期刊
ASTROPHYSICAL JOURNAL
卷 927, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac478e
关键词
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资金
- National Science Foundation (NSF) [AST-2034437]
- Caltech
- IPAC
- Weizmann Institute for Science
- Oskar Klein Center (OKC) at Stockholm University
- University of Maryland
- Deutsches Elektronen-Synchrotron
- Humboldt University
- TANGO Consortium of Taiwan
- University of Wisconsin at Milwaukee
- Trinity College Dublin
- Lawrence Livermore National Laboratories
- IN2P3, France
- NSF [1106171]
- Heising-Simons Foundation [12540303]
- UK Science and Technology Facilities Council
- European Organisation for Astronomical Research in the Southern Hemisphere under ESO programs [106.21U2, 106.216C]
- W. M. Keck Foundation
- G.R.E.A. T. research environment - Vetenskapsradet, the Swedish Research Council [2016-06012]
- WennerGren Foundation
- David and Lucille Packard Foundation
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [759194-USNAC]
- Benoziyo Prize Postdoctoral Fellowship
- Bengier-Winslow-Robertson Fellowship
- EU funding under Marie Sklodowska-Curie grant [H2020-MSCA-IF-2018-842471]
- Marie Sklodowska-Curie Individual Fellowship within the Horizon 2020 European Union (EU) Framework Programme for Research and Innovation [H2020-MSCA-IF-2017-794467]
- GROWTH project - NSF [1545949]
- Christopher R. Redlich Fund
- Miller Institute for Basic Research in Science
- EU via ERC grant [725161]
- ISF GW excellence center
- IMOS space infrastructure grant
- BSF/Transformative
- GIF grants
- Benoziyo Endowment Fund for the Advancement of Science
- Deloro Institute for Advanced Research in Space and Optics
- Veronika A. Rabl Physics Discretionary Fund
- Minerva
- Yeda-Sela
- Schwartz/Reisman Collaborative Science Program
We present observations of SN 2021csp, a newly identified type of supernova with unique carbon features and fast-evolving characteristics. The results suggest that its origin may be distinct from classical supernovae and more similar to other fast-evolving interacting transients. Possible progenitor scenarios are discussed.
We present observations of SN 2021csp, the second example of a newly identified type of supernova (SN) hallmarked by strong, narrow, P Cygni carbon features at early times (Type Icn). The SN appears as a fast and luminous blue transient at early times, reaching a peak absolute magnitude of -20 within 3 days due to strong interaction between fast SN ejecta (v approximate to 30,000 km s(-1)) and a massive, dense, fast-moving C/O wind shed by the WC-like progenitor months before explosion. The narrow-line features disappear from the spectrum 10-20 days after explosion and are replaced by a blue continuum dominated by broad Fe features, reminiscent of Type Ibn and IIn supernovae and indicative of weaker interaction with more extended H/He-poor material. The transient then abruptly fades similar to 60 days post-explosion when interaction ceases. Deep limits at later phases suggest minimal heavy-element nucleosynthesis, a low ejecta mass, or both, and imply an origin distinct from that of classical Type Ic SNe. We place SN 2021csp in context with other fast-evolving interacting transients, and discuss various progenitor scenarios: an ultrastripped progenitor star, a pulsational pair-instability eruption, or a jet-driven fallback SN from a Wolf-Rayet (W-R) star. The fallback scenario would naturally explain the similarity between these events and radio-loud fast transients, and suggests a picture in which most stars massive enough to undergo a W-R phase collapse directly to black holes at the end of their lives.
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