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The ASAS-SN Catalog of Variable Stars VII: Contact Binaries are Different Above and Below the Kraft Break
T. Jayasinghe, K. Z. Stanek, C. S. Kochanek +11
We characterize W UMa type (EW) contact binaries, including new discoveries, using ASAS-SN -band all-sky light curves along with archival data fr…
The ASAS-SN Catalog of Variable Stars V: Variables in the Southern Hemisphere
T. Jayasinghe, K. Z. Stanek, C. S. Kochanek +13
The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline ( yrs) light curves for sources brighter than V mag across the whole sky. As part…
The ASAS-SN Catalog of Variable Stars IV: Periodic Variables in the APOGEE Survey
Michal Pawlak, O. Pejcha, P. Jakubcik +12
We explore the synergy between photometric and spectroscopic surveys by searching for periodic variable stars among the targets observed by the Apache Point Observatory Galactic Ev…
An analysis of binary microlensing event OGLE-2015-BLG-0060
Y. Tsapras, A. Cassan, C. Ranc +83
We present the analysis of stellar binary microlensing event OGLE-2015-BLG-0060 based on observations obtained from 13 different telescopes. Intensive coverage of the anomalous par…
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 =…
OGLE-2016-BLG-0156: Microlensing Event With Pronounced Microlens-Parallax Effects Yielding Precise Lens Mass Measurement
Youn Kil Jung, Cheongho Han, Ian A. Bond +53
We analyze the gravitational binary-lensing event OGLE-2016-BLG-0156, for which the lensing light curve displays pronounced deviations induced by microlens-parallax effects. The li…
Discovery and Follow-up of the Unusual Nuclear Transient OGLE17aaj
M. Gromadzki, A. Hamanowicz, L. Wyrzykowski +31
We report on the discovery and follow-up of a peculiar transient, OGLE17aaj, which occurred in the nucleus of a weakly active galaxy. We investigate whether it can be interpreted a…
Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye
Łukasz Wyrzykowski, P. Mróz, K. A. Rybicki +182
Gaia16aye was a binary microlensing event discovered in the direction towards the northern Galactic disc and was one of the first microlensing events detected and alerted to by the…
The ASAS-SN Catalog of Variable Stars III: Variables in the Southern TESS Continuous Viewing Zone
T. Jayasinghe, K. Z. Stanek, C. S. Kochanek +13
The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline ( yrs) light curves for sources brighter than V mag across the whole sky. The Tran…