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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A Non-equipartition Shock Wave Traveling in a Dense Circumstellar Environment around SN 2020oi
Astrophysical Journal, Volume 903, No. 2, Article 132, Year 2020
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Description
We report the discovery and panchromatic follow-up observations of the young Type Ic supernova (SN Ic) SN 2020oi in M100, a grand-design spiral galaxy at a mere distance of 14 Mpc. We followed up with observations at radio, X-ray, and optical wavelengths from only a few days to several months after explosion. The optical behavior of the supernova is similar to those of other normal SNe Ic. The event was not detected in the X-ray band but our radio observations revealed a bright mJy source (Lν ≈ 1.2× 1027 erg s-1 Hz-1). Given the relatively small number of stripped envelope SNe for which radio emission is detectable, we used this opportunity to perform a detailed analysis of the comprehensive radio data set we obtained. The radio-emitting electrons initially experience a phase of inverse Compton cooling, which leads to steepening of the spectral index of the radio emission. Our analysis of the cooling frequency points to a large deviation from equipartition at the level of e/ B ⪆ 200, similar to a few other cases of stripped envelope SNe. Our modeling of the radio data suggests that the shock wave driven by the SN ejecta into the circumstellar matter (CSM) is moving at ∼ 3× 104 km s-1. Assuming a constant mass loss from the stellar progenitor, we find that the mass-loss rate is ⊙M≈ 1.4× 10-4 M⊙ yr-1 for an assumed wind velocity of 1000 km s-1. The temporal evolution of the radio emission suggests a radial CSM density structure steeper than the standard r -2. © 2020. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Horesh, Assaf
Israel, Jerusalem
Hebrew University of Jerusalem
Sfaradi, Itai
Israel, Jerusalem
Hebrew University of Jerusalem
Ergon, Mattias
Sweden, Stockholm
Oskar Klein Centre
Barbarino, Cristina
Sweden, Stockholm
Oskar Klein Centre
Sollerman, Jesper
Sweden, Stockholm
Oskar Klein Centre
Moldón, Javier
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
United Kingdom, Manchester
The University of Manchester
Dobie, Dougal A.
Australia, Sydney
The University of Sydney
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Schulze, Steve
Israel, Rehovot
Weizmann Institute of Science Israel
Pérez-Torres, M. A.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Williams, David R.A.
United Kingdom, Manchester
The University of Manchester
United Kingdom, Oxford
University of Oxford
Fremling, Christoffer U.
United States, Pasadena
California Institute of Technology
Gal-Yam, Avishay
Israel, Rehovot
Weizmann Institute of Science Israel
Kulkarni, Shrinivas R.
United States, Pasadena
California Institute of Technology
O'Brien, Andrew N.
Australia, Sydney
The University of Sydney
Lundqvist, Peter
Sweden, Stockholm
Oskar Klein Centre
Murphy, Tara
Australia, Sydney
The University of Sydney
Fender, Robert P.
United Kingdom, Oxford
University of Oxford
Anand, Shreya G.
United States, Pasadena
California Institute of Technology
Belicki, Justin
United States, Pasadena
California Institute of Technology
Bellm, Eric C.
United States, Seattle
University of Washington
Coughlin, Michael W.
United States, Minneapolis
University of Minnesota Twin Cities
De, Kishalay
United States, Pasadena
California Institute of Technology
Golkhou, Vahid Zach
United States, Seattle
University of Washington
Graham, Matthew J.
United States, Pasadena
California Institute of Technology
David A. Green, David A.
United Kingdom, Cambridge
Department of Physics
Hankins, Matthew J.
United States, Pasadena
California Institute of Technology
Kasliwal, Rachna
United States, Pasadena
California Institute of Technology
Kupfer, Thomas
United States, Santa Barbara
University of California, Santa Barbara
Laher, Russ R.
United States, Pasadena
California Institute of Technology
Masci, Frank J.
United States, Pasadena
California Institute of Technology
Miller, Adam A.
United States, Evanston
Northwestern University
United States, Chicago
Adler Planetarium
Neill, James Don
United States, Pasadena
California Institute of Technology
Ofek, Eran O.
Israel, Rehovot
Weizmann Institute of Science Israel
Perrott, Yvette C.
New Zealand, Wellington
Victoria University of Wellington
Porter, Michael D.
United States, Pasadena
California Institute of Technology
Rigault, Mickael
France, Aubiere
Laboratoire de Physique de Clermont
Rodriguez, Hector
United States, Pasadena
California Institute of Technology
Rusholme, Benjamin A.
United States, Pasadena
California Institute of Technology
Shupe, David L.
United States, Pasadena
California Institute of Technology
Titterington, David J.
United Kingdom, Cambridge
Department of Physics
Statistics
Citations: 15
Authors: 40
Affiliations: 17
Identifiers
Doi:
10.3847/1538-4357/abbd38
ISSN:
0004637X
Research Areas
Environmental
Study Design
Cohort Study