Probing the Circumstellar and Interstellar Medium with Transients and Multi-Wavelength Observations
26th to 29th October 2026
Waseda University, Tokyo, Japan
Understanding the multi-scale structure of baryonic matter, from circumstellar environments to the intergalactic medium, is a central challenge in galaxy evolution. The circumstellar, interstellar, and circumgalactic media (CSM, ISM, and CGM) are tightly interconnected across these scales, linking stellar processes to galaxy-wide gas reservoirs and beyond.
Transient phenomena such as supernovae (SNe), gamma-ray bursts (GRBs) and fast radio bursts (FRBs) and quasars provide powerful probes of gas and dust along the line of sight. Early-time SNe observations trace the CSM, while GRB afterglows probe the ISM of their host galaxies. FRBs and quasar spectroscopy extends these studies to ISM, CGM, and intergalactic medium (IGM) scales. Quasars also allow to access compact regions via broad absorption line (BAL) features. Complementary to these line-of-sight probes, multi-wavelength observations with facilities such as JWST, ALMA, NOEMA, PFS, and SKA provide both global and spatially resolved views of gas, dust, and stellar populations. These approaches offer a broader context in which to interpret the localized information obtained from transient-based measurements.
Despite these advances, a coherent and unified multi-scale framework linking CSM/ISM and CGM/IGM studies remains lacking. Bridging this gap is essential for understanding dust evolution, feedback processes, and for assessing how representative transient sightlines are of global galaxy properties. With present and next-generation facilities, the time is ripe to advance this synergy.
This workshop will bring together the transient and galaxy/ISM communities to develop a coherent, multi-scale view of baryonic structures across cosmic time. Dedicated discussion sessions will be included to foster interaction and to stimulate future collaborations, particularly between Japanese and French teams.
Researchers in astrophysics working on transients, galaxy evolution, ISM/CGM studies, spectroscopy, and multi-wavelength observations, including early-career and senior scientists.
The detailed programme will be made available at a later stage.
The workshop will take place at
Waseda University in Tokyo, Japan.
Travel and accommodation recommendations will be provided here in due course.
An attendance limit of about 26 participants is expected and we hope that all attendees will present a talk.
Please fill in the registration form below: