Rotational variability of earth's polar regions: Implications for detecting snowball planets

Nicolas B. Cowan, Tyler Robinson, Timothy A. Livengood, Drake Deming, Eric Agol, Michael F. A'Hearn, David Charbonneau, Carey M. Lisse, Victoria S. Meadows, Sara Seager, Aomawa L. Shields, Dennisd Wellnitz