The Single-degenerate Binary Origin of Tycho's Supernova as Traced by the Stripped Envelope of the Companion
F.J. Lu, Q.D. Wang, M.Y. Ge, J.L. Qu, X.J. Yang, S.J. Zheng, and Y., Chen

TL;DR
This paper presents evidence supporting the single-degenerate binary origin of Tycho's supernova by analyzing an X-ray arc as the interaction between ejecta and the companion star's stripped envelope, providing insights into the progenitor system.
Contribution
It introduces the interpretation of an X-ray arc as the interaction with the companion's envelope, supporting the single-degenerate scenario for Tycho's supernova, and estimates key binary parameters.
Findings
Identification of an X-ray arc indicating ejecta-companion interaction
Estimated binary period of approximately 4.9 days
Stripped envelope mass around 0.0016 solar masses
Abstract
We propose that a non-thermal X-ray arc inside the remnant of Tycho's supernova (SN) represents the interaction between the SN ejecta and the companion star's envelope lost in the impact of the explosion. The X-ray emission of the remnant further shows an apparent shadow casted by the arc in the opposite direction of the explosion site, consistent with the blocking of the SN ejecta by the envelope. This scenario supports the single degenerate binary origin of Tycho's SN. The properties of the X-ray arc, together with the previous detection of the companion candidate and its space velocity by Ruiz-Lapuente et al. (2004) and Hern\'{a}ndez et al.(2009), enables us to further infer 1) the progenitor binary has a period of 4.9 days, 2) the companion gained a kick velocity of 4230 km s, and 3) the stripped envelope mass is about 0.0016() .…
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