Nucleosynthesis modes in the high-entropy-wind of type II supernovae

Kratz, Karl; Farouqi, K.; Mashonkina, L.; Pfeiffer, B.

doi:10.1016/j.newar.2008.06.015

Cited by 32 publications

(38 citation statements)

References 48 publications

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“…In our previous papers (Farouqi et al 2008a,b;Kratz et al 2008;Farouqi et al 2009), we have compared our HEW model results to the classical SS isotopic "r-residuals" (Nr,⊙= N⊙-Ns; (see, e.g. Käppeler, Beer & Wis (1989); Arlandini et al (1999)) and to recent elemental abundances in UMP halo stars (see, e.g.…”

Section: Calculations and Resultsmentioning

confidence: 99%

“…Barklem et al (2005); François et al (2007); Mashonkina et al (2007)) revived and intensified interest in the nucleosynthesis of these elements, and have motivated various theoretical studies with increasing realism (see, e.g. Hoffman et al (1996); Rauscher et al (2002); Travaglio et al (2004); Fröhlich et al (2006); Farouqi et al (2008a,b); Kratz et al (2008); Pignatari et al (2008); Wanajo et al (2009) ;Farouqi et al (2009)). In addition, measurements of the isotopic compositions of trans-Fe elements in presolar SiC grains of type X (see, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Co-Production of Light p-, s- and r-Process Isotopes in the High-Entropy Wind of Type II Supernovae

Farouqi

Kratz

Pfeiffer

2009

Publ. – Astron. Soc. Aust

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Abstract:We have performed large-scale nucleosynthesis calculations within the high-entropy-wind (HEW) scenario of Type II supernovae. The primary aim was to constrain the conditions for the production of the classical 'p-only' isotopes of the light trans-Fe elements. We find, however, that for electron fractions in the range 0.458 ≤ Y e ≤ 0.478, sizeable abundances of p-, s-and r-process nuclei between 64 Zn and 98 Ru are coproduced in the HEW at low entropies (S ≤ 100) by a primary charged-particle process after an α-rich freezeout. With the above Y e -S correlation, most of the predicted isotopic abundance ratios within a given element, e.g. 64 Mo, Mo up to 'r-only' 100 Mo. Furthermore, our model is able to reproduce the isotopic composition of Mo in presolar SiC X-grains.

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Section: Calculations and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Co-Production of Light p-, s- and r-Process Isotopes in the High-Entropy Wind of Type II Supernovae

Farouqi

Kratz

Pfeiffer

2009

Publ. – Astron. Soc. Aust

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“…More recent two-dimensional hydrodynamic explosion models of electron-capture SNe also produce [As/Ge]= 1 (Wanajo et al 2011b). Models for nucleosynthesis in proton-rich neutrino wind components predict a large scatter among the relative ratios of Ge, As, and Se, and the integrated [(Ge+As+Se)/Fe] ratio in CCSN ejecta is not often available (e.g., Kratz et al 2008;Roberts et al 2010;Arcones & Montes 2011;Wanajo et al 2011a;Arcones et al 2012). Previously, most studies have focused on the Sr-Ag mass region (e.g., Hansen et al 2012).…”

Section: Possible Nucleosynthesis Scenariosmentioning

confidence: 99%

THE DIVERSE ORIGINS OF NEUTRON-CAPTURE ELEMENTS IN THE METAL-POOR STAR HD 94028: POSSIBLE DETECTION OF PRODUCTS OF i-PROCESS NUCLEOSYNTHESIS*

Roederer

Karakas

Pignatari

et al. 2016

ApJ

105

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We present a detailed analysis of the composition and nucleosynthetic origins of the heavy elements in the metalpoor ( We analyze an archival near-ultraviolet spectrum of HD94028, collected using the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope, and other archival optical spectra collected from ground-based telescopes. We report abundances or upper limits derived from 64species of 56elements. We compare these observations with s-process yields from low-metallicity AGB evolution and nucleosynthesis models. No combination of s-and r-process patterns can adequately reproduce the observed abundances, including the super-solar [As/Ge] ratio (+0.99 ± 0.23) and the enhanced [Mo/Fe] and [Ru/Fe] ratios. We can fit these features when including an additional contribution from the intermediate neutroncapture process (i process), which perhaps operated through the ingestion of H in He-burning convective regions in massive stars, super-AGB stars, or low-mass AGB stars. Currently, only the iprocess appears capable of consistently producing the super-solar [As/Ge] ratios and ratios among neighboring heavy elements found in HD94028. Other metal-poor stars also show enhanced [As/Ge] ratios, hinting that operation of the iprocess may have been common in the early Galaxy.

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“…Qian and Wasserburg suggested a charge-particle reaction process (CPR) [13], which could operate in neutrino-driven winds, even in instances when conditions for an r-process are not achieved. Farouqui et al [14,15] proposed that Sr−Zr elements can be primarily produced in the low-entropy expanding envelopes of core-collapse supernovae explosions through chargeparticle and neutron-capture reactions.…”

Section: Introductionmentioning

confidence: 99%

βdecay of nuclei around90Se: Search for signatures of aN=56subshell closure relevant to the
Quinn
¹
,
Aprahamian
²
,
Pereira
³

et al. 2012
Phys. Rev. C
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Nucleosynthesis modes in the high-entropy-wind of type II supernovae

Cited by 32 publications

References 48 publications

Co-Production of Light p-, s- and r-Process Isotopes in the High-Entropy Wind of Type II Supernovae

Co-Production of Light p-, s- and r-Process Isotopes in the High-Entropy Wind of Type II Supernovae

THE DIVERSE ORIGINS OF NEUTRON-CAPTURE ELEMENTS IN THE METAL-POOR STAR HD 94028: POSSIBLE DETECTION OF PRODUCTS OF i-PROCESS NUCLEOSYNTHESIS*

βdecay of nuclei around90Se: Search for signatures of aN=56subshell closure relevant to the
Quinn
¹
,
Aprahamian
²
,
Pereira
³

et al. 2012
Phys. Rev. C
Self Cite

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Nucleosynthesis modes in the high-entropy-wind of type II supernovae

Cited by 32 publications

References 48 publications

Co-Production of Light p-, s- and r-Process Isotopes in the High-Entropy Wind of Type II Supernovae

Co-Production of Light p-, s- and r-Process Isotopes in the High-Entropy Wind of Type II Supernovae

THE DIVERSE ORIGINS OF NEUTRON-CAPTURE ELEMENTS IN THE METAL-POOR STAR HD 94028: POSSIBLE DETECTION OF PRODUCTS OF i-PROCESS NUCLEOSYNTHESIS*

βdecay of nuclei around90Se: Search for signatures of aN=56subshell closure relevant to theQuinn1, Aprahamian2, Pereira3 et al. 2012Phys. Rev. CSelf Cite

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About

βdecay of nuclei around90Se: Search for signatures of aN=56subshell closure relevant to the
Quinn
¹
,
Aprahamian
²
,
Pereira
³

et al. 2012
Phys. Rev. C
Self Cite