Type Ia Supernova Remnants: Shaping by Iron Bullets

Abstract

Using 2D numerical hydrodynamical simulations of type Ia supernova remnants (SNR Ia) we show that iron clumps few times denser than the rest of the SN ejecta might form protrusions in an otherwise spherical SNR. Such protrusions exist in some SNR Ia, e.g., SNR 1885 and Tycho. Iron clumps are expected to form in the deflagration to detonation explosion model. In SNR Ia where there are two opposite protrusions, termed ears, such as Kepler's SNR and SNR G1.9+0.3, our scenario implies that the dense clumps, or iron bullets, were formed along an axis. Such a preferred axis can result from a rotating white dwarf progenitor. If our claim holds, this offers an important clue to the SN Ia explosion scenario.

7 pages, 5 figures. Accepted to MNRAS

References in corpus (12)

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Cited by in corpus (13)

• Modeling SNR Cassiopeia A from the Supernova Explosion to its Current Age: The role of post-explosion anisotropies of ejecta
• Supernovae Ia in 2019 (review): a rising demand for spherical explosions
• An investigation of ${}^{56}$Ni shells as the source of early light curve bumps in type Ia supernovae
• The Origin of the Iron-Rich Knot in Tycho's Supernova Remnant
• "Ears" formation in Supernova Remnants: Overhearing an interaction history with bipolar circumstellar structures
• Asymmetric Expansion of the Youngest Galactic Supernova Remnant G1.9+0.3
• The sculpting of rectangular and jet-like morphologies in supernova remnants by anisotropic equatorially-confined progenitor stellar winds
• Discovery of Double-Ring Structure in the Supernova Remnant N103B: Evidence for Bipolar Winds from a Type Ia Supernova Progenitor
• 3D modeling from the onset of the SN to the full-fledged SNR: Role of an initial ejecta anisotropy on matter mixing
• Interstellar Meteors are Outliers in Material Strength
• X-ray emitting structures in the Vela SNR: ejecta anisotropies and progenitor stellar wind residuals
• Narrow Transient Absorptions in Late-Time Optical Spectra of Type Ia Supernovae: Evidence for Large Clumps of Iron-Rich Ejecta?
• Near-Infrared Spectroscopy of Dense Ejecta Knots in the Outer Eastern Area of the Cassiopeia A Supernova Remnant