Evidence for Late-stage Eruptive Mass Loss in the Progenitor to SN2018gep, a Broad-lined Ic Supernova: Pre-explosion Emission and a Rapidly Rising Luminous Transient
Year: 2019
Type: article
Abstract: We present detailed observations of ZTF18abukavn (SN2018gep), discovered in high-cadence data from the Zwicky Transient Facility as a rapidly rising (1.4 ± 0.1 mag hr−1) and luminous ( mag) transient. It is spectroscopically classified as a broad-lined stripped-envelope supernova (Ic-BL SN). The high peak luminosity ( ), the short rise time ( in g band), and the blue colors at peak ( ) all resemble the high-redshift Ic-BL iPTF16asu, as well as several other unclassified fast transients. The early discovery of SN2018gep (within an hour of shock breakout) enabled an intensive spectroscopic campaign, including the highest-temperature ( ) spectra of a stripped-envelope SN. A retrospective search revealed luminous ( mag) emission in the days to weeks before explosion, the first definitive detection of precursor emission for a Ic-BL. We find a limit on the isotropic gamma-ray energy release , a limit on X-ray emission , and a limit on radio emission . Taken together, we find that the early ( ) data are best explained by shock breakout in a massive shell of dense circumstellar material (0.02 ) at large radii ( ) that was ejected in eruptive pre-explosion mass-loss episodes. The late-time ( ) light curve requires an additional energy source, which could be the radioactive decay of Ni-56.
Source: The Astrophysical Journal
Authors: Anna Y. Q. Ho, Daniel A. Goldstein, Steve Schulze, David K. Khatami, Daniel A. Perley, Mattias Ergon, Avishay Gal-Yam, Alessandra Corsi, Igor Andreoni, Cristina Barbarino, Eric C. Bellm, Nadia Blagorodnova, Joe S. Bright, E. Burns, S. Bradley Cenko, Virginia Cunningham, Kishalay De, Richard Dekany, Alison Dugas, Rob P. Fender, Claes Fransson, Christoffer Fremling, Adam Goldstein, Matthew J. Graham, David Hale, Assaf Horesh, Tiara Hung, Mansi M. Kasliwal, N. Paul M. Kuin, S. R. Kulkarni, Thomas Kupfer, Ragnhild Lunnan, Frank J. Masci, Chow-Choong Ngeow, Peter E. Nugent, Eran O. Ofek, Maria T. Patterson, Glen Petitpas, Ben Rusholme, Hanna Sai, Itai Sfaradi, David L. Shupe, Jesper Sollerman, Maayane T. Soumagnac, Yutaro Tachibana, Francesco Taddia, Richard Walters, Xiaofeng Wang, Yuhan Yao, Xinhan Zhang
Institutions: California Institute of Technology, Weizmann Institute of Science, University of California, Berkeley, Liverpool John Moores University, Stockholm University, AlbaNova, Texas Tech University, University of Washington, Radboud University Nijmegen, University of Oxford, Goddard Space Flight Center, Joint Space Science Institute, University of Maryland, College Park, Universities Space Research Association, Hebrew University of Jerusalem, University of California, Santa Cruz, University College London, University of California, Santa Barbara, Kavli Institute for Theoretical Physics, Infrared Processing and Analysis Center, National Central University, Lawrence Berkeley National Laboratory, Center for Astrophysics Harvard & Smithsonian, Tsinghua University, Tokyo Institute of Technology
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, Smithsonian Institution, National Aeronautics and Space Administration, Gordon and Betty Moore Foundation, University of Wisconsin-Milwaukee, California Institute of Technology, University of Washington, European Commission, Weizmann Institute of Science, German-Israeli Foundation for Scientific Research and Development, National Natural Science Foundation of China, Academia Sinica, Israel Science Foundation, Liverpool John Moores University, University System of Taiwan, Instituto de Astrofísica de Andalucía, Smithsonian Astrophysical Observatory, Horizon 2020 Framework Programme, Science and Technology Facilities Council, Deutsches Elektronen-Synchrotron, Planning and Budgeting Committee of the Council for Higher Education of Israel, Los Alamos National Laboratory, H2020 European Research Council, Eurostars
Awards: New Theoretical Insights into Cosmic Cataclysms, The SED Machine: an Efficient Transient Classifier, G2140688951, CAREER: Radio and gravitational-wave emission from the largest explosions since the Big Bang, G270033162, G2922997797, G3345895242, ZWICKY TRANSIENT FACILITY, G3699904754, G434337789, 基于极大视场多波段巡天的时域天文学前沿研究, G4702856611, Celestial fireworks: revealing the physics of the time-variable sky, G4868272707, G4937468798, Unmasking the Progenitors and Energy Sources of Superluminous Supernovae, G6123861678, PIRE: GROWTH: Global Relay of Observatories Watching Transients Happen, G6329715174, G6371142278, G6671297155, G6920442398, Graduate Research Fellowship Program (GRFP), G7295407750, G800705978, G8019869205, G8512683158, G879559570
OpenAlex ID: W2995281187