中国科学院云南天文台特邀学术报告

YNAO Colloquium 2026

第17期

报告题目：Searching for Wandering Worlds -- Discovering Isolated Black Holes and Free-Floating Planets with Microlensing

主讲人：东苏勃 教授

报告人单位：北京大学

报告语言：中文/英文

报告时间：2026年11月13日（星期五）10:30-12:00

报告地点：科研7号楼2楼阶梯教室

主持人：陈雪飞

腾讯会议号：681-855-175

温馨提示：本期特邀报告的时间安排在星期五，请大家留意。

报告摘要：

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Galactic microlensing is the only known method for detecting dark objects ranging from isolated stellar-mass black holes (BHs) to low-mass free-floating planets (FFPs). Our success in the interferometric resolution of microlensed images with the VLTI has opened a new avenue for identifying isolated stellar remnants. I will discuss how VLTI-GRAVITY+ can potentially discover a large sample of BHs and uncover their distribution. Ground-based surveys have identified roughly a dozen short-timescale microlensing events, suggesting that FFPs may be a few times more common than planets bound to stars. Through joint observations from the ground and the Gaia satellite, we recently achieved the first lens mass measurement of an FFP event, finding a Saturn-mass planet. I will discuss how future space-based surveys can advance our understanding of the emerging FFP population.

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报告人简介：

Professor Subo Dong works in the Department of Astronomy, School of Physics, at Peking University. He obtained B.Sc. in Astronomy from Nanjing University in 2004 and Ph.D. in Astronomy from The Ohio State University in 2009. After conducting postdoctoral research at the Institute for Advanced Study in Princeton, he joined the faculty at Peking University in 2013. He is currently interested in searching for exoplanets and black holes with microlensing, studying the distribution and dynamical evolution of exoplanets, and understanding how supernovae explode.

主办：中国科学院云南天文台学术委员会

联系人：柳正伟