Speaker
Description
We explore the gravitational heating of exoplanetary systems by dark matter substructures of different kinds (primordial black holes -- PBHs, ultra-compact -- UCMHs, or classical subhalos). In this context, the scales of the dark objects probed are of the same order as the orbital radii of planets of interest. Distant exoplanets are quite sensitive to heating processes because less bound to their stars, and a typical signature of the presence of Galactic dark objects would be multi-planets systems with increasing inclination with increasing planetary distance to the stars, up to full ejection of the most distant ones. This allows us to set new upper bounds on the abundance of PBHs and UMCHs in the mass range $10-10^8$M$_\odot$, translating into bounds on the amplitude of the primordial power spectrum in the wavenumber range $10-1000$Mpc$^{-1}$.
