Gas phase ions in protoplanetary discs from collisions of solids
Ionization is important for magnetohydrodynamics and chemistry in protoplanetary discs but known ionization sources are often weak along the mid-plane. We present, for the first time, data from a laboratory experiment, where we measure ions from colliding mm-basalt grains emitted into the surrounding gas phase. This positive detection implies that very basic collisions in early phases of planet formation are sources of ionization. The mid-plane of protoplanetary discs might be ionized despite the lack of intense radiation sources.
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