scholarly journals Long-term evolution of surviving companion stars of Type Iax supernovae

2020 ◽  
Vol 500 (1) ◽  
pp. 301-309
Author(s):  
Zheng-Wei Liu ◽  
Yaotian Zeng
Keyword(s):  
Stellar Evolution ◽  
Main Sequence ◽  
Three Dimensional ◽  
Late Time ◽  
One Dimensional ◽  
Term Evolution ◽  
Post Impact ◽  
Explosion Mechanism ◽  
Hydrodynamical Simulations

ABSTRACT The nature of the progenitors and explosion mechanism of Type Iax supernovae (SNe Iax) remain a mystery. The single-degenerate (SD) systems that involve the incomplete pure deflagration explosions of near-Chandrasekhar-mass white dwarfs (WDs) have recently been proposed for producing SNe Iax in which non-degenerate companions are expected to survive from SN explosions. In this work, we concentrate on the main-sequence (MS) donor SD progenitor systems. By mapping the computed companion models from three-dimensional hydrodynamical simulations of ejecta-companion interaction into a one-dimensional stellar evolution code mesa, we investigate the long-term appearance and observational signatures of surviving MS companions of SNe Iax by tracing their post-impact evolution. Depending on different MS companion models, it is found that the shocked surviving companion stars can significantly expand and evolve to be more luminous (5–$500\, L_{\odot }$) for a time-scale of 10–104 yr. Comparing with the late-time light curve of an observed SN Iax (SN 2005hk), it is suggested that surviving MS companions of SNe Iax would expect to be visible about 1000 d after the explosion when SN itself has been faded.

scholarly journals Transforming Gas Giant Planets into Smaller Objects Through Tidal Disruption

2012 ◽  
Vol 8 (S293) ◽  
pp. 356-361
Author(s):  
Shang-Fei Liu ◽  
James Guillochon ◽  
Douglas N. C. Lin ◽  
Enrico Ramirez-Ruiz
Keyword(s):  
Three Dimensional ◽  
Giant Planets ◽  
Adiabatic Evolution ◽  
Tidal Disruption ◽  
Dynamical Processes ◽  
Term Evolution ◽  
Gas Giant ◽  
Hydrodynamical Simulations ◽  
Host Stars

AbstractRecent observations have revealed several Jupiter-mass planets with highly eccentric and / or misaligned orbits, which clearly suggests that dynamical processes operated in these systems. These dynamical processes may result in close encounters between Jupiter-like planets and their host stars. Using three-dimensional hydrodynamical simulations, we find that planets with cores are more likely to be retained by their host stars in contrast with previous studies which suggested that coreless planets are often ejected. We propose that after a long term evolution some gas giant planets could be transformed into super-Earths or Neptune-like planets, which is supported by our adiabatic evolution models. Finally, we analyze the orbits and structure of known planets and Kepler candidates and find that our model is capable of producing some of the shortest-period objects.

scholarly journals The interaction of core-collapse supernova ejecta with a stellar companion

2018 ◽  
Vol 14 (S346) ◽  
pp. 55-58
Author(s):  
Zheng-Wei Liu ◽  
T. M. Tauris ◽  
F. K. Röpke ◽  
T. J. Moriya ◽  
M. Kruckow ◽  
...  
Keyword(s):  
Binary Systems ◽  
Main Sequence ◽  
Three Dimensional ◽  
Core Collapse ◽  
Chemical Contamination ◽  
Binary Separation ◽  
Hydrodynamical Simulations ◽  
Many Core ◽  
The Impact

AbstractThe progenitors of many core-collapse supernovae (CCSNe) are expected to be in binary systems. By performing a series of three-dimensional hydrodynamical simulations, we investigate how CCSN explosions affect their binary companion. We find that the amount of removed stellar mass, the resulting impact velocity, and the chemical contamination of the companion that results from the impact of the SN ejecta, strongly increases with decreasing binary separation and increasing explosion energy. Also, it is foud that the impact effects of CCSN ejecta on the structure of main-sequence (MS) companions, and thus their long term post-explosion evolution, are in general not dramatic.

scholarly journals On monolithic supermassive stars

2020 ◽  
Vol 494 (2) ◽  
pp. 2236-2243 ◽  
Author(s):  
Tyrone E Woods ◽  
Alexander Heger ◽  
Lionel Haemmerlé
Keyword(s):  
Early Universe ◽  
Stellar Evolution ◽  
Time Scale ◽  
Main Sequence ◽  
Massive Stars ◽  
Rotating Stars ◽  
One Dimensional ◽  
General Relativistic ◽  
The One ◽  
Limiting Case

ABSTRACT Supermassive stars have been proposed as the progenitors of the massive ($\sim \!10^{9}\, \mathrm{M}_{\odot }$) quasars observed at z ∼ 7. Prospects for directly detecting supermassive stars with next-generation facilities depend critically on their intrinsic lifetimes, as well as their formation rates. We use the one-dimensional stellar evolution code kepler to explore the theoretical limiting case of zero-metallicity non-rotating stars, formed monolithically with initial masses between $10$ and $190\, \mathrm{kM}_{\odot }$. We find that stars born with masses between $\sim\! 60$ and $\sim\! 150\, \mathrm{kM}_{\odot }$ collapse at the end of the main sequence, burning stably for $\sim\! 1.5\, \mathrm{Myr}$. More massive stars collapse directly through the general relativistic instability after only a thermal time-scale of $\sim\! 3$–$4\, \mathrm{kyr}$. The expected difficulty in producing such massive thermally relaxed objects, together with recent results for currently preferred rapidly accreting formation models, suggests that such ‘truly direct’ or ‘dark’ collapses may not be typical for supermassive objects in the early Universe. We close by discussing the evolution of supermassive stars in the broader context of massive primordial stellar evolution and the possibility of supermassive stellar explosions.

