Outputs (123)

Progenitors of Core-Collapse Supernovae (2017)
Journal Article
Hirschi, R., Arnett, D., Cristini, A., Georgy, C., Meakin, C., & Walkington, I. (2017). Progenitors of Core-Collapse Supernovae. Proceedings of the International Astronomical Union, 12(S331), 1-10. https://doi.org/10.1017/S1743921317004896

Massive stars have a strong impact on their surroundings, in particular when they produce a core-collapse supernova at the end of their evolution. In these proceedings, we review the general evolution of massive stars and their properties at collapse... Read More about Progenitors of Core-Collapse Supernovae.

Impact of Rotation and Convective Boundary Mixing in Low Mass AGB Stars (2017)
Journal Article
den Hartogh, J., Battino, U., Hirschi, R., Pignatari, M., & Herwig, F. (2017). Impact of Rotation and Convective Boundary Mixing in Low Mass AGB Stars. JPS Conference Proceedings, https://doi.org/10.7566/jpscp.14.020904

After central He burning exhaustion, stars with an initial mass of 1.5–3 solar masses start the AGB phase. In this phase, the s-process takes place, which is producing about half of all elements heavier than iron. We calculated non-rotating AGB stell... Read More about Impact of Rotation and Convective Boundary Mixing in Low Mass AGB Stars.

Impacts of Nuclear-Physics Uncertainty in Stellar Temperatures on the s-Process Nucleosynthesis (2017)
Journal Article
Nishimura, N., Cescutti, G., Hirschi, R., Rauscher, T., Den Hartogh, J., & Murphy, A. S. J. (2017). Impacts of Nuclear-Physics Uncertainty in Stellar Temperatures on the s-Process Nucleosynthesis. JPS Conference Proceedings, https://doi.org/10.7566/jpscp.14.020903

We evaluated the uncertainty relevant to s-process nucleosynthesis using a Monte-Carlo centred approach. We are based on a realistic and general prescription of temperature dependent uncertainty for the reactions. We considered massive stars for the... Read More about Impacts of Nuclear-Physics Uncertainty in Stellar Temperatures on the s-Process Nucleosynthesis.

Constraining the efficiency of angular momentum transport with asteroseismology of red giants: the effect of stellar mass (2017)
Journal Article
Eggenberger, P., Lagarde, N., Miglio, A., Montalbán, J., Ekström, S., Georgy, C., …Hirschi, R. (2017). Constraining the efficiency of angular momentum transport with asteroseismology of red giants: the effect of stellar mass. Astronomy & Astrophysics, 599, Article A18. https://doi.org/10.1051/0004-6361/201629459

Context. Constraints on the internal rotation of red giants are now available thanks to asteroseismic observations. Preliminary comparisons with rotating stellar models indicate that an undetermined additional process for the internal transport of an... Read More about Constraining the efficiency of angular momentum transport with asteroseismology of red giants: the effect of stellar mass.

Massive Star Evolution: What we do (not) know (2016)
Journal Article
Georgy, C., Hirschi, R., & Ekström, S. (2016). Massive Star Evolution: What we do (not) know. Proceedings of the Polish Astronomical Society, 5, 37-44

The modelling of massive star evolution is a complex task, and is very sensitive to the way physical processes (such as convection, rotation, mass loss, etc.) are included in stellar evolution code. Moreover, the very high observed fraction of binary... Read More about Massive Star Evolution: What we do (not) know.

The First 3D Simulations of Carbon Burning in a Massive Star (2016)
Conference Proceeding
Cristini, A., Meakin, C., Hirschi, R., Arnett, D., Georgy, C., & Viallet, M. (2016). The First 3D Simulations of Carbon Burning in a Massive Star. . https://doi.org/10.1017/s1743921317003441

We present the first detailed three-dimensional hydrodynamic implicit large eddy simulations of turbulent convection for carbon burning. The simulations start with an initial radial profile mapped from a carbon burning shell within a 15 M⊙ stellar ev... Read More about The First 3D Simulations of Carbon Burning in a Massive Star.

Fast evolving pair-instability supernova models: evolution, explosion, light curves (2016)
Journal Article
Kozyreva, A., Gilmer, M., Hirschi, R., Fröhlich, C., Blinnikov, S., Wollaeger, R. T., …Sorokina, E. (2017). Fast evolving pair-instability supernova models: evolution, explosion, light curves. Monthly Notices of the Royal Astronomical Society, 464(3), 2854-2865. https://doi.org/10.1093/mnras/stw2562

With an increasing number of superluminous supernovae (SLSNe) discovered, the question of their origin remains open and causes heated debates in the supernova community. Currently, there are three proposed mechanisms for SLSNe: (1) pair-instability s... Read More about Fast evolving pair-instability supernova models: evolution, explosion, light curves.

Looking for imprints of the first stellar generations in metal-poor bulge field stars (2016)
Journal Article
Hirschi. (2016). Looking for imprints of the first stellar generations in metal-poor bulge field stars. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/201628104

Context. Efforts to look for signatures of the first stars have concentrated on metal-poor halo objects. However, the low end of the bulge metallicity distribution has been shown to host some of the oldest objects in the Milky Way and hence this Gala... Read More about Looking for imprints of the first stellar generations in metal-poor bulge field stars.

Uncertainties in the production of p nuclei in massive stars obtained from Monte Carlo variations (2016)
Journal Article
Rauscher, T., Nishimura, N., Hirschi, R., Cescutti, G., Murphy, A., & Heger, A. (2016). Uncertainties in the production of p nuclei in massive stars obtained from Monte Carlo variations. Monthly Notices of the Royal Astronomical Society, 463(4), 4153 - 4166. https://doi.org/10.1093/mnras/stw2266

Nuclear data uncertainties in the production of p nuclei in massive stars have been quantified in a Monte Carlo procedure. Bespoke temperature-dependent uncertainties were assigned to different types of reactions involving nuclei from Fe to Bi. Their... Read More about Uncertainties in the production of p nuclei in massive stars obtained from Monte Carlo variations.

Nugrid stellar data set. I. Stellar yields from H to BI for stars with metallicities z=0.02 and z=0.01 (2016)
Journal Article
Hirschi. (2016). Nugrid stellar data set. I. Stellar yields from H to BI for stars with metallicities z=0.02 and z=0.01. Astrophysical Journal Supplement, https://doi.org/10.3847/0067-0049/225/2/24

We provide a set of stellar evolution and nucleosynthesis calculations that applies established physics assumptions simultaneously to low- and intermediate-mass and massive star models. Our goal is to provide an internally consistent and comprehensiv... Read More about Nugrid stellar data set. I. Stellar yields from H to BI for stars with metallicities z=0.02 and z=0.01.