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PRObes of Gravitational-wave progENITORs

Projektbeschreibung

Von supermassereichen Sternen zu Gravitationswellen

Gravitationswellen sind unsichtbare Veränderungen in der Krümmung der Raumzeit – etwa wie Wellen in einem Teich –, die durch einige der gewaltigsten und energiereichsten Ereignisse in unserem Universum ausgelöst werden. Sie entstehen beim Verschmelzen zweier schwarzer Löcher, die ihrerseits durch den Kollaps massereicher Sterne am Ende ihrer Lebenszeit erzeugt werden. Das im Rahmen der Marie-Skłodowska-Curie-Maßnahmen unterstützte Projekt PROGENITOR erforscht die massereichsten und seltensten Sterne, die wir kennen: Wolf-Rayet-Sterne, die sich in einem fortgeschrittenen Entwicklungsstadium befinden und überaus schnell an Masse verlieren. Die Untersuchungen werden zu einem besseren Verständnis der Entwicklung massereicher Sterne und der fernen Ursprünge von Gravitationswellen beitragen.

Ziel

Stars initially ten times more massive than our Sun play a vital role in the evolution of the Cosmos. Their death is marked by the sudden collapse of their cores into neutron stars or black holes. Somehow, tight couples of massive black holes in the distant Universe occasionally merge, unleashing powerful gravitational waves that are now regularly being measured. The underlying processes that lead to the formation of these pairs remain shrouded in mystery, entailing an intricate story about the life cycle of their PROGENITORs -- the most massive and evolved stars. This reminded the astrophysical community of huge gaps in our knowledge of key processes governing massive-star evolution, related to binary interactions, mass-loss, and mixing. To mitigate this, we must obtain robust empirical constraints on the multiplicity, configuration, and stellar properties of the direct progenitors of black holes in regions that approach the conditions of the distant Universe: the Wolf-Rayet populations of the Magellanic Clouds. The MSCA fellowship offers an ideal platform for achieving this, relying on my unique skills, data, and tools in massive-star spectroscopy with training in state-of-the-art evolution models of stellar populations that I will receive at the University of Amsterdam. I will exploit brand new multi-epoch, multiwavelength monitoring spectroscopy obtained with the Hubble Space Telescope (HST) and Very Large Telescope (VLT). I will establish the physical and orbital properties of entire populations of Wolf-Rayet stars and binaries in the Magellanic Clouds relying on state-off-the-art tools and novel analysis techniques. I will compute population-synthesis models to constrain the evolutionary paths of gravitational-wave mergers. Through this, I will push our understanding of massive stars and gravitational wave sources throughout the Cosmos to new frontiers.

Koordinator

UNIVERSITEIT VAN AMSTERDAM
Netto-EU-Beitrag
€ 175 572,48
Adresse
SPUI 21
1012WX Amsterdam
Niederlande

Auf der Karte ansehen

Region
West-Nederland Noord-Holland Groot-Amsterdam
Aktivitätstyp
Higher or Secondary Education Establishments
Links
Gesamtkosten
€ 175 572,48