BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Explosive transients\, their origins and their use to study the hi gh-redshift Universe DTSTART:20220519T143000Z DTEND:20220519T160000Z DTSTAMP:20260903T075739Z UID:325da54c-9dd5-4d94-baa9-aaad7f9dd928 SEQUENCE:1 CREATED:20220516T094756Z DESCRIPTION: Abstract:Explosive transients are usually connected to massiv e stars\, directly or indirectly. Some of the most luminous of those explo sions are gamma-ray bursts (GRBs) and superluminous supernovae (SLSNe). GR Bs come in two different classes\, long GRBs whose progenitors are massive stars with low metallicity and high rotation rate\, and short GRBs\, the merger of two compact objects and one of the known sources of gravitationa l wave signals. Type I SLSNe (without H in their spectra) were first thoug ht to have progenitors similar to long GRBs\, but studies of the host gala xies have suggested more extreme stars for those events. Due to their rare numbers and the fact that they are hosted mostly in dwarf galaxies we wil l likely not be able to observe the progenitor systems of any of these eve nts before explosion in the near future. In this talk I will review what w e know about the progenitors of different stellar explosions and how we us e the host galaxy and environment to get indirect information on the proge nitor\, in particular using 3D spectroscopy. One important aspect is where the star-formation originates giving rise to the progenitors and I will f ocus on a peculiar\, nearby\, host galaxy where we have multi-wavelength d ata to study possible star-formation processes. I will also present how we can use in particular GRBs to study the ISM in high-redshift galaxies wit h absorption lines in the afterglow spectrum and present the first metalli city measurement of a short GRB host. Finally\, I will review how and if w e might be able to use these explosions to test the expansion of the Unive rse. LAST-MODIFIED:20220516T094756Z LOCATION:Sala de Seminários do DF\, Pavilhão de Física\, 2º piso URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/explosive-transients-their -origins-and-their-use-to-study-the-high-redshift-universe/ X-ALT-DESC;FMTTYPE=text/html:

Abstract:
Expl osive transients are usually connected to massive stars\, directly or indi rectly. Some of the most luminous of those explosions are gamma-ray bursts (GRBs) and superluminous supernovae (SLSNe). GRBs come in two different c lasses\, long GRBs whose progenitors are massive stars with low metallicit y and high rotation rate\, and short GRBs\, the merger of two compact obje cts and one of the known sources of gravitational wave signals. Type I SLS Ne (without H in their spectra) were first thought to have progenitors sim ilar to long GRBs\, but studies of the host galaxies have suggested more e xtreme stars for those events. Due to their rare numbers and the fact that they are hosted mostly in dwarf galaxies we will likely not be able to ob serve the progenitor systems of any of these events before explosion in th e near future. In this talk I will review what we know about the progenito rs of different stellar explosions and how we use the host galaxy and envi ronment to get indirect information on the progenitor\, in particular usin g 3D spectroscopy. One important aspect is where the star-formation origin ates giving rise to the progenitors and I will focus on a peculiar\, nearb y\, host galaxy where we have multi-wavelength data to study possible star -formation processes. I will also present how we can use in particular GRB s to study the ISM in high-redshift galaxies with absorption lines in the afterglow spectrum and present the first metallicity measurement of a shor t GRB host. Finally\, I will review how and if we might be able to use the se explosions to test the expansion of the Universe.

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