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8 results for “Nucleosynthesis”
Datasets for ``Big bang nucleosynthesis limits and relic gravitational waves detection prospects''
<pre>This directory contains an index.html file with links to the run directories with secondary data for Table I of the paper "Big bang nucleosynthesis limits and relic gravitational waves detection prospects" by T. Kahniashvili, E. Clarke, J. Stepp, & Axel Brandenburg. If anything turns out to be incomplete, please email brandenb@nordita.org. </pre>
The nebular spectra of SN 2012aw and constraints on stellar nucleosynthesis from oxygen emission lines
<p>Spectral models of M_ZAMS = 12, 15, 19, 25 Msun progenitors, all epochs.</p>
Constraints on Bygone Nucleosynthesis of Accreting Neutron Stars
<p>MESA inlists and run_star_extras associated with <a href="https://ui.adsabs.harvard.edu/#abs/2017ApJ...837...73M/abstract">Meisel & Deibel (2017)</a>. MESA version 9575.</p> <p>Publication DOI: <a href="https://doi.org/10.3847/1538-4357/aa618d">10.3847/1538-4357/aa618d</a></p>
Code dependencies of pre-supernova evolution and nucleosynthesis in massive stars: evolution to the end of core helium burning
<p>MESA inlists associated with <a href="https://ui.adsabs.harvard.edu/?#abs/2015MNRAS.447.3115J">Jones et al. (2015)</a>. MESA version 3709.</p> <p>Publication DOI: <a href="https://doi.org/10.1093/mnras/stu2657">10.1093/mnras/stu2657</a></p> <p>Files are also available in a gihub repository <a href="https://github.com/swjones/mesa-Teile/tree/master/Jones.etal.2015.MNRAS.447.4.3115">here</a></p>
Binary Neutron Star Mergers: Mass Ejection, Electromagnetic Counterparts, and Nucleosynthesis
<p>We release dynamical ejecta data from binary neutron star merger simulations. The outflows are extracted at a fixed coordinate sphere with radius 300 G/c^2 Msun (= 443 km). Only material unbound according to the geodesic criterion is considered to be part of the dynamical ejecta. See [1] for more details.</p> <p>Included data:</p> <ul> <li>`Table2.txt`: Table 2 of the paper in machine readable format</li> <li>`tabulated_nucsyn.h5`: nucleosynthesis yields from pre-computed parametrized trajectories. The first three indices of each dataset are Ye, entropy, and expansion timescale tau. For example `Y_final[iYe, ientr, itau, iiso]` gives the final abundance of isotope `iiso` with `A[iiso]` and `Z[iiso]` for a trajectory with initial Ye = `Ye[iYe]`, initial entropy `s[ientr]`, and expansion timescale `tau[itau]`.</li> <li>`tabulated_rho.h5`: gives the density at T = 6 GK corresponding to the Ye, entropy, and expansion timescale used in `tabulated_nucsyn.h5`.</li> <li>`[model].tar`: ejecta data for individual simulations. The naming convention is the same as in the paper.</li> </ul> <p>For each model we provide:</p> <ul> <li>`outflow.txt`: angle integrated outflow rate and cumulated ejecta mass. Data are given in units with Msun = G = c = 1 (eg, the conversion factor for time to seconds is 4.9258e-6).</li> <li>`hist_entropy.dat`: histogram of the ejecta as a function of the entropy (in kb)</li> <li>`hist_vinf.dat`: histogram of the ejecta as a function of the asymptotic velocity (in units of c)</li> <li>`hist_ye.dat`: histogram of the ejecta as a function of the electron fraction Ye.</li> <li>`profile.txt`: time integrated ejecta profiles as a function of the polar angle.</li> <li>`hist_vinf_theta.h5`: histograms of the ejecta as a function of the asymptotic velocity and the polar angle.</li> <li>`hist_ye_theta.h5`: histograms of the ejecta as a function of the asymptotic velocity and the polar angle.</li> <li>`hist_ye_entropy_tau.h5`: histograms of the ejecta as a function of Ye, entropy, and expansion timescale tau.</li> </ul> <p>Additionally we distribute:</p> <ul> <li>Initial data generated with LORENE and associated EOS tables.</li> <li>EOS tables used for the evolution</li> <li>Parameter file used for each simulation</li> </ul> <p>For the multidimensional histograms the indices are ordered as specified in the file name, ie the file `hist_ye_theta.h5` tabulates the ejecta mass as a function of Ye (first index) and polar angle theta (second index).</p> <p><br> [1] D. Radice, A. Perego, K. Hotokezaka, S. A. Fromm, S. Bernuzzi, and L. F. Roberts, <em>Binary Neutron Star Mergers: Mass Ejection, Electromagnetic Counterparts, and Nucleosynthesis</em>, <a href="https://dx.doi.org/10.3847/1538-4357/aaf054">ApJ 869:130 (2018)</a>, <a href="https://arxiv.org/abs/1809.11161">arXiv:1809.11161</a></p>
Nucleosynthesis of binary-stripped stars.
<p>The cosmic origin of the elements, the fundamental chemical building blocks of the Universe, is still uncertain. Binary interactions play a key role in the evolution of many massive stars, yet their impact on chemical yields is poorly understood. Using the MESA stellar evolution code we predict the chemical yields ejected in wind mass loss and the supernovae of single and binary-stripped stars. We do this with a large 162 isotope nuclear network at solar-metallicity. We find that binary-stripped stars are more effective producers of the elements than single stars, due to their increased mass loss and an increased chance to eject their envelopes during a supernova. This increased production by binaries varies across the periodic table, with \fluorine[] and \potassium[] being more significantly produced by binary-stripped stars than single stars. We find that the \carbon[12]/\carbon[13] could be used as an indicator of the conservativeness of mass transfer, as \carbon[13] is preferentially ejected during mass transfer while \carbon[12] is preferentially ejected during wind mass loss. We identify a number of gamma-ray emitting radioactive isotopes that may be used to help constrain progenitor and explosion models of core-collapse supernovae with next-generation gamma-ray detectors. For single stars we find \vanadium[44] and \manganese[52] are strong probes of the explosion model, while for binary-stripped stars it is \chromium[48]. Our findings highlight that binary-stripped stars are not equivalent to two single stars and that detailed stellar modelling is needed to predict their final nucleosynthetic yields.</p><p> </p><p>MESA version: 12115</p><p> </p><p>This dataset contains the inlists, output from MESA, scripts, and data tables used in this publication.</p><p> </p><p>The tables folder contains the chemical yields for all models, isotopes, and mass loss processes.</p><p> </p><p>Accepeted for publication in ApJ</p>
K and Mo nucleosynthesis calculations
<p>This dataset generates figures S5, S8, and S9 in N. X. Nie, D. Wang, Z. A. Torrano, R. W. Carlson, C. M. O'D. Alexander, A. Shahar (2023) Meteorites have inherited nucleosynthetic anomalies of potassium-40 produced in supernovae. The dataset contains .xlsx files presenting the output data of the nucleosynthesis of K and Mo isotopes in supernovae and AGB stars, using the existing nucleosynthesis models. The data was used to investigate the production of K and Mo isotopes in stars and to compare that with the Solar System composition.</p>
K and Mo nucleosynthesis calculations
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