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The Separation Distribution of Ultra-Wide Binaries across Galactic Populations
Hai-Jun Tian, Kareem El-Badry, Hans-Walter Rix +1
We present an extensive sample of ultra-wide binary stars in the solar neighborhood, focusing on separations of . Using data from Gaia DR2, we define kinematic sub-p…
Osculating Versus Intersecting Circles in Space-Based Microlens Parallax Degeneracies
Andrew Gould
I investigate the origin of arc degeneracies in satellite microlens parallax pi_E measurements with only late time data, e.g., t > t0 + t_E as seen from the satellite. I show that…
Spitzer Microlensing parallax reveals two isolated stars in the Galactic bulge
Weicheng Zang, Yossi Shvartzvald, Tianshu Wang +90
We report the mass and distance measurements of two single-lens events from the 2017 Spitzer microlensing campaign. The ground-based observations yield the detection of finite-sour…
Spitzer Microlensing of MOA-2016-BLG-231L : A Counter-Rotating Brown Dwarf Binary in the Galactic Disk
Sun-Ju Chung, Andrew Gould, Jan Skowron +60
We analyze the binary microlensing event MOA-2016-BLG-231, which was observed from the ground and from Spitzer. The lens is composed of very low-mass brown dwarfs (BDs) with $M_1 =…