The Library
Radio analysis of SN2004C reveals an unusual CSM density profile as a harbinger of core collapse
Tools
Tools
Tools
DeMarchi, Lindsay, Margutti, R., Dittman, J., Brunthaler, A., Milisavljevic, D., Bietenholz, Michael F., Stauffer, C., Brethauer, D., Coppejans, D., Auchettl, K., Alexander, K. D., Kilpatrick, C. D., Bright, Joe S., Kelley, L. Z., Stroh, Michael C. and Jacobson-Galán, W. V. (2022) Radio analysis of SN2004C reveals an unusual CSM density profile as a harbinger of core collapse. The Astrophysical Journal, 938 (1). 84. doi:10.3847/1538-4357/ac8c26 ISSN 0004-637X. [ 🗎 Public]. [ (✓) hoa:511 ]
|
PDF
WRAP-Radio-analysis-of-SN2004C-reveals-an-unusual-CSM-density-profile-as-a-harbinger-of-core-collapse-Coppejans-2022.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (2410Kb) | Preview |
Official URL: http://dx.doi.org/10.3847/1538-4357/ac8c26
Abstract
We present extensive multifrequency Karl G. Jansky Very Large Array (VLA) and Very Long Baseline Array (VLBA) observations of the radio-bright supernova (SN) IIb SN 2004C that span ∼40–2793 days post-explosion. We interpret the temporal evolution of the radio spectral energy distribution in the context of synchrotron self-absorbed emission from the explosion's forward shock as it expands in the circumstellar medium (CSM) previously sculpted by the mass-loss history of the stellar progenitor. VLBA observations and modeling of the VLA data point to a blastwave with average velocity ∼0.06 c that carries an energy of ≈1049 erg. Our modeling further reveals a flat CSM density profile ρCSM ∝ R−0.03±0.22 up to a break radius Rbr ≈ (1.96 ± 0.10) × 1016 cm, with a steep density gradient following ρCSM ∝ R−2.3±0.5 at larger radii. We infer that the flat part of the density profile corresponds to a CSM shell with mass ∼0.021 M☉, and that the progenitor's effective mass-loss rate varied with time over the range (50–500) × 10−5 M☉ yr−1 for an adopted wind velocity vw = 1000 km s−1 and shock microphysical parameters epsilone = 0.1, epsilonB = 0.01. These results add to the mounting observational evidence for departures from the traditional single-wind mass-loss scenarios in evolved, massive stars in the centuries leading up to core collapse. Potentially viable scenarios include mass loss powered by gravity waves and/or interaction with a binary companion.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
||||||||||||||||||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Supernovae, Nuclear astrophysics, Astrophysics, Radio astronomy, Supernovae as distance indicators, Interstellar matter | ||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||||||||||||||||||||||||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||||||||||||||||||||||||||||||
| ISSN: | 0004-637X | ||||||||||||||||||||||||||||||||||||
| Official Date: | 14 October 2022 | ||||||||||||||||||||||||||||||||||||
| Dates: |
|
||||||||||||||||||||||||||||||||||||
| Volume: | 938 | ||||||||||||||||||||||||||||||||||||
| Number: | 1 | ||||||||||||||||||||||||||||||||||||
| Number of Pages: | 21 | ||||||||||||||||||||||||||||||||||||
| Article Number: | 84 | ||||||||||||||||||||||||||||||||||||
| DOI: | 10.3847/1538-4357/ac8c26 | ||||||||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||||||||||||||||||||
| Date of first compliant deposit: | 7 November 2022 | ||||||||||||||||||||||||||||||||||||
| Date of first compliant Open Access: | 8 November 2022 | ||||||||||||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
|
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
Downloads
Downloads per month over past year
