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• W2010381531 endingPage "121" @default.
• W2010381531 startingPage "121" @default.
• W2010381531 abstract "The search for planets around white dwarf stars, and evidence for dynamical instability around them in the form of atmospheric pollution and circumstellar disks, raises questions about the nature of planetary systems that can survive the vicissitudes of the asymptotic giant branch (AGB). We study the competing effects, on planets at several AU from the star, of strong tidal forces arising from the star's large convective envelope, and of the planets' orbital expansion due to stellar mass loss. We study, for the first time, the evolution of planets while following each thermal pulse on the AGB. For Jovian planets, tidal forces are strong, and can pull into the envelope planets initially at ∼3 AU for a 1 M☉ star and ∼5 AU for a 5 M☉ star. Lower-mass planets feel weaker tidal forces, and terrestrial planets initially within 1.5–3 AU enter the stellar envelope. Thus, low-mass planets that begin inside the maximum stellar radius can survive, as their orbits expand due to mass loss. The inclusion of a moderate planetary eccentricity slightly strengthens the tidal forces experienced by Jovian planets. Eccentric terrestrial planets are more at risk, since their eccentricity does not decay and their small pericenter takes them inside the stellar envelope. We also find the closest radii at which planets will be found around white dwarfs, assuming that any planet entering the stellar envelope is destroyed. Planets are in that case unlikely to be found inside ∼1.5 AU of a white dwarf with a 1 M☉ progenitor and ∼10 AU of a white dwarf with a 5 M☉ progenitor." @default.
• W2010381531 created "2016-06-24" @default.
• W2010381531 creator A5018451831 @default.
• W2010381531 creator A5071774310 @default.
• W2010381531 date "2012-12-04" @default.
• W2010381531 modified "2023-10-15" @default.
• W2010381531 title "FORETELLINGS OF RAGNARÖK: WORLD-ENGULFING ASYMPTOTIC GIANTS AND THE INHERITANCE OF WHITE DWARFS" @default.
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• W2010381531 doi "https://doi.org/10.1088/0004-637x/761/2/121" @default.
• W2010381531 hasPublicationYear "2012" @default.
• W2010381531 type Work @default.

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