We show that microlensing event KMT-2016-BLG-1107 displays a new type of degeneracy between wide-binary and close-binary Hollywood events in which a giant-star source envelops the planetary caustic .
The planetary anomaly takes the form of a smooth , two-day “ bump ” far out on the falling wing of the light curve , which can be interpreted either as the source completely enveloping a minor-image caustic due to a close companion with mass ratio q = 0.036 , or partially enveloping a major-image caustic due to a wide companion with q = 0.004 .
The best estimates of the companion masses are both in the planetary regime ( 3.3 ^ { +3.5 } _ { -1.8 } M _ { jup } and 0.090 ^ { +0.096 } _ { -0.037 } M _ { jup } ) but differ by an even larger factor than the mass ratios due to different inferred host masses .
We show that the two solutions can be distinguished by high-resolution imaging at first light on next-generation ( “ 30m ” ) telescopes .
We provide analytic guidance to understand the conditions under which this new type of degeneracy can appear .