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Title: H ingestion into He-burning convection zones in super-AGB stellar models as a potential site for intermediate neutron-density nucleosynthesis

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [1];  [2];  [2];  [3];  [4];  [5];  [6]
  1. Univ. of Victoria, Victoria, BC (Canada); Heidelberg Institute for Theoretical Studies, Heidelberg (Germany)
  2. Univ. of Victoria, Victoria, BC (Canada); Michigan State Univ., East Lansing, MI (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Hungarian Academy of Sciences, Budapest (Hungary)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Univ. of California, Santa Barbara, CA (United States)
+ Show Author Affiliations

Here we investigate the evolution of super-AGB (SAGB) thermal pulse (TP) stars for a range of metallicities (Z) and explore the effect of convective boundary mixing (CBM). With decreasing metallicity and evolution along the TP phase, the He-shell flash and the third dredge-up (TDU) occur closer together in time. After some time (depending upon the CBM parametrization), efficient TDU begins while the pulse-driven convection zone (PDCZ) is still present, causing a convective exchange of material between the PDCZ and the convective envelope. This results in the ingestion of protons into the convective He-burning pulse. Even small amounts of CBM encourage the interaction of the convection zones leading to transport of protons from the convective envelope into the He layer. H-burning luminosities exceed 10(9) (in some cases 10(10)) L-circle dot. We also calculate models of dredge-out in the most massive SAGB stars and show that the dredge-out phenomenon is another likely site of convective-reactive H-(12)Ccombustion. We discuss the substantial uncertainties of stellar evolution models under these conditions. Nevertheless, the simulations suggest that in the convective-reactive H-combustion regime of H ingestion the star may encounter conditions for the intermediate neutron capture process (i-process). We speculate that some CEMP-s/r stars could originate in i-process conditions in the H ingestion phases of low-Z SAGB stars. This scenario would however suggest a very low electron-capture supernova rate from SAGB stars. We also simulate potential outbursts triggered by such H ingestion events, present their light curves and briefly discuss their transient properties.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396; AC05-00OR22725
OSTI ID:
1329883
Alternate ID(s):
OSTI ID: 1345776
Report Number(s):
LA-UR-15-25096
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 455, Issue 4; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 66 works
Citation information provided by
Web of Science

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Hybrid C-O-Ne white dwarfs as progenitors of type Ia supernovae: dependence on Urca process and mixing assumptions text January 2014
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Cited By (27)

Super-AGB Stars and their Role as Electron Capture Supernova Progenitors journal January 2017
AGB Stars: Remaining Problems journal August 2018
Do electron-capture supernovae make neutron stars?: First multidimensional hydrodynamic simulations of the oxygen deflagration journal September 2016
Unusual neutron-capture nucleosynthesis in a carbon-rich Galactic bulge star journal February 2019
Remnants and ejecta of thermonuclear electron-capture supernovae: Constraining oxygen-neon deflagrations in high-density white dwarfs journal January 2019
The impact of (n, γ ) reaction rate uncertainties of unstable isotopes near N = 50 on the i-process nucleosynthesis in He-shell flash white dwarfs journal April 2018
NuGrid stellar data set – II. Stellar yields from H to Bi for stellar models with MZAMS = 1–25 M⊙ and Z = 0.0001–0.02 journal June 2018
The i-process yields of rapidly accreting white dwarfs from multicycle He-shell flash stellar evolution models with mixing parametrizations from 3D hydrodynamics simulations journal July 2019
The impact of (n,γ) reaction rate uncertainties on the predicted abundances of i-process elements with 32 ≤ Z ≤ 48 in the metal-poor star HD94028 journal December 2019
GALACTIC CHEMICAL EVOLUTION: THE IMPACT OF THE 13 C-POCKET STRUCTURE ON THE s -PROCESS DISTRIBUTION journal January 2017
A Chemical Signature from Fast-rotating Low-metallicity Massive Stars: ROA 276 in ω Centauri journal March 2017
New Neutron-capture Site in Massive Pop III and Pop II Stars as a Source for Heavy Elements in the Early Galaxy journal September 2018
Neutron Star Mergers Might Not Be the Only Source of r -process Elements in the Milky Way journal April 2019
New s -process Mechanism in Rapidly Rotating Massive Population II Stars journal December 2019
SYGMA: Stellar Yields for Galactic Modeling Applications journal August 2018
Residual Carbon in Oxygen–Neon White Dwarfs and Its Implications for Accretion-induced Collapse journal February 2019
Learning about the Intermediate Neutron-capture Process from Lead Abundances journal December 2019
Do electron-capture supernovae make neutron stars? First multidimensional hydrodynamic simulations of the oxygen deflagration text January 2016
The intermediate neutron-capture process and carbon-enhanced metal-poor stars text January 2016
Galactic Chemical Evolution: the Impact of the 13C-pocket Structure on the s-process Distribution text January 2017
Super-AGB Stars and their role as Electron Capture Supernova progenitors text January 2017
NuGrid Stellar Data Set. II. Stellar Yields from H to Bi for Stellar Models with Mzams = 1 to 25Msun and Z = 0.0001 to 0.02 text January 2017
New Neutron-Capture Site in Massive Pop III and Pop II Stars as a Source for Heavy Elements in the Early Galaxy text January 2017
SYGMA: Stellar Yields for Galactic Modeling Applications text January 2017
The i-process yields of rapidly-accreting white dwarfs from multicycle He-shell flash stellar evolution models with mixing parameterizations from 3D hydrodynamics simulations text January 2018
Residual Carbon in Oxygen-Neon White Dwarfs and its Implications for Accretion-Induced Collapse text January 2018
Remnants and ejecta of thermonuclear electron-capture supernovae: Constraining oxygen-neon deflagrations in high-density white dwarfs text January 2018

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