Super stellar abundances of alkali metals suggest significant migration for Hot Jupiters

@inproceedings{Hands2021SuperSA,
  title={Super stellar abundances of alkali metals suggest significant migration for Hot Jupiters},
  author={Thomas O. Hands and Ravit Helled},
  year={2021}
}
We investigate the origin of the measured over-abundance of alkali metals in the atmospheres of hot gas giants, relative to both their host stars and their atmospheric water abundances. We show that formation exterior to the water snow line followed by inward disc-driven migration results in excess accretion of oxygen-poor, refractory-rich material from within the snow-line. This naturally leads to enrichment of alkali metals in the planetary atmosphere relative to the bulk composition of its… 

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EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY