SIMBAD references

2019ApJ...882..120W - Astrophys. J., 882, 120-120 (2019/September-2)

The cold and dusty circumstellar matter around fast-expanding Type Ia supernovae.

WANG X., CHEN J., WANG L., HU M., XI G., YANG Y., ZHAO X. and LI W.

Abstract (from CDS):

SNe Ia play key roles in revealing the accelerating expansion of the universe, but our knowledge of their progenitors is still very limited. Here we report the discovery of a rigid dichotomy in circumstellar (CS) environments around two subclasses of SNe Ia as defined by their distinct photospheric velocities. For the SNe Ia with high photospheric velocities (HVs), we found a significant excess flux in blue light 60-100 days past maximum, while this phenomenon is absent for SNe with normal photospheric velocity. This blue excess can be attributed to light echoes by circumstellar dust located at a distance of about (1-2) x 1017 cm from the HV subclass. Moreover, we also found that the HV SNe Ia show systematically evolving Na I absorption line by performing a systematic search of variable Na I absorption lines in spectra of all SNe Ia, whereas this evolution is rarely seen in normal ones. The evolving Na I absorption can be modeled in terms of photoionization model, with the location of the gas clouds at a distance of about 2 x 1017 cm, in striking agreement with the location of CS dust inferred from B-band light-curve excess. These observations show clearly that the progenitors of HV subclass are likely from single-degenerate progenitor system (i.e., symbiotic binary), while the NV subclass may arise from double-degenerate system.

Abstract Copyright: © 2019. The American Astronomical Society.

Journal keyword(s): binaries: symbiotic - scattering - stars: circumstellar matter - supernovae: general

VizieR on-line data: <Available at CDS (J/ApJ/882/120): table1.dat>

Simbad objects: 210

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2021.12.02-08:54:13

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