Limits on planets around pulsating white dwarf stars

作者：Mullally Fergal^*; Winget D E; Degennaro Steven; Jeffery Elizabeth; Thompson S E; Chandler Dean; Kepler S O

来源：Astrophysical Journal, 2008, 676(1): 573-583.

DOI：10.1086/528672

• planetary systems
• white dwarfs

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 2M(J) 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.

• 出版日期2008-3-20