AT 2017gbl: a dust obscured TDE candidate in a luminous infrared galaxy
E. C. Kool, T. M. Reynolds, S. Mattila, E. Kankare, M. A. Perez-Torres, A. Efstathiou, S. Ryder, C. Romero-Canizales, W. Lu, T. Heikkila, G. E. Anderson, M. Ber… 展开作者
E. C. Kool, T. M. Reynolds, S. Mattila, E. Kankare, M. A. Perez-Torres, A. Efstathiou, S. Ryder, C. Romero-Canizales, W. Lu, T. Heikkila, G. E. Anderson, M. Berton, J. Bright, G. Cannizzaro, D. Eappachen, M. Fraser, M. Gromadzki, P. G. Jonker, H. Kuncarayakti, P. Lundqvist, K. Maeda, R. M. McDermid, A. M. Medling, S. Moran, A. Reguitti, M. Shahbandeh, S. Tsygankov, V. U, T. Wevers
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Accepted for publication by MNRAS. 32 pages, 22 figures
We present the discovery with Keck of the extremely infrared (IR) luminous transient AT 2017gbl, coincident with the Northern nucleus of the luminous infrared galaxy (LIRG) IRAS 23436+5257. Our extensive multi-wavelength follow-up spans ~900 days, including photometry and spectroscopy in the optical and IR, and (very long baseline interferometry) radio and X-ray observations. Radiative transfer modelling of the host galaxy spectral energy distribution and long-term pre-outburst variability in the mid-IR indicate the presence of a hitherto undetected dust obscured active galactic nucleus (AGN). The optical and near-IR spectra show broad 2000 km/s hydrogen, He I and O I emission features that decrease in flux over time. Radio imaging shows a fast evolving compact source of synchrotron emission spatially coincident with AT 2017gbl. We infer a lower limit for the radiated energy of 7.3 x 10^50 erg from the IR photometry. An extremely energetic supernova would satisfy this budget, but is ruled out by the radio counterpart evolution. Instead, we propose AT 2017gbl is related to an accretion event by the central supermassive black hole, where the spectral signatures originate in the AGN broad line region and the IR photometry is consistent with re-radiation by polar dust. Given the fast evolution of AT 2017gbl, we deem a tidal disruption event (TDE) of a star a more plausible scenario than a dramatic change in the AGN accretion rate. This makes AT 2017gbl the third TDE candidate to be hosted by a LIRG, in contrast to the so far considered TDE population discovered at optical wavelengths and hosted preferably by post-starburst galaxies.
AT2019aalc: An obscured tidal disruption event candidate in an active galactic nucleus revealed by its first flare?
College of Physics and Electronic Engineering, Northwest Normal University（西北师范大学物理与电子工程学院）；School of Physical Science and Technology, Guangxi University（广西大学物理科学与技术学院）
High-energy neutrinos from shocked circumnuclear material around optically-bright and infrared-only tidal disruption events
Fermi National Accelerator Laboratory（费米国家加速器实验室）；University of Chicago（芝加哥大学）；NSF-Simons AI Institute for the Sky (SkAI)（NSF-西蒙斯天空人工智能研究所）；Tohoku University（东北大学）；The University of Tokyo（东京大学）
Radio and X-ray flux rebrightening six years after outburst in a partially-obscured extreme changing-look AGN
Anhui Normal University（安徽师范大学）；University of Science and Technology of China（中国科学技术大学）；Nanjing Normal University（南京师范大学）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）
Revealing a multi-zone circumnuclear dust response in UGC 11487 through phase-resolved WISE W1--W2 diagnostics
Main Astronomical Observatory of the NAS of Ukraine（乌克兰国家科学院主天文台）；International Centre for Astronomical, Medical and Ecological Research（国际天文、医学与生态研究中心）
Optical/infrared observations of the extraordinary GRB 250702B: a highly obscured afterglow in a massive galaxy consistent with multiple possible progenitors
University of North Carolina at Chapel Hill（北卡罗来纳大学教堂山分校）；Carnegie Mellon University（卡内基梅隆大学）；University of Manchester（曼彻斯特大学）；Ludwig-Maximilians-Universität München（慕尼黑大学）；The Open University of Israel（以色列开放大学）；The George Washington University（乔治华盛顿大学）；Syracuse University（雪城大学）；Northwestern University（西北大学）；California Institute of Technology（加州理工学院）；Zhejiang University（浙江大学）；Cerro Tololo Inter-American Observatory/NSF NOIRLab（塞罗托洛泛美天文台/美国国家科学基金会NOIRLab）；Weizmann Institute of Science（魏茨曼科学研究所）；Gemini Observatory/NSF's NOIRLab（吉米天文台/美国国家科学基金会NOIRLab）
本文通过多台望远镜的光学/红外观测研究最长伽马射线暴 GRB 250702B，发现其高度遮蔽的余辉来自相对论性喷流，宿主为正在并合的大质量富尘星系，并指出多种 progenitor 情景均可解释观测结果。
AT 2022csn: A Photometrically Peculiar Optical/UV Tidal Disruption Event in a Type II AGN
Tel Aviv University（特拉维夫大学）；University of Texas at Austin（德克萨斯大学奥斯汀分校）；University of Florida（佛罗里达大学）；Stanford University（斯坦福大学）；Kavli Institute for Particle Astrophysics & Cosmology, Stanford University（斯坦福大学卡弗里粒子天体物理与宇宙学研究所）；Center for Decoding the Universe, Stanford University（斯坦福大学解码宇宙中心）；NASA Goddard Space Flight Center（美国国家航空航天局戈达德太空飞行中心）
本研究报道了II型AGN中一颗测光特殊的光学/紫外TDE AT 2022csn，其为遥远且明亮的TDE，或属于低温高半径TDE新子群，提出TDE与AGN吸积盘相互作用等场景解释其特性。
Extreme AGN Variability in WISE: Powerful Flares and Candidate Tidal Disruption Events in AGN
University of Missouri – Kansas City（密苏里大学堪萨斯城分校）；Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）；Columbia University（哥伦比亚大学）；Flatiron Institute（平顿研究所）；Massachusetts Institute of Technology（麻省理工学院）；California Institute of Technology（加州理工学院）；American Museum of Natural History（美国自然历史博物馆）；CUNY Borough of Manhattan Community College（纽约市立学院曼哈顿社区学院）；CUNY Graduate Center（纽约市立大学研究生中心）
ATLAS22kjn (AT 2022fpx): A Coronal Line Emitter with an Early Light Curve Bump and Mid-Infrared Dust Echo
University of Illinois（伊利诺伊大学）；Institute for Astronomy, University of Hawai‘i（夏威夷大学天文研究所）；School of Physics, University of Melbourne（墨尔本大学物理学院）；The Ohio State University（俄亥俄州立大学）；Texas Tech University（德克萨斯理工大学）；Peking University（北京大学）；National Astronomical Observatories, Chinese Academy of Science（中国科学院国家天文台）
