The Astronomy Weekly Seminar will be held as follows:

Title: 10th Anniversary of the Discovery of Gravitational Waves: Instrumental Improvements and Summary of Detected Events

Speaker: Prof. June Gyu Park (연세대학교)

Date & Time: December 5th (Fri.), 11:00 AM - 12:00 PM (KST)

Location: Science Hall B103

Abstract: The first direct detection of the gravitational-wave signal GW150914 marked the beginning of gravitational-wave astronomy, and 2025 is the 10th anniversary of this discovery. Over the past decade, the sensitivity of ground-based interferometric detectors has improved significantly through continuous instrumental upgrades. As a result, the observable distance of the detector network has increased from run to run. While only three events were detected during O1, by the end of the O4 observing run on 18 November 2025 a total of about 350 gravitational-wave events had been confirmed, and roughly 200 of them had been analyzed and included in published event catalogs. In this talk, I will review the instrumental development of ground-based gravitational-wave detectors over the last ten years, with a focus on key optical techniques, such as dual-recycling interferometer configurations and noise-mitigation schemes. I will also summarize the main classes of detected sources and discuss several representative events that characterize the first decade of gravitational-wave astronomy.

The talk will be delivered in English.

We look forward to seeing you all.