Discovery of a Highly Neutronized Ejecta Clump in the Type Ia Supernova Remnant 3C 397
Abstract
The supernova remnant (SNR) 3C 397 is thought to originate from a Type Ia supernova (SN Ia) explosion of a near-Chandrasekhar-mass (M_(Ch)) progenitor, based on the enhanced abundances of Mn and Ni revealed by previous X-ray study with Suzaku. Here we report follow-up XMM-Newton observations of this SNR, conducted with the aim of investigating the detailed spatial distribution of the Fe-peak elements. We have discovered an ejecta clump with extremely high abundances of Ti and Cr, in addition to Mn, Fe, and Ni, in the southern part of the SNR. The Fe mass of this ejecta clump is estimated to be ~0.06 M_⊙, under the assumption of a typical Fe yield for SNe Ia (i.e., ~0.8 M_⊙). The observed mass ratios among the Fe-peak elements and Ti require substantial neutronization that is achieved only in the innermost regions of a near-M_(Ch) SN Ia with a central density of ρ_c ~ 5 × 10⁹ g cm⁻³, significantly higher than typically assumed for standard near-MCh SNe Ia (ρ_c ~ 2 × 10⁹ g cm⁻³). The overproduction of the neutron-rich isotopes (e.g., ⁵⁰Ti and ⁵⁴Cr) is significant in such high-ρ_c SNe Ia, with respect to the solar composition. Therefore, if 3C 397 is a typical high-ρ_c near-M_(Ch) SN Ia remnant, the solar abundances of these isotopes could be reproduced by the mixture of the high- and low-ρ_c near-M_(Ch) and sub-M_(Ch) Type Ia events, with ≾20% being high-ρ_c near-M_(Ch).
Additional Information
© 2021. The American Astronomical Society. Received 2021 April 2; revised 2021 May 5; accepted 2021 May 8; published 2021 June 4. We are grateful to Ryota Fukai and Takaya Nozawa for discussion about isotopic compositions of meteorites and dust formation in SNe. This work is supported by Grants-in-Aid for Scientific Research (KAKENHI) of the Japanese Society for the Promotion of Science (JSPS) grant Nos. JP19H00704 (H.Y.), JP20H00175 (H.Y.) JP19H01936 (T.T.), JP17K05382 (K.N.), JP20K04024 (K.N.), and JP19J14025 (H.O.). S.C.L. acknowledges support from grants HST-AR-15021.001-A and 80NSSC18K1017. K.N. and S.C.L. have been supported by the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan. R.F. acknowledges support from NASA grant numbers 80NSSC18K1013 and 80NSSC19K0601. This work used the Extreme Science and Engineering Discovery Environment (XSEDE) Stampede 2 supercomputer at the University of Texas at Austin's Texas Advanced Computing Center through allocation TG-AST100038, supported by National Science Foundation grant number ACI-1548562.Attached Files
Published - Ohshiro_2021_ApJL_913_L34.pdf
Accepted Version - 2105.04101.pdf
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Additional details
- Alternative title
- Discovery of the Highly-Neutronized Ejecta Clump with Enhanced Abundances of Titanium and Chromium in the Type Ia Supernova Remnant 3C 397
- Eprint ID
- 109412
- Resolver ID
- CaltechAUTHORS:20210607-115052913
- JP19H00704
- Japan Society for the Promotion of Science (JSPS)
- JP20H00175
- Japan Society for the Promotion of Science (JSPS)
- JP19H01936
- Japan Society for the Promotion of Science (JSPS)
- JP17K05382
- Japan Society for the Promotion of Science (JSPS)
- JP20K04024
- Japan Society for the Promotion of Science (JSPS)
- JP19J14025
- Japan Society for the Promotion of Science (JSPS)
- HST-AR-15021.001-A
- NASA Hubble Fellowship
- 80NSSC18K1017
- NASA
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- 80NSSC18K1013
- NASA
- 80NSSC19K0601
- NASA
- TG-AST100038
- NASA
- ACI-1548562
- NSF
- Created
-
2021-06-07Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field
- Caltech groups
- TAPIR, Walter Burke Institute for Theoretical Physics