报告人：Wladimir Neumann（澳门科技大学 教授）

时间：2025年8月20日（周三） 10:00-11:30

地点：测绘馆401会议室

报告简介：

Accretion processes in protoplanetary disks create a variety of small bodies that contribute to planetary composition and can persist as asteroids or comets. These bodies likely played a key role in scattering events and the accretion of terrestrial planets. However, their early evolution remains poorly understood, particularly regarding the timescales of accretion and thermal processes at various heliocentric distances.

Recent findings from meteorite studies and space missions like JAXA’s Hayabusa2 and NASA’s OSIRIS-REx have revealed that near-Earth asteroids such as Ryugu and Bennu are rubble-pile objects composed of hydrated materials, spectrally similar to carbonaceous chondrites. Isotopic anomalies suggest a dichotomy between non-carbonaceous and carbonaceous meteorites, formed in distinct regions of the early solar system. These findings, combined with precise chronology of meteorites and asteroids, offer insights into early solar system dynamics, such as Jupiter’s growth and the delivery of volatile species to Earth. Upcoming sample analyses from these missions will further advance our understanding of these cosmochemical processes.

报告人简介：

Prof. Dr. Wladimir Neumann is a planetary scientist at the department Planetary Geodesy of the Technical University (TU) Berlin and a Distinguished Professor at the State Key Laboratory of Lunar and Planetary Sciences at the Macau University of Science and Technology. His scientific work focuses on the orbit integration and determination, thermal evolution and differentiation of planetesimals, asteroids, dwarf planets, and icy moons, and on the accretion timescale of planetary objects in the early solar system. Within this research, he contributed to the scientific interpretation of the observations made by the space missions Dawn (NASA) and Hayabusa2 (JAXA) as an instrument Co-I and is involved with the ESA planetary defence mission Hera and the ESA mission Juice to the Jupiter system as science team member.