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The Star Formation History of the Milky Way's Nuclear Star Cluster
Zhuo Chen, Tuan Do, Andrea M. Ghez +6
We report the first star formation history study of the Milky Way's nuclear star cluster (NSC) that includes observational constraints from a large sample of stellar metallicity me…
The Impact of Initial-Final Mass Relations on Black Hole Microlensing
Sam Rose, Casey Y. Lam, Jessica R. Lu +5
Uncertainty in the initial-final mass relation (IFMR) has long been a problem in understanding the final stages of massive star evolution. One of the major challenges of constraini…
A Search for Predicted Astrometric Microlensing Events by Nearby Brown Dwarfs
Judah Luberto, Emily C. Martin, Peter McGill +3
Gravitational microlensing has the potential to provide direct gravitational masses of single, free-floating brown dwarfs, independent of evolutionary and atmospheric models. The p…
AIROPA II: Modeling Instrumental Aberrations for Off-Axis Point Spread Functions in Adaptive Optics
Anna Ciurlo, Paolo Turri, Gunther Witzel +12
Images obtained with single-conjugate adaptive optics (AO) show spatial variation of the point spread function (PSF) due to both atmospheric anisoplanatism and instrumental aberrat…
AIROPA IV: Validating Point Spread Function Reconstruction on Various Science Cases
Sean K. Terry, Jessica R. Lu, Paolo Turri +7
We present an analysis of six independent on-sky datasets taken with the Keck-II/NIRC2 instrument. Using the off-axis point spread function (PSF) reconstruction software AIROPA, we…
Measuring the Orbits of the Arches and Quintuplet Clusters using HST and Gaia: Exploring Scenarios for Star Formation Near the Galactic Center
Matthew W. Hosek, Tuan Do, Jessica R. Lu +4
We present new absolute proper motion measurements for the Arches and Quintuplet clusters, two young massive star clusters near the Galactic center. Using multi-epoch HST observati…
AIROPA III: Testing Simulated and On-Sky Data
Paolo Turri, Jessica R. Lu, Gunther Witzel +6
Adaptive optics images from the W. M. Keck Observatory have delivered numerous influential scientific results, including detection of multi-system asteroids, the supermassive black…
Searching for a Hypervelocity White Dwarf Companion: A Proper Motion Survey of SN 1006
Joshua V. Shields, Wolfgang Kerzendorf, Matthew W. Hosek +7
Type Ia Supernovae (SNe Ia) are securely understood to come from the thermonuclear explosion of a white dwarf as a result of binary interaction, but the nature of that binary inter…
Adaptive Optics Imaging Breaks the Central Caustic Cusp Approach Degeneracy in High Magnification Microlensing Events
Sean K. Terry, David P. Bennett, Aparna Bhattacharya +10
We report new results for the gravitational microlensing target OGLE-2011-BLG-0950 from adaptive optics (AO) images using the Keck observatory. The original analysis by Choi et al.…
An isolated mass gap black hole or neutron star detected with astrometric microlensing
Casey Y. Lam, Jessica R. Lu, Andrzej Udalski +42
We present the analysis of five black hole candidates identified from gravitational microlensing surveys. Hubble Space Telescope astrometric data and densely sampled lightcurves fr…
60 Microlensing Events from the Three Years of Zwicky Transient Facility Phase One
Michael S. Medford, Natasha S. Abrams, Jessica R. Lu +2
Microlensing events have historically been discovered throughout the Galactic bulge and plane by surveys designed solely for that purpose. We conduct the first multi-year search fo…