A study of the progenitors of Type Ia supernovae with X-ray precision spectroscopy of their remnants

2020 Fiscal Year Final Research Report

• Project/Area Number: 16H03983
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: University of Miyazaki
• Principal Investigator: Mori Koji 宮崎大学, 工学部, 教授 (00404393)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Keywords: 超新星残骸 / Ｘ線CCD / ひとみ衛星 / XRISM衛星

Outline of Final Research Achievements

Type Ia supernovae are utilized as cosmic standard candles because of their uniform absolute-luminosities after some empirical corrections. In this context, systematic variations in luminosity due to the diversity of their progenitors have been investigated. We performed X-ray spatially-resolved spectroscopic studies of the young remnants of Type Ia supernovae in order to derive the information of their progenitors and explosions. We showed that Kepler's supernova might have been originated from an asymmetric explosion. We also performed X-ray studies of other types of supernova remnants. As observation device for this kind of studies, we developed X-ray CCD cameras for Hitomi and XRISM observatories.

Free Research Field

高エネルギー宇宙物理学

Academic Significance and Societal Importance of the Research Achievements

我々が提唱するIa型超新星残骸のX線精密撮像分光を用いて親星の起源に迫る手法は、一般的に用いられる可視光観測とは異なるアプローチです。互いに相補的な関係にあり、両者を統合して解釈することで、これまでになかった知見をもたらすことが期待できます。カロリメータを用いた超新星残骸のX線精密撮像分光は次の XRISM 衛星に持ち越されましたが、本研究でそれにむけてデータ解析の観点でも、観測装置の開発という観点でも準備を整えることができました。