OGLE-2015-BLG-1482l: The first isolated low-mass microlens in the galactic bulge
The Astrophysical Journal, 2017•iopscience.iop.org
We analyze the single microlensing event OGLE-2015-BLG-1482 simultaneously observed
from two ground-based surveys and from Spitzer. The Spitzer data exhibit finite-source
effects that are due to the passage of the lens close to or directly over the surface of the
source star as seen from Spitzer. Such finite-source effects generally yield measurements of
the angular Einstein radius, which when combined with the microlens parallax derived from
a comparison between the ground-based and the Spitzer light curves yields the lens mass …
from two ground-based surveys and from Spitzer. The Spitzer data exhibit finite-source
effects that are due to the passage of the lens close to or directly over the surface of the
source star as seen from Spitzer. Such finite-source effects generally yield measurements of
the angular Einstein radius, which when combined with the microlens parallax derived from
a comparison between the ground-based and the Spitzer light curves yields the lens mass …
Abstract
We analyze the single microlensing event OGLE-2015-BLG-1482 simultaneously observed from two ground-based surveys and from Spitzer. The Spitzer data exhibit finite-source effects that are due to the passage of the lens close to or directly over the surface of the source star as seen from Spitzer. Such finite-source effects generally yield measurements of the angular Einstein radius, which when combined with the microlens parallax derived from a comparison between the ground-based and the Spitzer light curves yields the lens mass and lens-source relative parallax. From this analysis, we find that the lens of OGLE-2015-BLG-1482 is a very low-mass star with a mass $0.10\pm 0.02\{M} _ {\odot} $
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