Orbital Period Changes for Fourteen Novae and the Critical Failures of the Predictions of Standard Theories, the Hibernation Model, and the Magnetic Braking Model
| Autor: | Schaefer, Bradley E. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stad2223 |
| Popis: | The evolution of novae and Cataclysmic Variables (CVs) is driven by changes in the binary orbital periods. In a direct and critical test for various evolution models and their physical mechanisms, I measure the sudden changes in the period ($\Delta P$) across 14 nova eruptions and I measure the steady period change during quiescence ($\dot{P}$) for 20 inter-eruption intervals. The standard theory for $\Delta P$ is dominated by the mechanism of mass loss, and this fails completely for the five novae with negative values, and it fails to permit the $\Delta P$ for U Sco eruptions to change by one order-of-magnitude from eruption-to-eruption. The Hibernation Model of evolution is refuted because all the $\Delta P$ measures are orders of magnitude too small to cause any significant drop in accretion luminosity, and indeed, near half of the nova have negative $\Delta P$ as the opposite of the required mechanism for any hibernation state. As for the Magnetic Braking Model, this fails by many orders-of-magnitude in its predictions of the required $\dot{P}$ for 9-out-of-13 novae. The observed $\dot{P}$ values scatter, both positively and negatively, over a range of $\pm$10$^{-9}$, while the predicted values are from $-$10$^{-13}$ to $-$10$^{-11}$. This huge scatter is not possible with standard theory, and there must be some currently-unknown mechanism to be added in, with this new mechanism 100--10000$\times$ larger in effect than the current theory allows. In all, these failed predictions demonstrate that nova systems must have unknown physical mechanisms for both $\Delta P$ and $\dot{P}$ that dominate over all other effects. Comment: MNRAS in press, see MNRAS webpage for published version and for the Supplementary Materials |
| Databáze: | arXiv |
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