Stellar age is the central desirable parameter we need to disentangle different Galactic formation scenarios. Nevertheless, no stellar age dating method is completely model-independent. Even in the best-case scenarios, present-day stellar age estimates are only precise to $\sim7\%$ and accurate to $\sim10-15\%$. A main drawback of state-of-the-art stellar parameter inference codes like {\tt StarHorse} is that they do not take into account unresolved stellar multiplicity. Especially in the case of nearly equal-mass binaries or higher-order systems on the main sequence, properly taking into account unresolved multiplicity is imperative for the next generation of stellar surveys. Simulation-based inference (SBI) is a robust and flexible approach for dealing with complex models where traditional likelihood-based methods become unfeasible. Here we sketch how SBI can be used to obtain precise stellar ages, masses, binary mass ratios, and other stellar parameters from spectroscopic, photometric, and astrometric measurements.
JWST has revealed rapid nitrogen enrichment in high redshift galaxies, renewing the need for stellar yields that follow metal free stars beyond the main sequence and across their final fates. We present Geneva stellar evolution models of rapidly rotating Pop~III stars with $5 \leq M_{\rm ini}/M_\odot \leq 200$ and $\up...
D. Nandal, Konstantinos Topalakis, V. Sergienko et al.· 0 citations
Bayesian inference has become a standard tool for inferring stellar parameters from stellar evolution models. However, comparatively little attention has been paid to how alternative Bayesian likelihood formulations influence inferred stellar parameters, and the resulting evolutionary mass discrepancy for massive main...
C. I. Eze, G. Handler, M. Vanrespaille et al.· 0 citations
Accurate stellar parameters underpin much of modern astrophysics, from the characterisation of exoplanetary systems to Galactic archaeology. For isolated field stars, masses and especially ages are most often inferred by comparing observed properties against stellar evolution models, yet these inferences depend on the...
J. Vines, A. Ware· Astronomy & Astrophysics· 0 citations
Stellar age is fundamental for reconstructing planetary-system evolution but remains difficult to determine for unevolved main-sequence stars. Stellar rotation provides a sensitive age diagnostic and a temporal framework for investigating the evolution of close-in planets. This is the first paper in a series aimed at t...
A. Lanzafame, V. Drago, N. Greco et al.· 0 citations
Stellar multiplicity at different orbital periods is probed by different techniques: radial velocities at the shortest periods, direct imaging at the longest, and astrometry in between. DR3 provides unprecedented astrometric information to constrain binary populations with periods of tens to thousands of days. Beyond t...
B. Pennell, H. Rix, K. El-Badry et al.· Astronomy & Astrophysics· 0 citations
Measuring M dwarf ages is a central challenge in stellar astrophysics. These stars evolve so slowly that isochrone fitting gives little constraint, requiring alternative methods based on rotation, activity, and kinematics. Reliable ages help constrain the formation and evolution of planetary systems around M dwarfs, in...
L. Sairam, N. Madhusudhan· 0 citations
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