A Caltech Library Service

Investigating the Nature of the Luminous Ambiguous Nuclear Transient ASASSN-17jz

Holoien, Thomas W.-S. and Neustadt, Jack M. M. and Vallely, Patrick J. and Auchettl, Katie and Hinkle, Jason T. and Romero-Cañizales, Cristina and Shappee, Benjamin. J. and Kochanek, Christopher S. and Stanek, K. Z. and Chen, Ping and Dong, Subo and Prieto, Jose L. and Thompson, Todd A. and Brink, Thomas G. and Filippenko, Alexei V. and Zheng, WeiKang and Bersier, David and Bose, Subhash and Burgasser, Adam J. and Channa, Sanyum and de Jaeger, Thomas and Hestenes, Julia and Im, Myungshin and Jeffers, Benjamin and Jun, Hyunsung D. and Lansbury, George and Post, Richard S. and Ross, Timothy W. and Stern, Daniel and Tang, Kevin and Tucker, Michael A. and Valenti, Stefano and Yunus, Sameen and Zhang, Keto D. (2022) Investigating the Nature of the Luminous Ambiguous Nuclear Transient ASASSN-17jz. Astrophysical Journal, 933 (2). Art. No. 196. ISSN 0004-637X. doi:10.3847/1538-4357/ac74b9.

[img] PDF - Published Version
Creative Commons Attribution.

