Journal
ASTROPHYSICAL JOURNAL
Volume 887, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ab55ec
Keywords
methods: observational; shock waves; stars: mass-loss; supernovae: individual; surveys
Categories
Funding
- National Science Foundation [DGE1144469, 1106171]
- GROWTH project - National Science Foundation [1545949]
- EU via ERC [725161]
- ISF [647/18]
- BSF Transformative program
- Kimmel award
- MOST grant [104-2923-M-008-004-MY5, 105-2112-M-008-024-MY3]
- Marie Sklodowska Curie Individual Fellowship within the Horizon 2020 European Union (EU) Framework Programme for Research and Innovation [H2020-MSCA-IF-2017-794467]
- I-Core Program of the Planning and Budgeting Committee
- Israel Science Foundation
- GIF, the German-Israeli Foundation for Scientific Research and Development
- Gordon and Betty Moore Foundation [GBMF5076]
- Heising-Simons Foundation
- NSF CAREER award [1455090]
- NASA/Chandra GI award [GO8-19055A]
- U.S. National Science Foundation [AST-1440341]
- California Institute of Technology
- Oskar Klein Centre
- Weizmann Institute of Science
- University of Maryland
- University of Washington
- Deutsches Elektronen-Synchrotron
- University of Wisconsin-Milwaukee
- TANGO Program of the University System of Taiwan
- UK Science and Technology Facilities Council
- Smithsonian Institution
- Academia Sinica
- National Natural Science Foundation of China (NSFC) [11325313, 11633002]
- National Program on Key Research and Development Project [2016YFA0400803]
- STFC [ST/P006892/1, ST/S006176/1] Funding Source: UKRI
Ask authors/readers for more resources
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 (M-g,M- peak = -20 mag) transient. It is spectroscopically classified as a broad-lined stripped-envelope supernova (Ic-BL SN). The high peak luminosity (L-bol greater than or similar to 3 x 10(44) erg s(-1)), the short rise time (t(rise) = 3 days in g band), and the blue colors at peak (g-r similar to -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 (T-eff greater than or similar to 40,000 K) spectra of a stripped-envelope SN. A retrospective search revealed luminous (M-g similar to M-r approximate to -14 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-gamma,E- iso < 4.9 x 10(48) erg, a limit on X-ray emission L-X < 10(40) erg s(-1), and a limit on radio emission nu L-v less than or similar to 10(37) 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-circle dot) at large radii (3 x 10(14) 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available