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Mass Measurements of Isolated Objects from Space-based Microlensing
- Publication Year :
- 2015
-
Abstract
- We report on the mass and distance measurements of two single-lens events from the 2015 \emph{Spitzer} microlensing campaign. With both finite-source effect and microlens parallax measurements, we find that the lens of OGLE-2015-BLG-1268 is very likely a brown dwarf. Assuming that the source star lies behind the same amount of dust as the Bulge red clump, we find the lens is a $45\pm7$ $M_{\rm J}$ brown dwarf at $5.9\pm1.0$ kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a $0.50\pm0.04$ $M_\odot$ star at $6.9\pm1.0$ kpc. We show that the probability to definitively measure the mass of isolated microlenses is dramatically increased once simultaneous ground- and space-based observations are conducted.<br />Comment: 10 papers, 4 figures, 2 tables; ApJ in press
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1510.02097
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.3847/0004-637X/825/1/60