IPHAS J062746.41+014811.3: a deeply eclipsing intermediate polar

TL;DR

This paper reports the discovery and detailed characterization of IPHAS J062746.41+014811.3, a deeply eclipsing intermediate polar with unique properties, including its orbital and spin periods, magnetic moment, and multi-wavelength emission features.

Contribution

It is the first detailed study of this deeply eclipsing intermediate polar, revealing its periods, magnetic properties, and multi-wavelength emission, expanding knowledge of such systems.

Findings

Orbital period of 8.16 hours and spin period of 2210 seconds.

System shows brightness variations and eclipse profile changes.

X-ray and ultraviolet observations confirm intermediate polar nature.

Abstract

We present time-resolved photometry of a cataclysmic variable discovered in the Isaac Newton Telescope Photometric Halpha Survey of the northern galactic plane, IPHAS J062746.41+014811.3 and classify the system as the fourth deeply eclipsing intermediate polar known with an orbital period of Porb=8.16 h, and spin period of Pspin=2210 s. The system shows mild variations of its brightness, that appear to be accompanied by a change in the amplitude of the spin modulation at optical wavelengths, and a change in the morphology of the eclipse profile. The inferred magnetic moment of the white dwarf is mu_wd = 6-7 x 10^33 Gcm^3, and in this case IPHAS J0627 will either evolve into a short-period EX Hya-like intermediate polar with a large Pspin\Porb ratio, or, perhaps more likely, into a synchronised polar. Swift observations show that the system is an ultraviolet and X-ray source, with a hard X-ray spectrum that is consistent with those seen in other intermediate polars. The ultraviolet light curve shows orbital modulation and an eclipse, while the low signal-to-noise ratio X-ray light curve does not show a significant modulation on the spin period. The measured X-ray flux is about an order of magnitude lower than would be expected from scaling by the optical fluxes of well-known X-ray selected intermediate polars.