Formation of undermassive single white dwarfs and the influence of planets on late stellar evolution

Details Formation of undermassive single white dwarfs and the influence of planets on late stellar evolution Formation of undermassive single white dwarfs and the influence of planets on late stellar evolution

1998-05-31

arxiv.org/abs/astro-ph/9806011v1

A&A 335 (1998) L85-L88

Astronomy and Astrophysics

Astrophysics

4 pages, accepted for publication in A&A letters

Scientific paper

We propose a scenario to form low-mass, single, slow rotating white dwarfs from a solar-like star accompanied by a massive planet, or a brown dwarf, in a relatively close orbit (e.g. HD 89707). Such white dwarfs were recently found by Maxted & Marsh (1998). When the solar-like star ascends the giant branch it captures the planet and the subsequent spiral-in phase expels the envelope of the giant leaving a low-mass helium white dwarf remnant. In case the planet evaporizes, or fills its own Roche-lobe, the outcome is a single undermassive white dwarf. The observed distribution of planetary systems supports the applicability of this scenario.

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