A Rapid Ionization Change in the Nebular-phase Spectra of the Type Ia SN 2011fe
Abstract
Abstract We present three new spectra of the nearby Type Ia supernova (SN Ia) 2011fe covering ≈480–850 days after maximum light and show that the ejecta undergoes a rapid ionization shift at ∼500 days after explosion. The prominent Fe iii emission lines at ≈4600 Å are replaced with Fe i +Fe ii blends at ∼4400 Å and ∼5400 Å. The ≈7300 Å feature, which is produced by [Fe ii ]+[Ni ii ] at ≲400 days after explosion, is replaced by broad (≈±15,000 km s −1 ) symmetric [Ca ii ] emission. Models predict this ionization transition occurring ∼100 days later than what is observed, which we attribute to clumping in the ejecta. Finally, we use the nebular-phase spectra to test several proposed progenitor scenarios for SN 2011fe. Nondetections of H and He exclude nearby nondegenerate companions, [O i ] nondetections disfavor the violent merger of two white dwarfs, and the symmetric emission-line profiles favor a symmetric explosion.
- Publication Date:
- Research Org.:
- Krell Institute, Ames, IA (United States); Univ. of Hawaii at Manoa, Honolulu, HI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1845928
- Alternate Identifier(s):
- OSTI ID: 1981273
- Grant/Contract Number:
- SC0019323; AST-1814440; AST-1907570
- Resource Type:
- Published Article
- Journal Name:
- The Astrophysical Journal. Letters
- Additional Journal Information:
- Journal Name: The Astrophysical Journal. Letters Journal Volume: 926 Journal Issue: 2; Journal ID: ISSN 2041-8205
- Publisher:
- American Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; type Ia supernovae; supernovae; white dwarf stars
Citation Formats
Tucker, M. A., Ashall, C., Shappee, B. J., Kochanek, C. S., Stanek, K. Z., and Garnavich, P. A Rapid Ionization Change in the Nebular-phase Spectra of the Type Ia SN 2011fe. United States: N. p., 2022.
Web. doi:10.3847/2041-8213/ac4fbd.
Tucker, M. A., Ashall, C., Shappee, B. J., Kochanek, C. S., Stanek, K. Z., & Garnavich, P. A Rapid Ionization Change in the Nebular-phase Spectra of the Type Ia SN 2011fe. United States. https://doi.org/10.3847/2041-8213/ac4fbd
Tucker, M. A., Ashall, C., Shappee, B. J., Kochanek, C. S., Stanek, K. Z., and Garnavich, P. Mon .
"A Rapid Ionization Change in the Nebular-phase Spectra of the Type Ia SN 2011fe". United States. https://doi.org/10.3847/2041-8213/ac4fbd.
@article{osti_1845928,
title = {A Rapid Ionization Change in the Nebular-phase Spectra of the Type Ia SN 2011fe},
author = {Tucker, M. A. and Ashall, C. and Shappee, B. J. and Kochanek, C. S. and Stanek, K. Z. and Garnavich, P.},
abstractNote = {Abstract We present three new spectra of the nearby Type Ia supernova (SN Ia) 2011fe covering ≈480–850 days after maximum light and show that the ejecta undergoes a rapid ionization shift at ∼500 days after explosion. The prominent Fe iii emission lines at ≈4600 Å are replaced with Fe i +Fe ii blends at ∼4400 Å and ∼5400 Å. The ≈7300 Å feature, which is produced by [Fe ii ]+[Ni ii ] at ≲400 days after explosion, is replaced by broad (≈±15,000 km s −1 ) symmetric [Ca ii ] emission. Models predict this ionization transition occurring ∼100 days later than what is observed, which we attribute to clumping in the ejecta. Finally, we use the nebular-phase spectra to test several proposed progenitor scenarios for SN 2011fe. Nondetections of H and He exclude nearby nondegenerate companions, [O i ] nondetections disfavor the violent merger of two white dwarfs, and the symmetric emission-line profiles favor a symmetric explosion.},
doi = {10.3847/2041-8213/ac4fbd},
journal = {The Astrophysical Journal. Letters},
number = 2,
volume = 926,
place = {United States},
year = {Mon Feb 21 00:00:00 EST 2022},
month = {Mon Feb 21 00:00:00 EST 2022}
}
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