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The Formation of Systems with Tightly-packed Inner Planets (STIPs) via Aerodynamic Drift
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The NASA Kepler mission has revealed an abundant class of Systems with Tightly-packed Inner Planets (STIPs). The current paradigm for planet formation suggests that small planetesimals will quickly spiral into the host star due to aerodynamic drag, preventing rocky planet formation. In contrast, we find that aerodynamic drift, when acting on an ensemble of solids, can concentrate mass at short orbital periods in gaseous disks. Sublimation fronts may further aid this process. Kepler data suggest that the innermost known planets are found near the silicate sublimation zone. STIP planets should have a wide range of volatile fractions due to aerodynamic drift and H2 dissociation-driven gas accretion. We further propose that the low mass of Mars is evidence that the Solar System was once a proto-STIP.
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Cited by 2 Pith papers
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Small and Close-In Planets are Uncommon Around A-type Stars
No small (1-8 Earth radii) planets with orbits under 10 days were found around 20,257 A-type stars, yielding 3-sigma upper limits below occurrence rates for Sun-like stars.
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Planetary Edge Trends (PET). I. The Inner Edge-Stellar Mass Correlation
The inner edge of small-planet systems scales with stellar mass as a power law with index roughly 0.6 to 1.1 after metallicity correction, best matching the pre-main-sequence dust sublimation radius.
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