BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Transients on the Edge DTSTART:20260115T143000Z DTEND:20260115T160000Z DTSTAMP:20260617T220817Z UID:72642632-fc25-441d-bab0-e1427aabb72e SEQUENCE:2 CREATED:20260113T132553Z DESCRIPTION:Astrophysical transients — temporary fireworks illuminating the Universe — are unique tools that allow us to study physics on all sc ales. This year\, two revolutionary feats of engineering will allow the st udy of transients like never before. The Vera Rubin Observatory'\;s Le gacy Survey of Space and Time (LSST) will soon be discovering hundreds of thousands of transients per year. To provide deeper insights on this giant dataset\, the Time Domain Extragalactic Survey (TiDES) will classify over 30\,000 transients and obtain spectra of a further 100\,000\, mapping tra nsient parameter space in exquisite detail. I am interested in two distinc t regions of this parameter space. Type Ia supernovae are the explosions o f white dwarf stars and\, due to their very uniform peak luminosities\, ha ve led the effort to measure distances and infer cosmological parameters f or the last 30 years. With modern surveys achieving increasingly precise m easurements of dark energy\, subtle correlations between the supernovae an d properties of their host galaxies threaten to limit this progress. I wil l show how LSST and TiDES will address and overcome these issues. Secondly \, I will discuss a relatively new\, puzzling type of transient: extremely long lived\, luminous flares from the centres of galaxies. These ambiguou s nuclear transients (ANTs) are too bright and have different spectra from regular tidal disruptions of stars by massive black holes\, but are equal ly unable to be explained by a standard steady-state active galactic nucle us. LSST will increase the sample of ANTs by an order of magnitude. I will highlight the excitement and challenges faced trying to understand what t hey are and their important role in galaxy evolution. LAST-MODIFIED:20260113T132602Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/transients-on-the-edge/ X-ALT-DESC;FMTTYPE=text/html:

Astrophysical trans ients — temporary fireworks illuminating the Universe — are unique too ls that allow us to study physics on all scales. This year\, two revolutio nary feats of engineering will allow the study of transients like never be fore. The Vera Rubin Observatory'\;s Legacy Survey of Space and Time ( LSST) will soon be discovering hundreds of thousands of transients per yea r.

To provide deeper insights on this giant dataset\, the Time D omain Extragalactic Survey (TiDES) will classify over 30\,000 transients a nd obtain spectra of a further 100\,000\, mapping transient parameter spac e in exquisite detail. I am interested in two distinct regions of this par ameter space. Type Ia supernovae are the explosions of white dwarf stars a nd\, due to their very uniform peak luminosities\, have led the effort to measure distances and infer cosmological parameters for the last 30 years.

With modern surveys achieving increasingly precise measurements of dark energy\, subtle correlations between the supernovae and propertie s of their host galaxies threaten to limit this progress. I will show how LSST and TiDES will address and overcome these issues. Secondly\, I will d iscuss a relatively new\, puzzling type of transient: extremely long lived \, luminous flares from the centres of galaxies. These ambiguous nuclear t ransients (ANTs) are too bright and have different spectra from regular ti dal disruptions of stars by massive black holes\, but are equally unable t o be explained by a standard steady-state active galactic nucleus. LSST wi ll increase the sample of ANTs by an order of magnitude. I will highlight the excitement and challenges faced trying to understand what they are and their important role in galaxy evolution.

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