Stellar Evolution with Enriched Surface Convection Zones I. General Effects of Planet Consumption

Abstract

Abundance analyses of stars with planets have revealed that their metallicities are enhanced relative to field stars. Such a trend was originally suggested to be due to accretion of iron-rich planetary material. Based on this assumption, we have developed a stellar evolution code to model stars with non-uniform metallicity distributions. We have calculated ``polluted'' stellar evolution tracks for stars with M=0.9-1.2 M_sun. Our models encompass a range of initial metal content from Z=0.01 to 0.03, and include metallicity enhancements within the stellar convection zone corresponding to Delta-Z=0.005-0.03. We find that the primary effects of metal enhancement on stellar structure and evolution are expansion of the convection zone and downward shift of effective temperature. In addition, we have computed the surface metallicities expected for stars of different mass for fixed quantities of pollution; there appears to be no correlation with present observational data on the metallicities of stars known to harbor planets.

29 pages, 10 figures, accepted for publication by the Astrophysical Journal; one reference corrected

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Cited by in corpus (10)

• Structure and Evolution of Nearby Stars with Planets II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog
• The Chemical Compositions of Stars with Planets: A Review
• Signatures of rocky planet engulfment in HAT-P-4. Implications for chemical tagging studies
• Detailed chemical compositions of the wide binary HD 80606/80607: revised stellar properties and constraints on planet formation
• Observational Signatures of Self-Destructive Civilisations
• Optical-infrared flares and radio afterglows by Jovian planets inspiraling into their host stars
• Extent of pollution in planet-bearing stars
• Accretion of chemically fractionated material on a wide binary with a blue straggler
• Astrophysics in 2005
• Evolution of the ZTF SLRN-2020 star-planet merger