京都大学教育研究振興財団助成事業
成 果 報 告 書
令和元 年 ９月 １０日
公益財団法人京都大学教育研究振興財団会 長

藤洋 作

助 成 の 種 類
申請時の科研費
研 究 課 題 名様所属部局

理学研究科職名

講師

氏名

李 兆衡

平成３０年度 ・研究活動推進助成

A comprehensive survey of core-collapse supernova remnant
models using end-to-end simulations of massive star evolution

上記以外で助成金を 充 当 し た
研 究 内 容助成金充当に関わる共同研究者（所属・職名・氏名）

発表学会文献等（この研究成果を発表した学会・文献等）(selected publications in refereed journals related to thisproject) H. Martínez-Rodríguez, C. Badenes, S.-H. Lee et al., ApJ, 865, 151, 2018; S. Orlando,M. Miceli, O. Petruk, M. Ono, S. Nagataki, M.A. Aloy, P. Mimica, S.-H. Lee et al., A&A, 622,A73, 2019; H. Yasuda & S.-H. Lee, ApJ, 876, 27, 2019; M. Katsuragawa, S. Nakashima, H.
Matsumura, T. Tanaka, H. Uchida, S.-H. Lee et al., PASJ, 70, 110, 2018; (selectedpresentations related to this project) VHEPU2018, Vietnam; Supernova Remnants II: An Odyssey
in Space after Stellar Deaths, Greece, June 2019

成 果 の 概 要

研究内容・研究成果・今後の見通しなどについて、 簡略に、A４版・和文で作成し、添付して下さい。（タイトルは「成果の概要／報告者名」）

1,000,000
1,000,0000

交付 を 受 けた 助成 金額
使 用 し た 助 成 金 額
返納すべき助成金額
費会

計報

告助成金の使途内訳

目金円円円
額

機材購入

314,463

精算旅費 ハーバード大学

218,966

精算旅費 東京大学ＩＰＭＵ

70,600

精算旅費 兵庫県立大学

32,940

立替払 学会登録費 VHEPU2018

32,246

精算旅費 神戸市瑞宝園（教室合宿）

55,220

今後の使用見込み

275,565（今回の助成に対する感想、今後の助成に望むこと等お書き下さい。助成事業の参考にさせていただきます。）

当財団の助成について成果の概要／李兆衡 リー・シウハン
In the past fiscal year under the support of the Kyoto University Foundation, our international(Japan-US) collaboration has embarked on a new endeavor on understanding the phenomena
associated exploding dying stars (supernovae, SNe) and their remnants (supernova remnants,SNRs). We are attempting to connect the observed properties of SNRs in various wavebands tothe nature of their progenitor stars as well as their circumstellar environment (CSM), in orderto systematically understand the origin of the rich diversity of observed SNRs in the Milky Way
and neighbor galaxies.
To do so, we are developing a simulation framework which can seamlessly connect state-ofthe-art numerical models of stellar evolution, supernova explosion and nucleosynthesis, andhydrodynamical and plasma evolution in SNRs. We are now in the processing of searching forcharacteristic observational aspects, such as broadband X-ray spectra, that can help us
distinguish SNRs with different progenitor origins and impacts by different surrounding

environments.

Figure 1 - Left: high-resolution synthetic X-ray spectrum of a sub-Chandrasekhar model of Type Ia SNR, comparing the current
spectroscopic capabilities of the Suzaku telescope and the near-future XRISM telescope. Right: a zoom-in view of the Fe-Ka lineemission complex, revealing the detailed structures of the spectrum and its potential of distinguishing progenitor origins.

As an example, we have published a study which investigates the inter-relation among the timeevolving synthetic X-ray spectra, dynamical properties, and the nature of the exploded whitedwarf stars for Type-Ia supernova remnants, and compared our numerical results with existingobservational data of Ia SNRs (Martínez-Rodríguez, Badenes, Lee et al., ApJ, 865, 151, 2018).
We discovered that the bulk properties of Ia SNRs are mainly dictated by the difference in thesurrounding environments of the SNRs rather than the subtle distinctions in the white dwarf
explosion (in particular, a sub-Chandrasekhar vs a Chandrasekhar progenitor). However, wealso predicted that the soon-coming era of micro-calorimetric spectroscopy realized by nextgeneration X-ray imaging space telescopes such as XRISM and ATHENA (with superior energy
resolutions compared to current instruments such as Suzaku and Chandra) is going to allow fora detailed diagnostic of progenitor origins of Ia SNRs (see Figure 1).
We are now extending the same technique to core-collapse SNRs from exploded massive stars
by performing a large-scale survey of hydro models encompassing an extensive array ofdifferent massive star progenitors and CSMs (Jacovich, Patnaude, Lee et al., in prep). The results
will be published in a refereed journal in the very near future.
Our results so far have been presented in various occasions, including the international
conference on supernova remnant in June, 2019 at Crete, Greece (Supernova Remnants II: AnOdyssey in Space after Stellar Deaths), and the American Astronomical Society Meeting.
Finally, we very much appreciate the financial support by the Kyoto University Foundation
during the last fiscal year which has been indispensable to the progress of this long-term
project. Thanks to this opportunity, our project has been selected for a KAKENHI C starting fromthe fiscal year of 2019.