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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
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
Astrophysical Journal, Volume 887, No. 2, Article 169, Year 2019
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Description
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 (Mg,peak = -20 mag) transient. It is spectroscopically classified as a broad-lined stripped-envelope supernova (Ic-BL SN). The high peak luminosity (Lbol ≳ 3 × 1044 erg s-1), the short rise time (trise = 3 days in g band), and the blue colors at peak (g-r ∼ -0.4) 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 (Teff ≳ 40,000 K) spectra of a stripped-envelope SN. A retrospective search revealed luminous (Mg ∼ Mr ≈ 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 E γ,iso < 4.9 × 10 48 erg, a limit on X-ray emission LX < 1040 erg s-1, and a limit on radio emission ν Lν ≲ 1037 erg s-1. Taken together, we find that the early (< 10 days) data are best explained by shock breakout in a massive shell of dense circumstellar material (0.02 M⊙) at large radii (3 × 1014 cm) that was ejected in eruptive pre-explosion mass-loss episodes. The late-time (> 10 days) light curve requires an additional energy source, which could be the radioactive decay of Ni-56. © 2019. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Ho, Anna Y.Q.
United States, Pasadena
California Institute of Technology
Goldstein, Daniel A.
United States, Pasadena
California Institute of Technology
Schulze, Steve
Israel, Rehovot
Weizmann Institute of Science Israel
Perley, Daniel A.
United Kingdom, Liverpool
Liverpool John Moores University
Ergon, Mattias
Sweden, Stockholm
Oskar Klein Centre
Gal-Yam, Avishay
Israel, Rehovot
Weizmann Institute of Science Israel
Corsi, Alessandra
United States, Lubbock
Texas Tech University
Andreoni, Igor
United States, Pasadena
California Institute of Technology
Barbarino, Cristina
Sweden, Stockholm
Oskar Klein Centre
Bellm, Eric C.
United States, Seattle
University of Washington
Blagorodnova, Nadia
Netherlands, Nijmegen
Radboud Universiteit
Bright, Joe S.
United Kingdom, Oxford
University of Oxford
Burns, Eric
United States, Washington, D.c.
National Aeronautics and Space Administration
Cenko, Stephen Bradley
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, College Park
University of Maryland, College Park
Cunningham, Virginia A.
United States, College Park
University of Maryland, College Park
De, Kishalay
United States, Pasadena
California Institute of Technology
Dekany, Richard G.
United States, Pasadena
Carnegie Observatories
Dugas, Alison M.
United States, Pasadena
California Institute of Technology
Fender, Robert P.
United Kingdom, Oxford
University of Oxford
Fransson, Claes
Sweden, Stockholm
Oskar Klein Centre
Fremling, Christoffer U.
United States, Pasadena
California Institute of Technology
Graham, Matthew J.
United States, Pasadena
California Institute of Technology
Horesh, Assaf
Israel, Jerusalem
Hebrew University of Jerusalem
Hung, Tiara
United States, Santa Cruz
University of California, Santa Cruz
Kasliwal, Rachna
United States, Pasadena
California Institute of Technology
Kulkarni, Shrinivas R.
United States, Pasadena
California Institute of Technology
Kupfer, Thomas
United States, Santa Barbara
University of California, Santa Barbara
Lunnan, Ragnhild
Sweden, Stockholm
Oskar Klein Centre
Masci, Frank J.
United States, Pasadena
California Institute of Technology
Ngeow, Chow Choong
Taiwan, Taoyuan
National Central University
Nugent, Peter E.
United States, Berkeley
Lawrence Berkeley National Laboratory
Ofek, Eran O.
Israel, Rehovot
Weizmann Institute of Science Israel
Patterson, Maria T.
United States, Seattle
University of Washington
Petitpas, Glen R.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Rusholme, Benjamin A.
United States, Pasadena
California Institute of Technology
Sfaradi, Itai
Israel, Jerusalem
Hebrew University of Jerusalem
Shupe, David L.
United States, Pasadena
California Institute of Technology
Sollerman, Jesper
Sweden, Stockholm
Oskar Klein Centre
Soumagnac, Maayane T.
Israel, Rehovot
Weizmann Institute of Science Israel
Tachibana, Yutaro
Japan, Tokyo
Tokyo Institute of Technology
Taddia, Francesco
Sweden, Stockholm
Oskar Klein Centre
Walters, Richard S.
United States, Pasadena
California Institute of Technology
Wang, Xiaofeng
China, Beijing
Tsinghua University
Yao, Yuhan
United States, Pasadena
California Institute of Technology
Statistics
Citations: 45
Authors: 44
Affiliations: 23
Identifiers
Doi:
10.3847/1538-4357/ab55ec
ISSN:
0004637X
Research Areas
Environmental
Health System And Policy
Study Design
Cohort Study