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


We present observations of the extremely luminous but ambiguous nuclear transient (ANT) ASASSN-17jz, spanning roughly 1200 days of the object’s evolution. ASASSN-17jz was discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) in the galaxy SDSS J171955.84+414049.4 on UT 2017 July 27 at a redshift of z = 0.1641. The transient peaked at an absolute B-band magnitude of M_(B,peak) = −22.81, corresponding to a bolometric luminosity of L_(bol,peak) = 8.3 × 10⁴⁴ erg s⁻¹, and exhibited late-time ultraviolet emission that was still ongoing in our latest observations. Integrating the full light curve gives a total emitted energy of E_(tot) = (1.36 ±0.08) × 10⁵² erg, with (0.80 ± 0.02) × 10⁵² erg of this emitted within 200 days of peak light. This late-time ultraviolet emission is accompanied by increasing X-ray emission that becomes softer as it brightens. ASASSN-17jz exhibited a large number of spectral emission lines most commonly seen in active galactic nuclei (AGNs) with little evidence of evolution. It also showed transient Balmer features, which became fainter and broader over time, and are still being detected >1000 days after peak brightness. We consider various physical scenarios for the origin of the transient, including supernovae (SNe), tidal disruption events, AGN outbursts, and ANTs. We find that the most likely explanation is that ASASSN-17jz was a SN IIn occurring in or near the disk of an existing AGN, and that the late-time emission is caused by the AGN transitioning to a more active state.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Holoien, Thomas W.-S.0000-0001-9206-3460
Neustadt, Jack M. M.0000-0001-7351-2531
Auchettl, Katie0000-0002-4449-9152
Hinkle, Jason T.0000-0001-9668-2920
Romero-Cañizales, Cristina0000-0001-6301-9073
Shappee, Benjamin. J.0000-0003-4631-1149
Kochanek, Christopher S.0000-0001-6017-2961
Chen, Ping0000-0003-0853-6427
Dong, Subo0000-0002-1027-0990
Prieto, Jose L.0000-0003-0943-0026
Thompson, Todd A.0000-0003-2377-9574
Brink, Thomas G.0000-0001-5955-2502
Filippenko, Alexei V.0000-0003-3460-0103
Zheng, WeiKang0000-0002-2636-6508
Bersier, David0000-0001-7485-3020
Bose, Subhash0000-0003-3529-3854
Burgasser, Adam J.0000-0002-6523-9536
de Jaeger, Thomas0000-0001-6069-1139
Im, Myungshin0000-0002-8537-6714
Jun, Hyunsung D.0000-0003-1470-5901
Lansbury, George0000-0002-5328-9827
Stern, Daniel0000-0003-2686-9241
Tucker, Michael A.0000-0002-2471-8442
Valenti, Stefano0000-0001-8818-0795
Zhang, Keto D.0000-0002-9955-8797
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 September 15; revised 2022 May 6; accepted 2022 May 26; published 2022 July 14. The authors thank Y. Chen, J. Mauerhan, C. Melis, C. C. Steidel, and R. L. Theios for obtaining follow-up data. We thank Lizelke Klindt and Fiona Harrison for contributing to observations made with the Palomar 200 inch telescope. U.C. Berkeley students Nick Choksi, Edward Falcon, Romain Hardy, Goni Halevy, Emily Ma, Yukei Murakami, Jackson Sipple, Costas Soler, Samantha Stegman, James Sunseri, Sergiy Vasylyev, and Jeremy Wayland contributed to observations with the Lick Nickel 1 m telescope. We are grateful to S. Gomez for assistance with running MOSFiT SN models. We thank the Swift PI, the Observation Duty Scientists, and the science planners for promptly approving and executing our Swift observations. The Las Cumbres Observatory and its staff are gratefully acknowledged for their continuing assistance with the ASAS-SN project. We thank the staffs of the various observatories where data were obtained for their assistance. ASAS-SN is supported by the Gordon and Betty Moore Foundation through grant GBMF5490 to the Ohio State University and National Science Foundation (NSF) grant AST-1515927. Development of ASAS-SN has been supported by NSF grant AST-0908816, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics at the Ohio State University, the Chinese Academy of Sciences South America Center for Astronomy (CASSACA), the Villum Foundation, and George Skestos. Support for T.W.-S.H. was provided by NASA through the NASA Hubble Fellowship grant HST-HF2-51458.001-A awarded by the Space Telescope Science Institute (STScI), which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. P.J.V. is supported by the National Science Foundation Graduate Research Fellowship Program Under grant No. DGE-1343012. C.R.-C. acknowledges financial support from the Chinese Academy of Sciences (CAS), through the CAS South America Center for Astronomy (CASSACA) and CONICYT grant CAS16013. K.Z.S., C.S.K., and T.A.T. are supported by NSF grants AST-1515876, AST-1515927, and AST-1814440. B.J.S., C.S.K., and K.Z.S. are supported by NSF grant AST-1907570/AST-1908952. B.J.S. is also supported by NSF grants AST-1920392 and AST-1911074. Support for J.L.P. and C.R.