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A01 Chemical evolution in formation sites of planetary systems probed by high-sensitivity and high-resolution observations

In recent years, advanced observational instruments such as ALMA and JVLA have been put into operation, and the sensitivity and resolution of space observations using radio waves have been significantly improved. As a result, we are now able to clearly observe materials in the region where stars and planetary systems are being born.  Those Telescopes have provided us with a series of new images of the physical structure and chemical composition distribution in the vicinity of protostars, and even the chemical diversity of individual sources is now discovered. It now becomes an important research target to connect such studies in astronomy with the planetary science for understanding origin and rarity of our existence.  In this project, we will conduct multi-wavelength, high-sensitivity, high-resolution molecular emission-line observations of more than 100 protoplanetary disk-forming regions that can be statistically discussed, using the ALMA telescope and other instruments, to reveal the entire chemical diversity of protoplanetary disks and their origins. We will also reveal the chemical composition of objects in different environments, such as UV intensity and elemental composition ratio, along with their physical structures. Together with the knowledge of fundamental chemical-processes obtained as feedbacks from other groups in this transformative area, we will reveal the physical and chemical phenomena occurring in the site of protoplanetary-disk formation, and dramatically advance our understanding on the origin of the chemical diversity of protoplanetary disks. In parallel, we will carry out precise measurements of spectral line frequencies of organic molecules and their isotopomers which are necessary to promote observations.


A01 Project Group Leader:

Nami Sakai

RIKEN Cluster for Pioneering Research

Chief Scientist and Director of Star and Planet Formation Laboratory

坂井 南美
Nami Sakai


Group Leader, Observational, and Spectroscopic Experiments

渡邉 祥正
Yoshimasa Watanabe

Shibaura Inst. Tech.

Observations and spectroscopic measurements of solar-type protostellar disks/near-by galaxies

酒井 剛
Takeshi Sakai

University of Elactro-Communications

Massive star observation and broadband receiver development

大屋 瑶子
Yoko Oya

Kyoto University

Observation of solar-type protostellar disks

山本 智
Satoshi Yamamoto

The Graduate University for Advanced Studies

Chemical Process Interpretation, Molecular Spectroscopy Data Analysis

下西 隆
Takashi Shimonishi

Niigata University

Infrared ice observation and observation of protostellar disks in nearby galaxies

廣田 朋也
Tomoya Hirota

National Astronomical Observatory of Japan

Observation of massive stellar disks

小山 貴裕
Takahiro Oyama


楊 燿綸
Yang Yao-Lun


百瀬 宗武
Munetake Momose

Ibaraki University

[The 2nd Public Research Leader]

飯野 孝浩
Takahiro Iino

University of Tokyo

[The 1st Public Research Leader]
"Creation of an interdisciplinary research field of planetary atmospheric and interstellar chemistry using isotope fractionation process chemistry as a common language"

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