OGLE-2014-BLG-0289: Precise Characterization of a Quintuple-peak Gravitational Microlensing Event

Abstract

We present the analysis of the binary-microlensing event OGLE-2014-BLG-0289. The event light curve exhibits five very unusual peaks, four of which were produced by caustic crossings and the other by a cusp approach. It is found that the quintuple-peak features of the light curve provide tight constraints on the source trajectory, enabling us to precisely and accurately measure the microlensing parallax E p . Furthermore, the three resolved caustics allow us to measure the angular Einstein radius E q . From the combination of E p and E q , the physical lens parameters are uniquely determined. It is found that the lens is a binary composed of two M dwarfs with masses M M 0.52 0.04 1 =   and M M 0.42 0.03 2 =   separated in projection by a 6.4 0.5 au =  . The lens is located in the disk with a distance of D 3.3 0.3 kpc L =  . The reason for the absence of a lensing signal in the Spitzer data is that the time of observation corresponds to the flat region of the light curve.

OGLE-2014-BLG-0962 and a Comparison of Galactic Model Priors to Microlensing Data

“…For planetary events (defined for this purpose to be q < 0.05), we exclude stellar remnants from the Galactic models. For events with degeneracies for which the authors advocate strongly for one particular solution for θ E and π E based either on χ 2 fitness or on physical grounds (OB140289: Udalski et al 2018;OB141050: Zhu et al 2015;OB161045: Shin et al 2018;OB161190: Ryu et al 2018), we retain the favoured solutions only. Events with degeneracies yielding physical properties consistent within 1σ are assigned physical properties corresponding to the solution with the lowest χ 2 for this comparison (OB140124: Udalski et al 2015b;Beaulieu et al 2018;OB141050: Zhu et al 2015;OB150479: Han et al 2016;OB161195: Shvartzvald et al 2017).…”

Pixel level decorrelation in service of the Spitzer microlens parallax survey

“…PID 10036, 11006, 12013, 12015, 13005, 14012, PI: S. Dong; PID: 13250, PI: S. Carey; PID 14121). Following the successful 2014 pilot program, Spitzer took on a new role as a 'microlens parallax satellite' with the primary objective of measuring the Galactic distribution of exoplanets towards the bulge (Calchi Novati et al 2015a,b, 2018Shvartzvald et al 2015Shvartzvald et al , 2016Shvartzvald et al , 2017Shvartzvald et al , 2019Udalski et al 2015bUdalski et al , 2018Yee et al 2015a,b;Zhu et al 2015aZhu et al ,b, 2016Zhu et al , 2017bBozza et al 2016;Han et al 2016Han et al , 2017Han et al , 2018Poleski et al 2016;Street et al 2016;Chung et al 2017Chung et al , 2019Shin et al 2017Shin et al , 2018Albrow et al 2018;Ryu et al 2018;Wang et al 2018;Jung et al 2019;Li et al 2019;Shan et al 2019;Zang et al 2019Zang et al , 2020Gould et al 2020;Hirao et al 2020).…”

OGLE-2016-BLG-0156: Microlensing Event with Pronounced Microlens-parallax Effects Yielding a Precise Lens Mass Measurement

“…However, the extension of the trajectory crosses the upper triangular caustic, resulting in a light curve that differs greatly from the observed one. The importance of well-covered multiple peaks in determining E p was first pointed out by An & Gould (2001) and a good example was presented by Udalski et al (2018) for the quintuple-peak lensing event OGLE-2014-BLG-0289.…”