-C. is provided in part by ANID through the Fondecyt regular grant 1191038 and through the Millennium Science Initiative grant ICN12009, awarded to The Millennium Institute of Astrophysics (MAS). T.A.T. is supported in part by NASA grant 80NSSC20K0531. A.V.F.'s supernova research group at U.C. Berkeley has been supported by the TABASGO Foundation, Gary and Cynthia Bengier (T.d.J. was a Bengier Postdoctoral Fellow), the Christopher R. Redlich Fund, the Miller Institute for Basic Research in Science (A.V.F. is a Miller Senior Fellow), NASA/HST grant GO-15166 from STScI, and Google (K.D.Z. was a Google/Lick Predoctoral Fellow). M.I. acknowledges the support from the National Research Foundation (NRF) grants 2020R1A2C3011091 and 2021M3F7A1084525, supervised by the Ministry of Science and ICT (MSIT) of Korea. H.D.J. is supported by the NRF grant 2022R1C1C2013543 funded by the MSIT of Korea. M.A.T. acknowledges support from the Department of Energy Computational Science Graduate Fellowship through grant DE-SC0019323. Research by S.V. is supported by NSF grants AST-1813176 and AST-2008108. Parts of this research were supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Advanced Scientific Computing Research, Department of Energy Computational Science Graduate Fellowship under award No. DE-FG02-97ER25308. This research is based on observations made with the NASA/ESA Hubble Space Telescope obtained from STScI, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 526555. These observations are associated with programs HST-GO-14781, HST-GO-15166, and HST-GO-15312. The National Radio Astronomy Observatory is a facility of the NSF operated under cooperative agreement by Associated Universities, Inc. Research at Lick Observatory is partially supported by a generous gift from Google. A major upgrade of the Kast spectrograph on the Shane 3 m telescope at Lick Observatory was made possible through generous gifts from the Heising-Simons Foundation as well as William and Marina Kast. KAIT and its ongoing operation were made possible by donations from Sun Microsystems, Inc., the Hewlett-Packard Company, AutoScope Corporation, Lick Observatory, the NSF, the University of California, the Sylvia & Jim Katzman Foundation, and the TABASGO Foundation. The European VLBI Network is a joint facility of independent European, African, Asian, and North American radio astronomy institutes. Scientific results from data presented in this publication are derived from the following EVN project code(s): RR011. e-VLBI research infrastructure in Europe is supported by the European Union's Seventh Framework Programme (FP7/2007-2013) under grant agreement No. RI-261525 NEXPReS. The LBT is an international collaboration among institutions in the United States, Italy, and Germany. LBT Corporation partners are The University of Arizona on behalf of the Arizona Board of Regents; Istituto Nazionale di Astrofisica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, The Leibniz Institute for Astrophysics Potsdam, and Heidelberg University; The Ohio State University, representing OSU, University of Notre Dame, University of Minnesota, and University of Virginia. This research uses data obtained through the Telescope Access Program (TAP). Observations obtained with the Hale telescope at Palomar Observatory were obtained as part of an agreement between the National Astronomical Observatories, Chinese Academy of Sciences, and the California Institute of Technology. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and NASA; the observatory was made possible by the generous financial support of the W. M. Keck Foundation. We acknowledge the Keck Target of Opportunity Program for the spectrum obtained on 2017 October 22. This research has made use of the Keck Observatory Archive (KOA), which is operated by the W. M. Keck Observatory and the NASA Exoplanet Science Institute (NExScI), under contract with NASA. Software: FAST (Kriek et al. 2009), IRAF (Tody 1986, 1993), LPipe (Perley 2019), HEAsoft (HEASARC 2014), MOSFiT (Guillochon et al. 2018).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Gordon and Betty Moore FoundationGBMF5490
Mt. Cuba Astronomical FoundationUNSPECIFIED
Center for Cosmology and AstroParticle Physics (CCAPP)UNSPECIFIED
Chinese Academy of Sciences South America Center for Astronomy (CASSACA)CAS16013
Villum FoundationUNSPECIFIED
NASA Hubble FellowshipHST-HF2-51458.001-A
NSF Graduate Research FellowshipDGE-1343012
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)ICN12_009
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1191038
Gary and Cynthia BengierUNSPECIFIED
Miller Institute for Basic Research in ScienceUNSPECIFIED
Christopher R. Redlich FundUNSPECIFIED
National Research Foundation of Korea2020R1A2C3011091
National Research Foundation of Korea2021M3F7A1084525
National Research Foundation of Korea2022R1C1C2013543
Department of Energy (DOE)DE-SC0019323
Australian Research CouncilCE170100013
Department of Energy (DOE)DE-FG02-97ER25308
Heising-Simons FoundationUNSPECIFIED
William and Marina KastUNSPECIFIED
Sun Microsystems, Inc.UNSPECIFIED
Hewlett-Packard CompanyUNSPECIFIED
AutoScope CorporationUNSPECIFIED
Lick ObservatoryUNSPECIFIED
University of CaliforniaUNSPECIFIED
Sylvia and Jim Katzman FoundationUNSPECIFIED
European Research Council (ERC)261525
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:Galaxy accretion disks; Accretion; Active galactic nuclei; Tidal disruption; Supernovae
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Galaxy accretion disks (562); Accretion (14); Active galactic nuclei (16); Tidal disruption (1696); Supernovae (1668)
Record Number:CaltechAUTHORS:20220729-722194000
Persistent URL:
Official Citation:Thomas W.-S. Holoien et al 2022 ApJ 933 196
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115968
Deposited By: George Porter
Deposited On:29 Jul 2022 23:08
Last Modified:29 Jul 2022 23:08

Repository Staff Only: item control page