Special Session SS34  4 July 2024

Transient hosts in the 2020ies

Aims and scope

The advent of large-scale optical surveys in the past few years has largely increased the number of discovered transients. Satellites provide triggers for high energy transients and gravitational wave detectors pinpoint compact object mergers. The main classes of these astrophysical transients include Gamma-ray bursts, discovered by their emission in gamma rays, supernovae, detected mainly at optical wavelengths, and fast radio bursts, milli-second pulses detected in radio surveys. New sub-classes are identified frequently implying different progenitor stars as well as properties of their circumstellar medium.

A deeper understanding of the physical properties of these transients is often hard to achieve by direct observations. Hence, it is vital to study the galaxies hosting these catastrophic explosions, in particular their immediate environments. State-of-the art IFUs, multi-object spectrographs and high-resolution facilities allow studying the spatially resolved properties of the gas and the stellar populations, which has pushed forward our understanding of the progenitors of different transients types. In the next decade, new 30m-class telescopes will allow much more accurate characterization, the extension to the IR by JWST and other facilities will soon allow tracing these studies back to much higher redshifts.

This meeting wants to address some of the important questions concerning transient progenitors and what we can learn from their hosts while we venture into a highly prolific era of transient research: Is there a metallicity threshold for super-luminous supernovae and gamma-ray burst stellar progenitors? And how does this reflect on the properties of their immediate environments? Are the physical properties of the cold gas, measured during a GRB or a core-collapse SN explosion, similar to the properties of the star-forming regions where they were born? Do some of these transient share common or very similar progenitors? And why are some energetic transients showing large offsets to their host galaxies? What is the role of galaxy mass and/or star-formation rate in type-Ia SN luminosity relation?

Now, at the dawn of the transient machine, the LSST/VRO survey, and new large projects like JWST, large-scale spectroscopic surveys such as 4MOST and WEAVE, and multi-wavelength facilities like ALMA, SKA and VLA it is timely to bring together experts on transient explosions and their host galaxies. We will present our latest results to the community, discuss synergies with related fields, especially those related to 3D studies of galaxies, and to coordinate goals for the near future. Discussing follow-up and monitoring strategies for LSST and other transient surveys, and the synergies with other time-domain fields, will also be an important focus.


  • Large-scale spectroscopic surveys
  • Integral-field observation of the immediate environment
  • Multi-wavelength view of transient host-galaxies
  • Exotic transients and their hosts: from kilonovae to Ca-rich supernovae
  • Type-Ia supernovae, their host properties and the Hubble tension
  • Upcoming and future instrumentation for host and environmental studies

Invited speakers

  • Ragnhild Lunnan (Univ. of Stockholm)
  • Annalisa de Cia (ESO and Univ. of Geneva)
  • Joseph Lyman (Warwick Univ.)
  • Heloise Stevance (Univ. of Oxford)

Scientific organisers

Christina Thöne (chair)
Luca Izzo (co-chair)
Lise Christensen
Lluis Galbany
Kasper Elm Heinz
Giorgos Leloudas
Michal Michalowski
Patricia Schady
Steve Schulze


christina.thoene  @  gmail.com

Updated on Fri Mar 01 12:26:55 CET 2024