Edasich dK star
Number of posts : 2285 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: An Eccentric Planet Orbiting the Polar V808 Aurigae 28th February 2024, 4:40 am | |
| A new planet orbiting a cataclysmic variable An Eccentric Planet Orbiting the Polar V808 Aurigae - Quote :
- We analyze 15 years of eclipse timings of the polar V808 Aur. The rapid ingress/egress of the white dwarf and bright accretion region provide timings as precise as a few tenths of a second for rapid cadence photometric data. We find that between 2015 and 2018, the eclipse timings deviated from a linear ephemeris by more than 30 s. The rapid timing change is consistent with the periastron passage of a planet in an eccentric orbit about the polar. The best fit orbital period is 11±1 yr and we estimate a projected mass of Msin(i)=6.8±0.7 Jupiter masses. We also show that the eclipse timings are correlated with the brightness of the polar with a slope of 1.1 s/mag. This is likely due to the change in the geometry of the accretion curtains as a function of the mass transfer rate in the polar. While an eccentric planet offers an excellent explanation to the available eclipse data for V808 Aur, proposed planetary systems in other eclipsing polars have often struggled to accurately predict future eclipse timings.
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