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Whether the progenitors of SNe Ia are single-degenerate or double-degeneratewhite dwarf (WD) systems is a highly debated topic. To address the origin ofthe Type Ia Tycho's supernova remnant (SNR), SN 1572, we have carried out a$^{12}$CO J=2-1 mapping and a 3-mm line survey toward the remnant using theIRAM 30 m telescope. We show that Tycho is surrounded by a clumpy molecularbubble at a local standard of rest velocity of $\sim 61$ km s$^{-1}$ whichexpands at a speed of $\sim 4.5$ km s$^{-1}$ and has a mass of $\sim 220$M$_\odot$ (at the distance of 2.5 kpc). Enhanced $^{12}$CO J=2-1 line emissionrelative to $^{12}$CO J=1-0 emission and possible line broadenings (in velocityrange $-64$ to $-60$ km s$^{-1}$) are found at the northeastern boundary of theSNR, where the shell is deformed and decelerated. These features, combined withthe morphological correspondence between the expanding molecular bubble andTycho, suggest that the SNR is associated with the bubble at the velocity range$-66$ to $-57$ km s$^{-1}$. The most plausible origin for the expanding bubbleis the fast outflow (with velocity of hundreds km s$^{-1}$) driven from thevicinity of a WD as it accreted matter from a nondegenerate companion star. TheSNR has been expanding in the low-density wind-blown bubble, and the shock wavehas just reached the molecular cavity wall. The SNR has been expanding in thelow-density wind-blown bubble, and the shock wave has just reached themolecular cavity wall. This is the first unambiguous detection of an expandingbubble driven by the progenitor of a Type-Ia SNR, which constitutes evidencefor a single-degenerate progenitor for this SN Ia.

astrophysical journal/the astrophysical journal

Expanding molecular bubble surrounding Tycho's supernova remnant (SN  1572) observed with IRAM 30 m telescope: evidence for a single-degenerate  progenitor