Study on the origin of interstellar dust based on Infrared Observations

这项研究的重点是由演化的大质量恒星（e。例如，在一个实施例中，超新星，沃尔夫-拉叶双星活动）和新星。根据AKARI以及8米级地面望远镜（Subaru/COMICS和Gemini-S/TReCS）上的中红外仪器的观测，对它们周围形成的尘埃的化学成分和质量和温度的时间演变进行了研究。这项研究的一个重要发现是，至少在WR 140的情况下，由于成核后可能的破坏过程，观察到的在恶劣的星周环境中幸存下来成为星际尘埃的尘埃量很小。这一结果可能表明，WR双星活动可能不会直接作为早期宇宙的主要尘埃预算。这项研究还成功地证明了新星V1280 Sco从最初爆发开始超过2000天的尘埃形成历史。

This study focuses on the dust formation by evolved massive stars(e. g., supernovae, Wolf-Rayet binary activities) and novae. The chemical composition and the temporal evolution of mass and temperature of dust formed around them have been examined based on observations with AKARI as well as with mid-infrared instruments onbaord 8m class ground-based telescopes(Subaru/COMICS and Gemini-S/TReCS). One of the important findings of this study is that, at least in the case of WR140, the observed amount of dust that survives the harsh circumstellar environment to become the interstellar dust is small because of the possible destruction process after the nucleation. This result may suggest that WR binary activity may not directly contribute as a major dust budget in the early universe. This study also have successfully demonstrated the dust formation history of nova V1280Sco over 2000 days from the initial nova outburst.