English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In the context of CoRoT, Kepler, Gaia, TESS, and PLATO, precise and accuratestellar ages, masses and radii are of paramount importance. They are crucial toconstrain scenarii of planetary formation and evolution.We aim at quantifyinghow detailed stellar modeling improves the accuracy and precision on age andmass of individual stars. We adopt a multifaceted approach where we examine howthe number of observational constraints as well as the uncertainties onobservations and on model input physics impact the age-dating and weighing. Wemodelled the exoplanet host-star HD52265, a MS, solar-like oscillator observedby CoRoT. We considered different sets of observational constraints (HR data,metallicity, seismic constraints). For each case, we determined the age, mass,and properties of HD52265 inferred from models, and quantified the impact ofthe models inputs. Our seismic analysis provides an age A=2.10-2.54 Gyr, a massM=1.14-1.32 Msun, and a radius R=1.30-1.34 Rsun, which corresponds touncertainties of 10, 7, and 1.5% respectively. Our seismic study providesconstraints on surface convection, through the mixing-length found to be 12-15%smaller than the solar one. Because of helium-mass degeneracy, the initial Heabundance is determined modulo the mass. The seismic mass of the exoplanet isfound to be Mp sin i=1.17-1.26 MJup, much more precise than what can be derivedby HR diagram inversion. We demonstrate that asteroseismology allows to improvethe age accuracy compared to other methods. We emphasize that the knowledge ofthe mean properties of oscillations -as the large frequency separation- is notenough for deriving accurate ages. We need precise individual frequencies tonarrow the age scatter due to model uncertainties. This strengthen the case forprecise classical stellar parameters and frequencies as will be obtained byGaia and PLATO.

Asteroseismology for "\`{a} la carte" stellar age-dating and weighing: Age and mass of the CoRoT exoplanet host HD 52265