Limits on Planets around Pulsating White Dwarf Stars

Details Limits on Planets around Pulsating White Dwarf Stars Limits on Planets around Pulsating White Dwarf Stars

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...676..573m&link_type=abstract

The Astrophysical Journal, Volume 676, Issue 1, pp. 573-583.

Astronomy and Astrophysics

Astronomy

39

Stars: Planetary Systems, Stars: White Dwarfs

Scientific paper

We present limits on planetary companions to pulsating white dwarf stars. A subset of these stars exhibit extreme stability in the period and phase of some of their pulsation modes; a planet can be detected around such a star by searching for periodic variations in the arrival time of these pulsations. We present limits on companions greater than a few Jupiter masses around a sample of 15 white dwarf stars as part of an ongoing survey. One star shows a variation in arrival time consistent with a 2MJ planet in a 4.5 yr orbit. We discuss other possible explanations for the observed signal and conclude that a planet is the most plausible explanation based on the data available.

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