Uncovering the mass-loss history of massive stars and the diversity of core-collapse supernovae through the circumstellar dust

2017 Fiscal Year Final Research Report

• Project/Area Number: 26400223
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: Nozawa Takaya 国立天文台, 理論研究部, 特任助教 (90435975)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: ダスト / 超新星爆発 / 減光曲線 / 大質量星 / プレソーラー粒子 / 物質進化 / 可視光赤外線観測

Outline of Final Research Achievements

We investigate the origin of cosmic solid particles (dust grains) in the early unvierse. We find that very massive first stars could be the first sources of dust grains in the universe. We also show that large amounts of dust grains and flat extinction curves in high-redshift galaxies can be explained self-consistently by the state-of-the-art dust evolution model.
We study on the extinction of Type Ia supernovae, showing that the unusual extinction curves observed for Type Ia supernovae are predominantly caused by interstellar dust. We also demonstrate that typical sizes of the interstellar dust are a few times smaller than that in our Galaxy.
On the other hand, we constrain the physical condition of supernova ejecta from the measured sizes of presolar grains which are discovered in meteorites. We also derive the sizes of presolar grains that can survive the destruction in the interstellar medium and the thermal diffusion of isotopes in parent bodies of meteorites.

Free Research Field

理論天文学