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SUMMARY:Probing the Early Solar System with Comet
DTSTART;VALUE=DATE-TIME:20260715T060000Z
DTEND;VALUE=DATE-TIME:20260715T070000Z
DTSTAMP;VALUE=DATE-TIME:20260726T022900Z
UID:indico-event-5178@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Xian Shi（史弦） (SHAO)\n\nHost: Dong LaiJoin T
 encent Meeting：https://meeting.tencent.com/dm/2PzZ22fxWTqaMeeting ID: 1
 55276688 (no password）Abstract:Comets are among the most primitive remna
 nts of Solar System formation and preserve invaluable records of the physi
 cal and chemical conditions in the early Solar System. Over the past decad
 es\, advances in spacecraft exploration and ground-based observations have
  transformed our understanding of cometary nuclei and their evolution. In 
 this talk\, I will review recent progress in comet science\, highlighting 
 key discoveries from ESA's Rosetta mission—the first mission to escort a
  comet through its perihelion passage. Analysis of Rosetta observations ha
 s revealed the remarkable diversity of cometary activity and the complex m
 echanisms driving dust ejection and surface evolution. Building on these i
 nsights\, I will present recent advances in AI-enabled thermophysical mode
 ling of cometary nuclei. Combining deep learning with decades of SOHO/SWAN
  water production measurements\, we derived nucleus sizes for a large samp
 le of comets. The results suggest that long-period comets are systematical
 ly larger than previously inferred\, leading to an Oort Cloud-to-Scattered
  Disk population ratio approaching 103\, far exceeding predictions of clas
 sical giant-planet migration models. Together with recent studies of stell
 ar flybys in the Sun's birth cluster\, these findings point to a more dyna
 mically active early Solar System and illustrate how spacecraft exploratio
 n\, long-term observations\, and artificial intelligence are reshaping our
  understanding of planetary system formation.Biography:Dr. Xian Shi (Shang
 hai Astronomical Observatory\, CAS) received her Ph.D. from the Shanghai A
 stronomical Observatory in 2012. From 2012 to 2021\, she conducted postdoc
 toral research at DLR and MPS\, Germany. In 2021\, she joined the Shanghai
  Astronomical Observatory and established the research group "Exploration 
 and Investigation of Solar System's Small Bodies". Her research focuses on
  the origin and evolution of small bodies in the Solar System\, as well as
  the scientific analysis of space exploration missions. In recognition of 
 her contributions to understanding the mechanisms of cometary activity\, a
 steroid (33288) Shixian was named in her honor.\n\nhttps://indico-tdli.sjt
 u.edu.cn/event/5178/
LOCATION:Tsung-Dao Lee Institute/S4F-SW - Open Area (Tsung-Dao Lee Institu
 te)
URL:https://indico-tdli.sjtu.edu.cn/event/5178/
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