Investigation of Carbon Budget Around Artificial Upwelling Generator by a Coupled Physical-Biological Model

2007 ◽  
Author(s):  
Shigeru Tabeta ◽  
Haruki Yoshimoto
Keyword(s):  
Carbon Budget ◽  
Three Dimensional ◽  
Ecosystem Model ◽  
Biological Model ◽  
Target Area ◽  
Biological Pump ◽  
One Dimensional ◽  
Carbon Cycles ◽  
Fish Catch

There are several projects of generating upwelling by artificial structures to enhance the primary production expecting fish catch increase. From the view point of global environment, CO2 budget between atmosphere and ocean due to such technologies are also interesting. In this study, a coupled physical-biological model was developed to simulate the nitrogen and carbon cycles around artificial upwelling generator. The model is focusing on the degradation of particulate organic matter, because the process should much affects on the efficiency of the biological pump. The model is tuned by using the experimental data and applied to simulate the material cycle in the target area which is located north of Ikitsuki Island located northwest of Kyusyu, Japan, where an artificial seabed mound is installed to generate upwelling. The long-term carbon budget is also estimated by vertical one-dimensional ecosystem model using the parameters determined from the results of the three-dimensional coupled physical-biological model.

scholarly journals Stochastic Modeling of Density-Dependent Diploid Populations and the Extinction Vortex

2014 ◽  
Vol 46 (2) ◽  
pp. 446-477 ◽  
Author(s):  
Camille Coron
Keyword(s):  
Resource Competition ◽  
Adaptive Dynamics ◽  
Three Dimensional ◽  
Death Process ◽  
Fixation Rate ◽  
One Dimensional ◽  
Rare Mutations ◽  
Recurrence Relationship ◽  
Extinction Vortex

We model and study the genetic evolution and conservation of a population of diploid hermaphroditic organisms, evolving continuously in time and subject to resource competition. In the absence of mutations, the population follows a three-type, nonlinear birth-and-death process, in which birth rates are designed to integrate Mendelian reproduction. We are interested in the long-term genetic behavior of the population (adaptive dynamics), and in particular we compute the fixation probability of a slightly nonneutral allele in the absence of mutations, which involves finding the unique subpolynomial solution of a nonlinear three-dimensional recurrence relationship. This equation is simplified to a one-dimensional relationship which is proved to admit exactly one bounded solution. Adding rare mutations and rescaling time, we study the successive mutation fixations in the population, which are given by the jumps of a limiting Markov process on the genotypes space. At this time scale, we prove that the fixation rate of deleterious mutations increases with the number of already fixed mutations, which creates a vicious circle called the extinction vortex.

scholarly journals The infancy of supernova remnants: evolving a supernova into its remnant in 3D

2017 ◽  
Vol 12 (S331) ◽  
pp. 141-147 ◽  
Author(s):  
Michael Gabler ◽  
Hans-Thomas Janka ◽  
Annop Wongwathanarat
Keyword(s):  
Supernova Remnants ◽  
Supernova Explosion ◽  
Observational Constraints ◽  
Late Time ◽  
First Principle ◽  
Self Consistent ◽  
Supernova Explosions ◽  
Explosion Mechanism ◽  
Cas A

AbstractRecently, first neutrino-driven supernova explosions have been obtained in 3D, self-consistent, first-principle simulations, these models are still not always exploding robustly and, in general, the explosions are not sufficiently energetic. To constrain the explosion mechanism, and the related uncertainties, it is thus very helpful to consider observational constraints: pulsar kicks, progenitor association and supernova remnants (SNR). Recent observations of asymmetries in the supernova ejecta of Cas A are very promising, to compare to long-term simulations of the explosion. In addition 3D observations of SN87A are becoming more constraining on the geometry of the ejected material during the explosion. In this talk I will discuss our efforts to model the late time evolution of a 3D supernova explosion, where we include the effects of beta decay, which inflates the structures rich in 56Ni. The structures we find in the simulations depend on the quantities plotted.

Long-term evolution of the three-dimensional structure of string-fluid complex plasmas in the PK-4 experiment

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
S. Mitic ◽  
M. Y. Pustylnik ◽  
D. Erdle ◽  
A. M. Lipaev ◽  
A. D. Usachev ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Long Term Evolution ◽  
Dimensional Structure ◽  
Three Dimensional Structure ◽  
Term Evolution ◽  
Complex Plasmas
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