[P-CG20] 宇宙における物質の形成と進化

[PCG20-02] Ice Chemistry in the Era of JWST

★Invited Papers

*Yao-Lun Yang¹、Joel Green²、Klaus Pontoppidan²、Jennifer Bergner³、Ilse Cleeves⁴、Neal Evans⁵、Robin Garrod⁴、Mihwa Jin⁶、Chul Hwan Kim⁷、Jaeyeong Kim⁸、Jeong-Eun Lee⁷、Yuki Okoda¹、Nami Sakai¹、Colette Salyk⁹、Chris Shingledecker¹⁰、Brielle Shope⁴、John Tobin¹¹、Ewine van Dishoeck^12,13 (1.RIKEN、2.STScI、3.Berkeley、4.UVA、5.UT-Austin、6.Goddard、7.SNU、8.KASI、9.Vassar、10.Benedictine、11.NRAO、12.Leiden、13.MPE)

キーワード：Astrochemistry, Interstellar Ice, Low-mass Star Formation, JWST

Ice plays a critical role in chemical evolution during star formation. Complex organic molecules, which have become frequently detected in Class 0/I protostars, form on ice mantles and desorb into gas phase when the temperature increases. However, the formation pathways of COMs and whether most protostars undergo similar chemical evolution remain open questions with little observational constraints. Most COMs form in the ice mantles covering dust grains. While ALMA provides sub-100 au resolution for studying gaseous COMs in nearby embedded protostars, measurements of the chemical composition in ices had been limited by low resolution and limited sensitivity until JWST, which can probe ices at a spatial scale comparable to that by ALMA with unprecedented sensitivity. In this talk, I will talk about the role of ice in the chemical evolution of star formation as well as the formation pathways of COMs. I will discuss the recent JWST results on ice in protostellar environments, especially focusing on the latest results of the CORINOS program, which aims to unveil the origin of gaseous COMs frequently detected in embedded protostars. I will also discuss the prospects of ice chemistry in the era of JWST.