MAGNETOROTATIONALLY DRIVEN SUPERNOVAE AS THE ORIGIN OF EARLY GALAXY r-PROCESS ELEMENTS?

By C. Winteler, R. Kaeppeli, Albino Perego, A. Arcones, N. Vasset, N. Nishimura, M. Liebendoerfer, Friedrich-Karl Thielemann. 2012

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We examine magnetorotationally driven supernovae as sources of r-process elements in the early Galaxy. On the basis of thermodynamic histories of tracer particles from a three-dimensional magnetohydrodynamical core-collapse supernova model with approximated neutrino transport, we perform nucleosynthesis calculations with and without considering the effects of neutrino absorption reactions on the electron fraction (Ye) during post-processing. We find that the peak distribution of Ye in the ejecta is shifted from ∼0.15 to ∼0.17 and broadened toward higher Ye due to neutrino absorption. Nevertheless, in both cases, the second and third peaks of the solar r-process element distribution can be reproduced well. The rare progenitor configuration that was used here, characterized by a high rotation rate and a large magnetic field necessary for the formation of bipolar jets, could naturally provide a site for the strong r-process in agreement with observations of the early Galactic chemical evolution.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/d234e46a596e96418b447a2a856f69afeff0305f

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Citations in the corpus

The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars (2014, background): “…been hypothesised to occur during supernovae explosions (Fryer et al. 2006; Wanajo et al. 2009, 2011; Arcones et al. 2007; Arcones & Montes 2011; Winteler et al. 2012) but other sites have also been proposed including colliding neutron stars (Argast et al. 2004; Korobkin et al. 2012), and black…”
PRODUCTION OF ALL THE r-PROCESS NUCLIDES IN THE DYNAMICAL EJECTA OF NEUTRON STAR MERGERS (2014, background): “One possible exception could be the scenario of (still hypothetical) rapidly rotating, strongly magnetized CCSN cores (Winteler et al. 2012).”
The first direct double neutron star merger detection: Implications for cosmic nucleosynthesis (2017, methodology): “For example, the results for the Finite-Range Droplet Model (FRDM; this mass model is used in WinNet; Moeller 1995) and the nuclear mass model of Duflo and Zuker (DZ; Duflo & Zuker 1995) differed at time scales of about a day by a factor of ∼ 5 in their net heating rates q̇ ftot.”
The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. III. Optical and UV Spectra of a Blue Kilonova from Fast Polar Ejecta (2017, background): “Jets in core-collapse supernovae may be an alternative (or additional) site of the r-process (Winteler et al. 2012; Nishimura et al. 2015).”
SYSTEMATICS OF DYNAMICAL MASS EJECTION, NUCLEOSYNTHESIS, AND RADIOACTIVELY POWERED ELECTROMAGNETIC SIGNALS FROM NEUTRON-STAR MERGERS (2013, background): “(For reviews on r-process nucleosynthesis and an overview of potential sites, (see e.g. Arnould et al. 2007; Thielemann et al. 2011; Banerjee et al. 2011; Winteler et al. 2012).)”
Production of the entire range of r-process nuclides by black hole accretion disc outflows from neutron star mergers (2016, methodology): “…is MHD-powered, additional magnetocentrifugal acceleration could substantially reduce the electron fraction of the outflow compared to its value in the purely neutrino-driven case favouring the occurrence of an r-process (e.g. Burrows et al. 2007, Winteler et al. 2012, Nishimura et al. 2015).”
The long-term evolution of neutron star merger remnants – I. The impact of r-process nucleosynthesis (2013, methodology): “…of the dynamic ejecta from com- 1 A possible exception may be stars with the particular, and probably rare, combination of fast rotation and very large precollapse magnetic field (Winteler et al. 2012). pact binary mergers, however, goes beyond their roles as promising nucleosynthesis site.”
The Intermediate r-process in Core-collapse Supernovae Driven by the Magneto-rotational Instability (2016, background): “The explosion process of the polar jet is similar to the magnetically dominated mechanism in previous studies (e.g. Winteler et al. 2012; Nishimura et al. 2015), where strong magnetic pressure drives outward ejection, overcoming ram pressure.”
The impact of individual nuclear properties on $r$-process nucleosynthesis (2015, background): “Other potential astrophysical sites that have been explored include hot accretion disk outflows from neutron star or neutron star-black hole mergers [35, 36, 30, 31], supernova neutronrich jets [37], gamma-ray burst collapsar outflows [38, 39, 40], shocked surface layers of O-Ne-Mg cores [41, 42], a”
Neutrino-driven winds from neutron star merger remnants (2014, methodology): “For the nucleosynthesis calculations we employ the WINNET nuclear reaction network (Winteler 2012; Winteler et al. 2012), which represents an update of BASNET network code (Thielemann et al. 2011).”
THE r-PROCESS NUCLEOSYNTHESIS IN THE VARIOUS JET-LIKE EXPLOSIONS OF MAGNETOROTATIONAL CORE-COLLAPSE SUPERNOVAE (2015, methodology): “Although our explosion models are based on the axisymmetric hydrodynamics, nucleosynthesis properties of the prompt models are expected to be similar to the result of polar-like jets in full three-dimensional simulations (Winteler et al. 2012).”
Astrophysics with Extraterrestrial Materials (2016, background): “…site or sites where it occurs remain unknown, though neutrino winds from SNe, low-mass SNe, mergers of neutron stars with each other or with black holes, and magnetorotationally driven SNe have all been suggested (Meyer 1994, Freiburghaus et al. 1999, Wanajo et al. 2011, Winteler et al. 2012).”
MAGNETOROTATIONAL CORE-COLLAPSE SUPERNOVAE IN THREE DIMENSIONS (2014, background): “The lobes carry neutron rich (Ye ∼ 0.1−0.2) material of moderate entropy (s∼ 10 − 15kB baryon−1), which could lead to interesting r-process yields, similar to what Winteler et al. (2012) found for their prompt jet-driven explosion.”
The Emergence of a Lanthanide-rich Kilonova Following the Merger of Two Neutron Stars (2017, methodology): “The r-process nucleosynthesis and radioactive heating are computed using the nuclear network code WinNet (Thielemann et al. 2011; Korobkin et al. 2012; Winteler et al. 2012) with a reaction rates compilation for the finite range droplet model (FRDM; Möller et al. 1995; Rauscher & Thielemann 2000).”