SEMINÁRIO DO DEPARTAMENTO DE ASTRONOMIA
The first year of North-PHASE: Periodicity, Hot spots, Accretion Stability and Early evolution of young stellar clusters
a talk by Ferdinand Hollauf and Ernesto Giulio M. Rando (University of Dundee, Scotland)
Abstract:
Young stellar objects (YSOs) are variable due to the multiple processes happening in their inner regions dictating the system's evolution. In this talk we present the first year results of the 5-year North - PHASE Legacy Survey, which investigates stellar variability on timescales from days to years for thousands of young stars. The survey tracks six young clusters using the JAST80 telescope from the Javalambre Observatory in Spain. We focus on three of these clusters: Trumpler 37, IC 348 and NGC 1333. Through our analysis we unveil the structures and processes in their YSOs at the scales relevant to inner planet formation, while also studying the connection between stars in the region independently of astrometry.
Within our fields, we find 4421 variable objects, with 1353 displaying periodic variability. Additionally, we revisit cluster membership, finding 495 new variable objects consistent with the clusters in both age and distance.
Across all three clusters we find that accreting stars rotate slower than non-accreting objects, and that the same proportion of accreting and non-accreting stars are periodic. This indicates that accretion could be less stochastic than previously established.
Statistically examining the star-disk connection is central to solving open questions on the formation of our Solar System and the feasibility of habitable planets. This underscores the necessity of time-resolved variability studies that can unpack the inner workings of protoplanetary disks and their hosts.
Short-Bio:
Ferdinand:
Ferdinand Hollauf is a 2nd PhD student at the University of Dundee, Scotland since January 2024. He did his Masters of Physics with Astronomy at the University of Southampton (UK). As part of the North-PHASE collaboration, his research interests include the study of young stars more specifically studying stellar variability to explain accretion, disk evolution and the history of star formation. His current research is on the multi cadence study of the variable stars in the young cluster Trumpler 37.
Ernesto:
Ernesto Giulio Mustienes Rando is a first-year PhD student at the University of Dundee, where he also completed his Bachelor's and Master's in Physics and Astrophysics. He is currently part of the North-PHASE variability survey, focusing on the Perseus star-forming region.
His interest within astronomy is star formation, ranging from the evolution of individual accreting inner disks, to large-scale star formation episodes that span entire molecular clouds.
His current research focuses on star-formation in clusters within the stellar neighbourhood, specifically using stellar variability as a way of characterising the processes that guide the evolution of young stars.
Google Meet: https://meet.google.com/pcw-gmem-jyi
Link da transmissão: https://www.youtube.com/c/AstronomiaIAGUSP/live