Free Astronomy Lecture: ExoComets | Presidio
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Observation Post at the Presidio | 211 Lincoln Boulevard, San Francisco, CA
Tuesday, December 19, 2017
Free Astronomy Lecture | Presidio
ExoComets: Now You See Them, Now You Don’t
Featured Speaker: Barry Welsh, PhD, UC Berkeley, Space Sciences Laboratory
Minor bodies such as Kuiper Belt Objects, comets and asteroids constitute the rocky, icy debris left over from the planet-building phase of our solar system. The existence of reservoirs of small rocky bodies in orbit around young stellar systems is now well established. The initial protoplanetary disks that contain the reservoir of dust and gas required to form exoplanets are short-lived. The circumstellar debris disk observed around young stars of ages 10-50 Myr are continually replenished by collision and evaporation amongst planetesimals. The gravitational field can potentially enable large numbers of kilometer-sized icy bodies into trajectories directed toward the young central star.
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