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Discovery of a Highly Neutronized Ejecta Clump in the Type Ia Supernova Remnant 3C 397

Ohshiro, Yuken and Yamaguchi, Hiroya and Leung, Shing-Chi and Nomoto, Ken'ichi and Sato, Toshiki and Tanaka, Takaaki and Okon, Hiromichi and Fisher, Robert and Petre, Robert and Williams, Brian J. (2021) Discovery of a Highly Neutronized Ejecta Clump in the Type Ia Supernova Remnant 3C 397. Astrophysical Journal Letters, 913 (2). Art. No. L34. ISSN 2041-8205. doi:10.3847/2041-8213/abff5b.

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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).

Item Type:Article
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URLURL TypeDescription Paper
Yamaguchi, Hiroya0000-0002-5092-6085
Leung, Shing-Chi0000-0002-4972-3803
Nomoto, Ken'ichi0000-0001-9553-0685
Sato, Toshiki0000-0001-9267-1693
Tanaka, Takaaki0000-0002-4383-0368
Fisher, Robert0000-0001-8077-7255
Petre, Robert0000-0003-3850-2041
Williams, Brian J.0000-0003-2063-381X
Alternate Title:Discovery of the Highly-Neutronized Ejecta Clump with Enhanced Abundances of Titanium and Chromium in the Type Ia Supernova Remnant 3C 397
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.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)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
NASA Hubble FellowshipHST-AR-15021.001-A
Ministry of Education, Culture, Sports, Science and Technology (MEXT)UNSPECIFIED
Subject Keywords:Supernova remnants
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Supernova remnants (1667)
Record Number:CaltechAUTHORS:20210607-115052913
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Official Citation:Yuken Ohshiro et al 2021 ApJL 913 L34
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109412
Deposited By: George Porter
Deposited On:07 Jun 2021 21:33
Last Modified:16 Nov 2021 19:35

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