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We propose that a non-thermal X-ray arc inside the remnant of Tycho'ssupernova (SN) represents the interaction between the SN ejecta and thecompanion star's envelope lost in the impact of the explosion. The X-rayemission of the remnant further shows an apparent shadow casted by the arc inthe opposite direction of the explosion site, consistent with the blocking ofthe SN ejecta by the envelope. This scenario supports the single degeneratebinary origin of Tycho's SN. The properties of the X-ray arc, together with theprevious detection of the companion candidate and its space velocity byRuiz-Lapuente et al. (2004) and Hern\'{a}ndez et al.(2009), enables us tofurther infer 1) the progenitor binary has a period of 4.9$^{+5.3}_{-3.0}$days, 2) the companion gained a kick velocity of 42$\pm$30 km s$^{-1}$, and 3)the stripped envelope mass is about 0.0016($\leq0.0083$) $M_{\sun}$. However,we notice that the nature of the companion candidate is still under debate, andthe above parameters need to be revised according to the actual properties ofthe companion candidate. Further work to measure the proper motion of the arcand to check the capability of the interaction to emit the amount of X-raysobserved from the arc is also needed to validate the current scenario.

The Single-degenerate Binary Origin of Tycho's Supernova as Traced by the Stripped Envelope of the Companion