Title: Shining the light on the initial dust and gas composition of planet-forming disks

Speaker: Daniel Harsono

Institute: National TsingHua University (Taiwan)

Host: Siyi Feng

Time: 14:30-16:30, Thursday, December, 15

Location: Physics Building 552

Abstract:

Planet formation begins in the earliest stages of star formation. Observations of exoplanets have revealed a diverse range of populations in terms of mass and orbits. The key to understanding the observed diversity may lie in the star formation processes. During star and planet formation, the temperature of gas and dust varies from a few 10s of K to more than 1000 K. By tracing the chemical changes of the material from clouds to disks, we can build the physical structure of the planet-forming regions.

In the past few years, the Atacama Large Millimeter Array has been the working horse for unveiling the physical and chemical structure of planet-forming disks. Now, JWST has provided us with the solid ice composition and hot atomic lines from the warm inner regions of protostars. In this talk, I will present recent studies on the gas and dust composition of young disks and their implications on planet formation.  I will also discuss future challenges to overcome in star and planet formation.

Related papers:

https://ui.adsabs.harvard.edu/abs/2022Natur.606..272J/abstract

https://ui.adsabs.harvard.edu/abs/2022ApJ...924....5V/abstract

https://ui.adsabs.harvard.edu/abs/2021A%26A...655A..65T/abstract

Bio：

Daniel Harsono is an assistant professor at the National Tsing-Hua University (Taiwan). He received his PhD in 2014 from Leiden University. He worked on astrochemistry, disk formation, planet formation, and the origin of the Solar System during his PhD and Postdoctoral years. He was the East Asia Core Observatories Association Fellow from 2019 to 2021. His main research now is on the initial stages of planet formation and the origin of complex organic molecules using both ALMA and JWST.