Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
Bill Paxton,Radosław Smolec,Josiah Schwab,A. Gautschy,Lars Bildsten,Lars Bildsten,Matteo Cantiello,Matteo Cantiello,Aaron Dotter,Robert Farmer,Jared A. Goldberg,Adam S. Jermyn,Shashi M. Kanbur,Pablo Marchant,Anne Thoul,Richard H. D. Townsend,William M. Wolf,William M. Wolf,Michael Zhang,Francis Timmes +19 more
TLDR
In this paper, the capabilities of the open-knowledge software instrument Modules for Experiments in Stellar Astrophysics (MESA) have been updated to improve numerical energy conservation capabilities, including during mass changes.Abstract:
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 nonlinear 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, as well as 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.read more
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Evolutionary roads leading to low effective spins, high black hole masses, and O1/O2 rates for LIGO/Virgo binary black holes
Krzysztof Belczynski,J. Klencki,C. E. Fields,A. Olejak,A. Olejak,Emanuele Berti,Georges Meynet,Chris L. Fryer,Daniel E. Holz,Richard O'Shaughnessy,Duncan A. Brown,Tomasz Bulik,Shing-Chi Leung,Shing-Chi Leung,Ken'ichi Nomoto,Piero Madau,Raphael Hirschi,Raphael Hirschi,Etienne A. Kaiser,Samuel Jones,S. Mondal,Martyna Chruslinska,P. Drozda,Davide Gerosa,Zoheyr Doctor,Zoheyr Doctor,Mirek Giersz,Sylvia Ekström,Cyril Georgy,Abbas Askar,Vishal Baibhav,Daniel Wysocki,T. Natan,Will M. Farr,Grzegorz Wiktorowicz,M. Coleman Miller,Ben Farr,Jean-Pierre Lasota,Jean-Pierre Lasota +38 more
TL;DR: In this article, the authors proposed three models of angular momentum transport in massive stars: a mildly efficient transport by meridional currents, an efficient transport implemented in the MESA code, and a very efficient transport to calculate natal BH spins.
Journal ArticleDOI
Mind the gap: The location of the lower edge of the pair instability supernovae black hole mass gap
TL;DR: In this article, the location of the lower edge of the mass gap at 45$M_\odot$ is remarkably robust against variations in the metallicity, the treatment of internal mixing, and stellar wind mass loss.
Journal ArticleDOI
Mind the Gap: The Location of the Lower Edge of the Pair-instability Supernova Black Hole Mass Gap
Robert Farmer,Mathieu Renzo,S. E. de Mink,S. E. de Mink,Pablo Marchant,Stephen Justham,Stephen Justham +6 more
TL;DR: In this article, the location of the lower edge of the mass gap at 45 M is remarkably robust against variations in the metallicity, the treatment of internal mixing, and stellar wind mass loss, making it the most robust predictor for the final stages of the evolution of massive stars.
Journal ArticleDOI
One channel to rule them all? Constraining the origins of binary black holes using multiple formation pathways
Michael Zevin,Michael Zevin,Simone S. Bavera,Christopher P. L. Berry,Vicky Kalogera,Tassos Fragos,Pablo Marchant,Carl L. Rodriguez,Fabio Antonini,Daniel E. Holz,Chris Pankow +10 more
TL;DR: In this paper, a suite of five state-of-the-art binary black hole population models covering a range of isolated and dynamical formation channels was used to infer branching fractions between channels and constraints on uncertain physical processes that impact the observational properties of mergers.
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TL;DR: The second Gaia data release, Gaia DR2 as mentioned in this paper, is a major advance with respect to Gaia DR1 in terms of completeness, performance, and richness of the data products.