa Cruz（加州大学圣克鲁兹分校）；University of Toronto（多伦多大学）
ASKAP J005512.2-255834: A Luminous, Long-Lived Radio Transient at z = 0.1 -- an Orphan Afterglow or an off-nuclear TDE from an IMBH?
Sydney Institute for Astronomy, School of Physics, The University of Sydney（悉尼大学物理学院天体物理学研究所）；ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)（引力波发现卓越研究中心）；Australia Telescope National Facility, CSIRO, Space and Astronomy（CSIRO空间与天文国家望远镜设施）；Department of Physics, University of Wisconsin-Milwaukee（威斯康星大学密尔沃基分校物理系）
Spoon-Feeding Giant Stars to Supermassive Black Holes: Episodic Mass Transfer from Evolving Stars and Their Contribution to the Quiescent Activity of Galactic Nuclei
Radio observations of the tidal disruption event AT2020opy: a luminous non-relativistic outflow encountering a dense circumnuclear medium
潮汐破裂事件（TDEs）发生在恒星过于接近超大质量黑洞并被潮汐引力摧毁时。TDEs的无线电观测跟踪同步辐射流出的材料，可能是从吸积流的内部区域周围的SMBH或潮汐碎屑流喷出。潮汐破裂事件的无线电探测是罕见的，但提供了关于超大质量黑洞的喷流和流出物的发射以及星系中的环核环境的关键信息。本文介绍了TDE AT 2020opy的射电探测，包括用Karl G. Jansky的甚大天线阵（VLA），MeerKAT和升级的巨型米波射电望远镜。AT2020opy是迄今为止报道的最远的热TDE与无线电发射，从建模的同步辐射光谱，我们推断，主机星系有一个更密集的环核介质比其他热TDE在无线电波段检测。基于事件的同步加速器光谱特性的均分分析，我们得出结论，无线电发射流出可能是大约在最初的光学耀斑发生时或之后发射的。我们没有发现外流的相对论运动的证据。这一事件的高光度支持了宿主星系的致密环核介质产生更明亮的无线电发射，其上升到峰值的速度比中心密度较低的星系更快。
Fast Luminous Extragalactic Transients in the VLA Sky Survey: Implications for the rates of Accretion-Induced Collapse Events, Fast Blue Optical Transients and Gamma Ray Burst Afterglows
AT2021yky: A Fast-Rising Optical Transient with Evolving Broad Hydrogen Emission Consistent with an Ambiguous Nuclear Transient
The Ohio State University（俄亥俄州立大学）；University of Illinois Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校）；Institute for Astronomy, University of Hawai‘i at Manoa（夏威夷大学马诺阿分校天体物理研究所）；University of Michigan（密歇根大学）；The University of Melbourne（墨尔本大学）；University of California, Santa Cruz（加州大学圣克鲁兹分校）；University of Cambridge（剑桥大学）；Space Telescope Science Institute（太空望远镜科学研究所）
Core-collapse supernovae 2022prr, 2023ucy, and 2024ljc in the luminous infrared galaxy NGC 6745
University of Turku（图尔库大学）；Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所）；European University Cyprus（塞浦路斯欧洲大学）；Queen’s University Belfast（贝尔法斯特女王大学）；INAF – Osservatorio Astronomico di Padova（意大利国家天体物理研究所帕多瓦天文台）；INAF – Osservatorio Astronomico di Brera（意大利国家天体物理研究所布雷拉天文台）；Yunnan Observatories, Chinese Academy of Sciences (CAS)（中国科学院云南天文台）
SN 2024aecx: a fast-evolving Type IIb supernova with a prominent shock-cooling peak
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）；Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University（北京师范大学前沿天文与天体物理研究所）；Aryabhatta Research Institute of Observational Sciences（阿亚巴塔观测科学研究所）；Mahatma Jyotiba Phule Rohilkhand University（马哈特马·乔蒂巴·普尔·罗希尔坎德大学）；Department of Physics, Royal Holloway, University of London（伦敦大学皇家霍洛威学院物理系）；National Astronomical Research Institute of Thailand（泰国国家天文研究所）；Institute of Astrophysics, Central China Normal University（华中师范大学天体物理研究所）；Education Research and Application Center, National Astronomical Data Center（国家天文数据中心教育研究与应用中心）；Key Laboratory of Quark and Lepton Physics (Central China Normal University), Ministry of Education（教育部夸克与轻子物理重点实验室（华中师范大学））；Millennium Institute of Astrophysics（天体物理千年研究所）；Department of Physics, Indian Institute of Technology Roorkee（印度理工学院卢尔基分校物理系）；Department of Physics, University of Warwick（华威大学物理系）；Department of Applied Optics and Photonics, University of Calcutta（加尔各答大学应用光学与光子学系）；Chinese Academy of Sciences South America Center for Astronomy (CASSACA), National Astronomical Observatories, CAS（中国科学院南美天文中心（CASSACA），中国科学院国家天文台）；Centre for Astrophysics Research, University of Hertfordshire（赫特福德大学天体物理学研究中心）
SN 2024aecx是一颗快速演化型IIb超新星，通过高频率观测揭示其冲击冷却峰值和双星前身系统特征。
