Article (Scientific journals)
Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
Paxton, Bill; Smolec, R.; Schwab, Josiah et al.
2019In Astrophysical Journal Supplement Series
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Keywords :
Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] We update the capabilities of the open-knowledge software instrument Modules for Experiments in Stellar Astrophysics (MESA). RSP is a new functionality in MESAstar that models the non-linear radial stellar pulsations that characterize RR Lyrae, Cepheids, and other classes of variable stars. We significantly enhance numerical energy conservation capabilities, including during mass changes. For example, this enables calculations through the He flash that conserve energy to better than 0.001 %. To improve the modeling of rotating stars in MESA, we introduce a new approach to modifying the pressure and temperature equations of stellar structure, and a formulation of the projection effects of gravity darkening. A new scheme for tracking convective boundaries yields reliable values of the convective-core mass, and allows the natural emergence of adiabatic semiconvection regions during both core hydrogen- and helium-burning phases. We quantify the parallel performance of MESA on current generation multicore architectures and demonstrate improvements in the computational efficiency of radiative levitation. We report updates to the equation of state and nuclear reaction physics modules. We briefly discuss the current treatment of fallback in core-collapse supernova models and the thermodynamic evolution of supernova explosions. We close by discussing the new MESA Testhub software infrastructure to enhance source-code development.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Paxton, Bill
Smolec, R.
Schwab, Josiah
Gautschy, A.
Bildsten, Lars
Cantiello, Matteo
Dotter, Aaron
Farmer, R.
Goldberg, Jared A.
Jermyn, Adam S.
Kanbur, S. M.
Marchant, Pablo
Thoul, Anne  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Townsend, Richard H. D.
Wolf, William M.
Zhang, Michael
Timmes, F. X.
More authors (7 more) Less
Language :
English
Title :
Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
Publication date :
01 March 2019
Journal title :
Astrophysical Journal Supplement Series
ISSN :
0067-0049
eISSN :
1538-4365
Publisher :
University of Chicago Press, United States - Illinois
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
57 pages, 57 figures; Accepted to ApJS
Available on ORBi :
since 02 July 2019

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