Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions

Bill Paxton, Josiah Schwab, Evan B. Bauer, Lars Bildsten, Sergei Blinnikov, Paul Duffell, R. Farmer, Jared A. Goldberg, Pablo Marchant, Elena Sorokina, Anne Thoul, Richard H.D. Townsend, Francis Timmes

Research output: Contribution to journalArticle

133 Citations (Scopus)

Abstract

We update the capabilities of the software instrument Modules for Experiments in Stellar Astrophysics (MESA) and enhance its ease of use and availability. Our new approach to locating convective boundaries is consistent with the physics of convection, and yields reliable values of the convective-core mass during both hydrogen- and helium-burning phases. Stars with become white dwarfs and cool to the point where the electrons are degenerate and the ions are strongly coupled, a realm now available to study with MESA due to improved treatments of element diffusion, latent heat release, and blending of equations of state. Studies of the final fates of massive stars are extended in MESA by our addition of an approximate Riemann solver that captures shocks and conserves energy to high accuracy during dynamic epochs. We also introduce a 1D capability for modeling the effects of Rayleigh-Taylor instabilities that, in combination with the coupling to a public version of the radiation transfer instrument, creates new avenues for exploring Type II supernova properties. These capabilities are exhibited with exploratory models of pair-instability supernovae, pulsational pair-instability supernovae, and the formation of stellar-mass black holes. The applicability of MESA is now widened by the capability to import multidimensional hydrodynamic models into MESA. We close by introducing software modules for handling floating point exceptions and stellar model optimization, as well as four new software tools MESA- Web, MESA-Docker, pyMESA, and mesastar.org - to enhance MESA's education and research impact.

Original languageEnglish (US)
Article number34
JournalAstrophysical Journal, Supplement Series
Volume234
Issue number2
DOIs
StatePublished - Feb 1 2018

Fingerprint

astrophysics
massive stars
explosions
explosion
modules
experiment
supernovae
software
computer programs
stellar models
software development tools
Taylor instability
equation of state
latent heat
helium
import
stellar mass
floating
physics
availability

Keywords

  • convection
  • diffusion
  • hydrodynamics
  • methods: numerical
  • stars: evolution
  • supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Modules for Experiments in Stellar Astrophysics (MESA) : Convective Boundaries, Element Diffusion, and Massive Star Explosions. / Paxton, Bill; Schwab, Josiah; Bauer, Evan B.; Bildsten, Lars; Blinnikov, Sergei; Duffell, Paul; Farmer, R.; Goldberg, Jared A.; Marchant, Pablo; Sorokina, Elena; Thoul, Anne; Townsend, Richard H.D.; Timmes, Francis.

In: Astrophysical Journal, Supplement Series, Vol. 234, No. 2, 34, 01.02.2018.

Research output: Contribution to journalArticle

Paxton, B, Schwab, J, Bauer, EB, Bildsten, L, Blinnikov, S, Duffell, P, Farmer, R, Goldberg, JA, Marchant, P, Sorokina, E, Thoul, A, Townsend, RHD & Timmes, F 2018, 'Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions', Astrophysical Journal, Supplement Series, vol. 234, no. 2, 34. https://doi.org/10.3847/1538-4365/aaa5a8
Paxton, Bill ; Schwab, Josiah ; Bauer, Evan B. ; Bildsten, Lars ; Blinnikov, Sergei ; Duffell, Paul ; Farmer, R. ; Goldberg, Jared A. ; Marchant, Pablo ; Sorokina, Elena ; Thoul, Anne ; Townsend, Richard H.D. ; Timmes, Francis. / Modules for Experiments in Stellar Astrophysics (MESA) : Convective Boundaries, Element Diffusion, and Massive Star Explosions. In: Astrophysical Journal, Supplement Series. 2018 ; Vol. 234, No. 2.
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