Descrizione del progetto
Dalle stelle supermassicce alle onde gravitazionali
Le onde gravitazionali sono cambiamenti invisibili nella curvatura dello spazio-tempo, paragonabili a increspature in un laghetto, provocate da alcuni degli eventi più violenti ed energici che si verificano nel nostro universo. Esse sono create dalla fusione di due buchi neri, a loro volta creati dal collasso di stelle massicce alla fine del proprio ciclo vitale. Con il sostegno del programma di azioni Marie Skłodowska-Curie, il progetto PROGENITOR sta effettuando la profilazione delle più massicce ed estremamente rare stelle di cui siamo a conoscenza, che si trovano in uno stadio avanzato della loro evoluzione e stanno perdendo massa a una velocità molto elevata. Gli studi svolti consentiranno di migliorare la comprensione in merito all’evoluzione delle stelle massicce e alle lontane origini delle onde gravitazionali.
Obiettivo
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.
Campo scientifico
Programma(i)
Argomento(i)
Meccanismo di finanziamento
MSCA-IF-EF-ST - Standard EFCoordinatore
1012WX Amsterdam
Paesi Bassi