Orbital Period Changes of Recurrent Nova T Pyxidis Demonstrate that M_ejecta >> 11.3xM_accreted and Is Not a Type Ia Supernova Progenitor

Recurrent nova (RN) T Pyxidis (T Pyx) has a complex history of mass accreting-onto and ejection-from the white dwarf, with a classical nova eruption around 1866 kick-starting a RN-phase with six RN eruptions from 1890–2011. T Pyx is a primary progenitor candidate for Type Ia supernovae (SNIa). This is chiefly a question of whether the mass accreted by the white dwarf ($M_{\mathrm{a}\mathrm{c}\mathrm{c}\mathrm{r}\mathrm{e}\mathrm{t}\mathrm{e}\mathrm{d}}$) is more-or-less than the mass ejected by the nova eruptions ($M_{\mathrm{e}\mathrm{j}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{a}}$) over the entire eruption cycle. Prior attempts to measure $M_{\mathrm{e}\mathrm{j}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{a}}$ from the traditional methods have a scatter of $>$130$\times$, so only a new technique can provide a measure of adequate accuracy and reliability. This new technique is the timing experiment of measuring the orbital period from 1986 to 2025, where the period increased by $+$50.3$\pm$7.9 parts-per-million across the 2011 eruption. With simple and sure physics, the best estimate for the mass ejected by one RN event is $>$2400$\times$10${}^{-7}$ M${}_{\odot }$, with an extreme inviolate limit of $\gg$354$\times$10${}^{-7}$ M${}_{\odot }$. Over all eruptions in a cycle, $M_{ejecta}$$>$17120$\times$10${}^{-7}$ M${}_{\odot }$, with an inviolate limit of $M_{ejecta}$$\gg$2144$\times$10${}^{-7}$ M${}_{\odot }$. Over the full eruption cycle, the white dwarf accreted 220$\times$10${}^{-7}$ M${}_{\odot }$. So M${}_{\mathrm{e}\mathrm{j}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{a}}$$\gg$11.3$\times$M${}_{\mathrm{a}\mathrm{c}\mathrm{c}\mathrm{r}\mathrm{e}\mathrm{t}\mathrm{e}\mathrm{d}}$, and T Pyx can never become a SNIa. This paper is the seventh in a series proving that each of various popular candidate SNIa progenitors cannot possibly evolve to a supernova; including V445 Pup, U Sco, T CrB, all symbiotic stars, FQ Cir, V1405 Cas, and now T Pyx.