Chemical evolution of protoplanetary disks: the effect of dust evolution

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K13967
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 16010:Astronomy-related
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: Kenji Furuya 国立天文台, 科学研究部, 特任助教 (80783711)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 星間化学 / 原始惑星系円盤

Outline of Final Research Achievements

The aim of this study was to elucidate the chemical evolution of protoplanetary disks during the coalescence and growth evolution of dust. As specific results, we developed a model that consistently solves for dust precipitation in protoplanetary disks, gas and dust agitation effects due to turbulence, and gas- and solid-phase chemical reactions. The results show that the disk gas becomes relatively nitrogen-rich relative to oxygen and carbon on a timescale of about a million years, and that the observed high C/O ratio of the disk gas is not achieved by gas and dust transport and chemical reactions alone.

Free Research Field

星間化学、星惑星系形成

Academic Significance and Societal Importance of the Research Achievements

本研究では、原始惑星系円盤の元素組成が場所ごとに時間変化し、星間空間の元素組成とは大きく異なりうることを理論的に示した。このことは惑星の材料物質の元素組成が多様であり、かつ時間変化することを意味しており、惑星組成の理解が単純ではないことを示唆している。また本研究で構築した理論モデルはALMAなどによる原始惑星系円盤の分子輝線観測の解釈においても有用である。