[en] Context: Being part of the brightest solar-like stars, and close solar analogues, the 16 Cygni system is of great interest to the scientific community and may provide insight into the past and future evolution of our Sun. It has been observed thoroughly by the Kepler satellite, which provided us with data of an unprecedented quality. Aims: This paper is the first of a series aiming to extensively characterise the system. We test several choices of micro- and macro-physics to highlight their effects on optimal stellar parameters and provide realistic stellar parameter ranges. Methods: We used a recently developed method, WhoSGlAd, that takes the utmost advantage of the whole oscillation spectrum of solar-like stars by simultaneously adjusting the acoustic glitches and the smoothly varying trend. For each choice of input physics, we computed models which account, at best, for a set of seismic indicators that are representative of the stellar structure and are as uncorrelated as possible. The search for optimal models was carried out through a Levenberg-Marquardt minimisation. First, we found individual optimal models for both stars. We then selected the best candidates to fit both stars while imposing a common age and composition. Results: We computed realistic ranges of stellar parameters for individual stars. We also provide two models of the system regarded as a whole. We were not able to build binary models with the whole set of choices of input physics considered for individual stars as our constraints seem too stringent. We may need to include additional parameters to the optimal model search or invoke non-standard physical processes.
Research Center/Unit :
Institut d’Astrophysique et Géophysique de l’Université de Liège LESIA, Observatoire de Paris Observatoire de Genève, Université de Genève PSL Research University CNRS Université Pierre et Marie Curie Université Paris Diderot
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Farnir, Martin ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Dupret, Marc-Antoine ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Buldgen, Gaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Salmon, Sébastien ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Noels-Grötsch, Arlette ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Pinçon, Charly ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Pezzotti, Camilla
Eggenberger, Patrick
Language :
English
Title :
Thorough characterisation of the 16 Cygni system. I. Forward seismic modelling with WhoSGlAd
Alternative titles :
[fr] Caractérisation exhaustive du système 16 Cygni. I. Modélisation "Forward" avec WhoSGlAd
Publication date :
2020
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
H2020 - 833925 - STAREX - STARs at the EXtreme
Name of the research project :
Thèse de doctorat : New seismic probing method for solar-type stars, red subgiants and g pulsators
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture F.R.S.-FNRS - Fonds de la Recherche Scientifique SNF - Schweizerischer Nationalfonds zur Förderung der wissenschaftlichen Forschung EU - European Union SNSF - Swiss National Science Foundation
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