Description
A seminar given at the Instituto de Astronomia, Geofísica e Ciências Atmosféricas at Universidade de São Paulo.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.
| Period | 22 Aug 2025 |
|---|---|
| Held at | Universidade de São Paulo, Brazil |
Keywords
- star formation
- STAR-MELT
- variability
- accretion
- optical
- multi-wavelength
- multi-cadence
- star clusters