On the survival of brown dwarfs and planets engulfed by their giant host star

Abstract

The recent discovery of two Earth-mass planets in close orbits around an evolved star has raised questions as to whether substellar companions can survive encounters with their host stars. We consider whether these companions could have been stripped of significant amounts of mass during the phase when they orbited through the dense inner envelopes of the giant. We apply the criterion derived by Murray et al. for disruption of gravitationally bound objects by ram pressure, to determine whether mass loss may have played a role in the histories of these and other recently discovered low-mass companions to evolved stars. We find that the brown dwarf and Jovian mass objects circling WD 0137-349, SDSS J08205+0008, and HIP 13044 are most unlikely to have lost significant mass during the common envelope phase. However, the Earth-mass planets found around KIC 05807616 could well be the remnant of one or two Jovian mass planets that lost extensive mass during the common envelope phase.

6 pages, 2 figures, 2 tables, accepted for publication in ApJ Letters

References in corpus (8)

• Modules for Experiments in Stellar Astrophysics (MESA)
• An AMR Study of the Common Envelope Phase of Binary Evolution
• Simulating the Common Envelope Phase of a Red Giant Using SPH and Uniform Grid Codes
• Survival of a brown dwarf after engulfment by a red giant star
• The Interaction of Stellar Objects within a Common Envelope
• A Giant Planet Around a Metal-poor Star of Extragalactic Origin
• A tidally destructed massive planet as the progenitor of the two light planets around the sdB star KIC 05807616
• Possible Implications of the Planet Orbiting the Red Horizontal Branch Star HIP 13044

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