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Luminous debris disks of warm dust in the terrestrial planet zones aroundsolar-like stars are recently found to vary, indicative of ongoing large-scalecollisions of rocky objects. We use Spitzer 3.6 and 4.5 {\mu}m time-seriesobservations in 2012 and 2013 (extended to 2014 in one case) to monitor 5 moredebris disks with unusually high fractional luminosities ("extreme debrisdisk"), including P1121 in the open cluster M47 (80 Myr), HD 15407A in the ABDor moving group (80 Myr), HD 23514 in the Pleiades (120 Myr), HD 145263 in theUpper Sco Association (10 Myr), and the field star BD+20 307 (>1 Gyr). Togetherwith the published results for ID8 in NGC 2547 (35 Myr), this makes the firstsystematic time-domain investigation of planetary impacts outside the solarsystem. Significant variations with timescales shorter than a year are detectedin five out of the six extreme debris disks we have monitored. However,different systems show diverse sets of characteristics in the time domain,including long-term decay or growth, disk temperature variations, and possibleperiodicity.

Planetary Collisions outside the Solar System: Time Domain Characterization of Extreme Debris Disks