A First Look at a Short Period, Extremely Deep-Eclipsing Polar

Details A First Look at a Short Period, Extremely Deep-Eclipsing Polar A First Look at a Short Period, Extremely Deep-Eclipsing Polar

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop..141c&link_type=abstract

XMM-Newton Proposal ID #06734201

Computer Science

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Lsq 172554.8-64

Scientific paper

We request exploratory follow-up of a new short period (95 min.), white dwarf binary, likely a polar with no accretion disk, that shows one of the deepest optical eclipses known (>5.7 mag). Such binaries are rare but valuable as the system's inclination is strongly constrained; high time-resolution spectrophotometry, especially in and out of eclipse, allows "tomography" of the accretion flow and direct measurement of the radii of the white dwarf and its companion. This system shows no J band eclipse, i.e., it must have an unusually cool, low mass secondary, an M8+ dwarf. This combined with the short period suggests we may have a magnetic "period bouncer," a late binary evolutionary stage theoretically predicted to be common but difficult to detect in practice.

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