Search for Surviving Companions of Progenitors of Young LMC Type Ia Supernova Remnants

Abstract

We have used two methods to search for surviving companions of Type Ia supernova progenitors in three Balmer-dominated supernova remnants (SNRs) in the Large Magellanic Cloud: 0519-69.0, 0505-67.9 (DEM L71), and 0548-70.4. In the first method, we use the Hubble Space Telescope photometric measurements of stars to construct color-magnitude diagrams (CMDs), and compare positions of stars in the CMDs with those expected from theoretical post-impact evolution of surviving main sequence or helium star companions. No obvious candidates of surviving companion are identified in this photometric search. Future models for surviving red giant companions or with different explosion mechanisms are needed for thorough comparisons with these observations in order to make more definitive conclusions. In the second method, we use Multi-Unit Spectroscopic Explorer (MUSE) observations of 0519-69.0 and DEM L71 to carry out spectroscopic analyses of stars in order to use large peculiar radial velocities as diagnostics of surviving companions. We find a star in 0519-69.0 and a star in DEM L71 moving at radial velocities of 182 $\pm$ 0 km s${}^{-1}$ and 213 $\pm$ 0 km s${}^{-1}$, more than 2.5$\sigma$ from the mean radial velocity of the underlying stellar population, 264 km s${}^{-1}$ and 270 km s${}^{-1}$, respectively. These stars need higher-quality spectra to investigate their abundances and rotation velocities to determine whether they are indeed surviving companions of the SN progenitors.

25 pages, 9 tables, 22 figures, accepted for publication in The Astrophysical Journal (ApJ)

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• No Surviving SN Ia Companion In SNR 0509-67.5: Stellar Population Characterization and Comparison To Models
• Forbidden Line Emission from Type Ia Supernova Remnants Containing Balmer-Dominated Shells
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• Searching for Balmer-dominated Type Ia Supernova Remnants in M33
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• Supersoft X-Ray Nebulae in the Large Magellanic Cloud
• Searching for Surviving Companion in the Young SMC Supernova Remnant 1E 0102.2-7219