Science News内容：

　　题 目：Oscillations of Ultralight Dark Photon into Gravitational Waves

　　摘 要：Exploring stochastic gravitational wave backgrounds is a great new project, and the research the possibility that oscillations of ultralight Dark Photon gives a new mechanism to generate stochastic gravitational wave.

　　报告人：许明轩（紫台研究生）

Journal club内容：

　　题 目：Lens mass estimate in the Galactic disk extreme parallax microlensing event Gaia19dke

　　摘 要：Gaia19dke is an extraordinary microlensing event in the Cygnus constellation that was first spotted by the Gaia satellite. This event featured a strong microlensing parallax effect, which resulted in multiple peaks in the light curve. Extensive photometric, spectroscopic, and high-resolution imaging follow-up observations are conducted to determine the mass and the nature of the invisible lensing object. Using the Milky Way priors on density and velocity of lenses, and based on its low luminosity and mass, the authors propose that the lens in Gaia19dke event is an isolated white dwarf.

　　报告人：王琪茗（紫台研究生）

　　时 间：2023年12月19日星期二12:15

　　地 点：紫台3-302

欢迎大家参加！