SIMBAD references

2019AJ....157...23H - Astron. J., 157, 23-23 (2019/January-0)

KMT-2016-BLG-1107: a new hollywood-planet close/wide degeneracy.

HWANG K.-H., RYU Y.-H., KIM H.-W., ALBROW M.D., CHUNG S.-J., GOULD A., HAN C., JUNG Y.K., SHIN I.-G., SHVARTZVALD Y., YEE J.C., ZANG W., CHA S.-M., KIM D.-J., KIM S.-L., LEE C.-U., LEE D.-J., LEE Y., PARK B.-G. and POGGE R.W.

Abstract (from CDS):

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 (3.3–1.8+3.5Mjup and 0.090–0.037+0.096Mjup) 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 ("30 m") telescopes. We provide analytic guidance to understand the conditions under which this new type of degeneracy can appear.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): gravitational lensing: micro

Simbad objects: 6

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