科学研究
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2023.12.18
Electromagnetic fireworks from erupting magnetars
Highly magnetized neutron stars are a source of extreme transients observed in different bands, like the fast radio burst (FRB) and associated hard X-ray burst from the Galactic magnetar SGR 1935+2154. The origin of such outbursts, hard X-rays on the one hand and millisecond duration FRBs on the other hand, is still unknown. We present a global model for various kinds of such magnetar outbursti...
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2023.12.18
Probing Parity with Galaxy Distributions and Beyond
Galaxies' four-point correlation functions provide insights into parity symmetry at cosmological scales. In this talk, I will present our data analysis on the BOSS galaxy sample with a focus on various observational effects. I will also discuss some future aspects of extending the analysis, including models and connection with other observables. In addition, I will also discuss an alternative i...
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2023.11.27
Multi-Messenger Probes on Dark Matter Beyond WIMPs
We will discuss two promising dark matter scenarios: axion-like particle dark matter and primordial black hole dark matter. We begin with radio telescope probes on axion-like dark matter. We will discuss the axion-photon conversion around neutron stars which results in the radio emission and the 21 cm probes through the effects on large scale structure formation suppression. We then turn our at...
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2023.11.24
Tidal Disruption Events: Probes of Accretion Physics and Black Hole Demographics
Tidal disruption events (TDEs) provide unique laboratories to study the demographics, immediate stellar and gaseous environments, and accretion physics of the massive black hole population. Over the past few years, time domain sky surveys such as the optical Zwicky Transient Facility (ZTF) have led to a surge of TDE discoveries in galaxy centers. This talk highlights our efforts to constrain th...
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2023.11.21
High contrast imaging science with coronagraphic instruments
While high-contrast imaging surveys in the past decade have produced only a handful of self-luminous exoplanets, they opened new gates for studying the forming environments of planetary systems. With multi-epoch and multi-wavelength imaging, I will talk about our ongoing efforts on scientific expeditions using current flagship observatories. They include (1) pinpointing the orbits of hidden pla...
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