Publications de Saniya Khan | EPFL Graph Search

Inferring the efficiency of convective-envelope overshooting in red giant branch stars

The understanding of mixing processes in stars is crucial to improving our knowledge of the chemical abundances in stellar photospheres and their variation with evolutionary phase. This is fundamental for many astrophysical issues on all scales, ranging fr ...

2025

VELOcities of CEpheids (VELOCE): I. High-precision radial velocities of Cepheids

Henryka Ewa Netzel, Saniya Khan, Vivien François Bonvin, Shreeya Sushil Shetye

We present the first data release of VELOcities of CEpheids (VELOCE), dedicated to measuring the high-precision radial velocities (RVs) of Galactic classical Cepheids (henceforth, Cepheids). The first data release (VELOCE DR1) comprises 18 225 RV measureme ...

2024

The Combined Effects of Vertical and Horizontal Shear Instabilities in Stellar Radiative Zones

Saniya Khan

Shear instabilities can be the source of significant amounts of turbulent mixing in stellar radiative zones. Past attempts at modeling their effects (either theoretically or using numerical simulations) have focused on idealized geometries, where the shear ...

Iop Publishing Ltd2024

Asteroseismic modelling strategies in the PLATO era I. Mean density inversions and direct treatment of the seismic information

Saniya Khan

Context. Asteroseismology experienced a breakthrough in the last two decades thanks to the so-called photometry revolution with space-based missions such as CoRoT, Kepler, and TESS. Because asteroseismic modelling will be part of the pipeline of the future ...

2023

The evolution of the Milky Way's thin disc radial metallicity gradient with K2 asteroseismic ages

Saniya Khan

The radial metallicity distribution of the Milky Way's disc is an important observational constraint for models of the formation and evolution of our Galaxy. It informs our understanding of the chemical enrichment of the Galactic disc and the dynamical pro ...

Oxford Univ Press2023

Investigating Gaia EDR3 parallax systematics using asteroseismology of Cool Giant Stars observed by Kepler, K2, and TESS

Richard Irving Anderson, Saniya Khan

Gaia EDR3 has provided unprecedented data that has generated a great deal of interest in the astrophysical community, even though systematics affect the reported parallaxes at the level of similar to 10 mu as. Independent distance measurements are availabl ...

2023

Kepler-93: A testbed for detailed seismic modelling and orbital evolution of super-Earths around solar-like stars

Saniya Khan

Context. The advent of space-based photometry missions such as CoRoT, Kepler and TESS has sparkled the rapid development of asteroseismology and its synergies with exoplanetology. In the near future, the advent of PLATO will further strengthen such multi-d ...

2022

Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G=18.5

Saniya Khan

We present a catalogue of 362 million stellar parameters, distances, and extinctions derived from Gaia's Early Data Release (EDR3) cross-matched with the photometric catalogues of Pan-STARRS1, SkyMapper, 2MASS, and All WISE. The higher precision of the Gai ...

2022