X-ray observations of the nova shell IPHASX J210204.7+471015

Abstract

We present the analysis of XMM-Newton European Photon Imaging Camera (EPIC) observations of the nova shell IPHASX J210204.7$+$471015. We detect X-ray emission from the progenitor binary star with properties that resemble those of underluminous intermediate polars such as DQ Her: an X-ray-emitting plasma with temperature of $T_{\mathrm{X}}=(6.4\pm 3.1)\times 10^6$ K, a non-thermal X-ray component, and an estimated X-ray luminosity of $L_{\mathrm{X}}=10^{30}$ erg s${}^{-1}$. Time series analyses unveil the presence of two periods, the dominant with a period of $2.9\pm 0.2$ hr, which might be attributed to the spin of the white dwarf, and a secondary of $4.5\pm 0.6$ hr that is in line with the orbital period of the binary system derived from optical observations. We do not detect extended X-ray emission as in other nova shells probably due to its relatively old age (130-170 yr) or to its asymmetric disrupted morphology which is suggestive of explosion scenarios different to the symmetric ones assumed in available numerical simulations of nova explosions.

arXiv comment6 pages and 5 Figures; Accepted to MNRAS

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