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Title: MODULES FOR EXPERIMENTS IN STELLAR ASTROPHYSICS (MESA): BINARIES, PULSATIONS, AND EXPLOSIONS

We substantially update the capabilities of the open-source software instrument Modules for Experiments in Stellar Astrophysics (MESA). MESA can now simultaneously evolve an interacting pair of differentially rotating stars undergoing transfer and loss of mass and angular momentum, greatly enhancing the prior ability to model binary evolution. New MESA capabilities in fully coupled calculation of nuclear networks with hundreds of isotopes now allow MESA to accurately simulate the advanced burning stages needed to construct supernova progenitor models. Implicit hydrodynamics with shocks can now be treated with MESA, enabling modeling of the entire massive star lifecycle, from pre-main-sequence evolution to the onset of core collapse and nucleosynthesis from the resulting explosion. Coupling of the GYRE non-adiabatic pulsation instrument with MESA allows for new explorations of the instability strips for massive stars while also accelerating the astrophysical use of asteroseismology data. We improve the treatment of mass accretion, giving more accurate and robust near-surface profiles. A new MESA capability to calculate weak reaction rates “on-the-fly” from input nuclear data allows better simulation of accretion induced collapse of massive white dwarfs and the fate of some massive stars. We discuss the ongoing challenge of chemical diffusion in the strongly coupled plasma regime, andmore » exhibit improvements in MESA that now allow for the simulation of radiative levitation of heavy elements in hot stars. We close by noting that the MESA software infrastructure provides bit-for-bit consistency for all results across all the supported platforms, a profound enabling capability for accelerating MESA's development.« less
Authors:
; ;  [1] ; ;  [2] ;  [3] ;  [4] ;  [5] ; ;  [6] ;  [7] ;  [8] ;  [9]
  1. Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106 (United States)
  2. Argelander Institut für Astronomie, Universitat Bonn, Auf dem Hügel 71, D-53121 Bonn (Germany)
  3. Physics Department, University of California, Berkeley, CA 94720 (United States)
  4. Department of Physics, University of California, Santa Barbara, CA 93106 (United States)
  5. Laboratoire Lagrange, UMR7293, Université Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d’Azur, F-06300 Nice (France)
  6. School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287 (United States)
  7. SRON, Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht (Netherlands)
  8. Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706 (United States)
  9. Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL 35487 (United States)
Publication Date:
OSTI Identifier:
22519957
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 220; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR MOMENTUM; ASTROPHYSICS; COMPUTERIZED SIMULATION; DIFFUSION; HYDRODYNAMICS; M CODES; MAIN SEQUENCE STARS; MASS; NUCLEAR REACTIONS; NUCLEOSYNTHESIS; OSCILLATIONS; PLASMA; PULSATIONS; REACTION KINETICS; SHOCK WAVES; STAR EVOLUTION; SURFACES; WHITE DWARF STARS