Descripción del proyecto
De las estrellas supermasivas a las ondas gravitacionales
Las ondas gravitacionales son cambios invisibles en la curvatura del espacio-tiempo, como ondulaciones en un estanque causadas por algunos de los acontecimientos más violentos y energéticos del universo. Se crean por la fusión de dos agujeros negros que, a su vez, surgen por el colapso de estrellas masivas al final de su vida. Con el apoyo de las Acciones Marie Skłodowska-Curie, el equipo del proyecto PROGENITOR está elaborando perfiles de las estrellas más masivas y raras que conocemos, las estrellas Wolf-Rayet, que se encuentran en una fase avanzada de evolución y pierden masa a un ritmo muy elevado. Los estudios permitirán comprender mejor la evolución de las estrellas masivas y los orígenes lejanos de las ondas gravitacionales.
Objetivo
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.
Ámbito científico
Programa(s)
Régimen de financiación
MSCA-IF-EF-ST - Standard EFCoordinador
1012WX Amsterdam
Países Bajos