5555243
doi
10.5281/zenodo.5555243
oai:zenodo.org:5555243
user-plato2021
Basu, Sarbani
Yale University
McKeever, Jean
Yale University
Roxburgh, Ian
QMUL; Birmingham
Lund, Mikkel N.
Aarhus University
Bieryla, Allyson
CfA/Harvard
Viani, Lucas S.
Yale University
Latham, David W.
CfA/Harvard
Mixed Modes and the Asteroseismic Surface Term
Ong, Joel J. M.
Yale University
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
asteroseismology
perturbation theory
<p>We present new methodological developments regarding the treatment of the asteroseismic surface term in stars with mixed modes. Models of solar-like oscillators yield acoustic modes at different frequencies than would be seen in actual stars possessing identical interior structure, due to modelling error near the surface. This asteroseismic ``surface term'' must be corrected when mode frequencies are used to infer stellar structure. This is typically done by way of likelihood functions intended to diagnose whether or not differences between two sets of mode frequencies are consistent with a structural perturbation localised to the stellar surface. Different choices of these prescriptions modify the posterior distributions of fundamental stellar properties — such as the mass, radius, and age — inferred from individual stars using asteroseismology. These in turn induce population-level systematic biases. Existing prescriptions developed for p-modes are also not immediately applicable to the mixed modes seen in more evolved solar-like oscillators. We examine some outstanding issues in how the surface term is currently treated in stellar modelling with asteroseismology, and how these new methods may address these shortcomings, with a particular focus on the interaction between mode mixing and these systematic effects.</p>
Zenodo
2021-10-11
info:eu-repo/semantics/conferencePoster
5555242
user-plato2021
1633691951.464153
2228675
md5:b8c3faf2ae698c9c5bdbd35bd06cb952
https://zenodo.org/records/5555243/files/Poster.pdf
public
10.5281/zenodo.5555242
isVersionOf
doi