The SAPP pipeline for the determination of stellar abundances and atmospheric parameters of stars in the core program of the PLATO mission - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2022

The SAPP pipeline for the determination of stellar abundances and atmospheric parameters of stars in the core program of the PLATO mission

Maria Bergemann
  • Function : Author
Aldo Serenelli
  • Function : Author
Luca Casagrande
  • Function : Author
Jeffrey M. Gerber
  • Function : Author
Ulrike Heiter
  • Function : Author
Mikhail Kovalev
  • Function : Author
Thierry Morel
Nicolas Nardetto
Vardan Adibekyan
Víctor Silva Aguirre
  • Function : Author
Martin Asplund
  • Function : Author
Carlos del Burgo
  • Function : Author
Lionel Bigot
  • Function : Author
  • PersonId : 830491
Andrea Chiavassa
  • Function : Author
Jonay I. González Hernández
  • Function : Author
Denis Mourard
Thibault Merle
  • Function : Author
Szabolcs Mészáros
  • Function : Author
Douglas J. Marshall
  • Function : Author
Regner Trampedach
  • Function : Author
Maria Tsantaki
  • Function : Author

Abstract

We introduce the SAPP (Stellar Abundances and atmospheric Parameters Pipeline), the prototype of the code that will be used to determine parameters of stars observed within the core program of the PLATO space mission. The pipeline is based on the Bayesian inference and provides effective temperature, surface gravity, metallicity, chemical abundances, and luminosity. The code in its more general version can have a much wider range of applications. It can also provide masses, ages, and radii of stars and can be used for stars of stellar types not targeted by the PLATO core program, such as red giants. We validate the code on a set of 27 benchmark stars that includes 19 FGK-type dwarfs, 6 GK-type sub-giants, and 2 red giants. Our results suggest that combining various observables is the optimal approach, as it allows to break degeneracies between different parameters and yields more accurate values of stellar parameters and more realistic uncertainties. For the PLATO core sample, we obtain a typical uncertainty of 27(syst.) ± 37 (stat.) K for T eff , 0.00 ± 0.01 dex for log g, 0.02 ± 0.02 dex for metallicity [Fe/H], −0.01 ± 0.03 R for radii, −0.01 ± 0.05 M for stellar masses, and −0.14 ± 0.63 Gyrs for ages. We also show that the best results are obtained by combining the ν max scaling relation and stellar spectra. This resolves the notorious problem of degeneracies, which is particularly important for F-type stars.
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Dates and versions

hal-03440305 , version 1 (22-11-2021)

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Matthew Raymond Gent, Maria Bergemann, Aldo Serenelli, Luca Casagrande, Jeffrey M. Gerber, et al.. The SAPP pipeline for the determination of stellar abundances and atmospheric parameters of stars in the core program of the PLATO mission. Astronomy and Astrophysics - A&A, 2022, 658, pp.A147. ⟨10.1051/0004-6361/202140863⟩. ⟨hal-03440305⟩
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