Dynamics of Fe-Ni Bubbles in Young Supernova Remnants

Abstract

Observations of core-collapse supernovae (SNe) have revealed the presence of extensive mixing of radioactive material in SN ejecta. The mixing of radioactive material, mostly freshly synthesized Ni, is not complete, which leads to a two-phase SN ejecta structure. The low-density phase consists of Fe bubbles, created by the energy input from radioactive Co and Ni, surrounded by compressed high-density metal-rich ejecta. We report on the theoretical investigation of supernova remnant (SNR) dynamics with the two-phase SN ejecta. We first present 3-dimensional hydrodynamic simulations of a single Fe bubble immersed in an outer ejecta envelope, and compare the results with previous work on shock-cloud interactions. We then consider randomly distributed Fe bubbles with an average volume filling fraction of 1/2. We find that the presence of Fe bubbles leads to vigorous turbulence and mixing of Fe with other heavy elements and with the ambient normal-abundance gas. The turbulent energy can be an order of magnitude larger than in the case of smooth ejecta. A significant fraction of the shocked ejecta is found in narrow filaments and clumps moving with radial velocities larger than the velocity of the forward shock. Observational consequences of the two-phase ejecta on SNR X-ray spectra and images are briefly mentioned.

20 pages, 12 figures, submitted to Astrophysical Journal

References in corpus (4)

• Nucleosynthesis and Mixing in Cassiopeia A
• Nucleosynthesis and Clump Formation in a Core Collapse Supernova
• Instabilities and Clumping in Type Ia Supernova Remnants
• Mapping the X-ray Emitting Ejecta in Cassiopeia A with Chandra

Cited by in corpus (36)

• On the Determination of Ejecta Structure and Explosion Asymmetry from the X-ray Knots of Cassiopeia A
• Rayleigh-Taylor Instabilities in Young Supernova Remnants Undergoing Efficient Particle Acceleration
• The distribution of radioactive ${}^{44}$Ti in Cassiopeia A
• A Detailed Kinematic Map of Cassiopeia A's Optical Main Shell and Outer High-Velocity Ejecta
• Modeling SNR Cassiopeia A from the Supernova Explosion to its Current Age: The role of post-explosion anisotropies of ejecta
• Where was the Iron Synthesized in Cassiopeia A?
• The Bubble-like Interior of the Core-Collapse Supernova Remnant Cassiopeia A
• Hubble Space Telescope WFPC-2 Imaging of Cassiopeia A
• Detonating Failed Deflagration Model of Thermonuclear Supernovae I. Explosion Dynamics
• Bullets in a Core Collapse Supernova Remnant: The Vela Remnant
• Thermal X-Ray Emission from Shocked Ejecta in Type Ia Supernova Remnants II: Parameters Affecting the Spectrum
• The Radial Structure of SNR N103B
• Chandra Spatially Resolved Spectroscopic Study and Multi-Wavelength Imaging of the Supernova Remnant 3C 397 (G41.1-0.3)
• The Density and Mass of Unshocked Ejecta in Cassiopeia A through Low Frequency Radio Absorption
• The infancy of core-collapse supernova remnants
• A JWST Survey of the Supernova Remnant Cassiopeia A
• Numerical Models of Viscous Accretion Flows Near Black Holes
• Three-dimensional numerical investigations of the morphology of type Ia SNRs
• [Fe II] and H2 filaments in the Supernova Remnant G11.2-0.3: Supernova Ejecta and Presupernova Circumstellar Wind
• X-ray Line Emission from Supernova Ejecta Fragments
• High-entropy ejecta plumes in Cassiopeia A from neutrino-driven convection
• A Comparison of X-ray and Optical Emission in Cassiopeia A
• JWST NIRSpec observations of Supernova 1987A -- from the inner ejecta to the reverse shock
• Spectropolarimetry of the Type Ib Supernova iPTF 13bvn: Revealing the complex explosion geometry of a stripped-envelope core-collapse supernova
• The Morphologies and Kinematics of Supernova Remnants
• Spectrum and Composition of Ultra-high Energy Cosmic Rays from Semi-relativistic Hypernovae
• 3D mapping of the Crab Nebula with SITELLE. I. Deconvolution and kinematic reconstruction
• The Effect of a Cosmic Ray Precursor in SN 1006?
• Clumps and rings of ejecta in SNR 0540-69.3 as seen in 3D
• Near-Infrared Knots and Dense Fe Ejecta in the Cassiopeia A Supernova Remnant
• A Decade-Baseline Study of the Plasma States of Ejecta Knots in Cassiopeia A
• Thermal and Nonthermal Emission from the Forward Shock in Tycho's Supernova Remnant
• Using Anisotropies as a Forensic Tool for Decoding Supernova Remnants
• The Formation of Broad Emission Line Regions in Supernova-QSO Wind Interactions II. 2D Calculations
• Near-Infrared Spectroscopy of Dense Ejecta Knots in the Outer Eastern Area of the Cassiopeia A Supernova Remnant
• The forward and reverse shock dynamics of Cassiopeia A