UKIRT MICROLENSING SURVEYS AS A PATHFINDER FOR WFIRST: THE DETECTION OF FIVE HIGHLY EXTINGUISHED LOW- EVENTS

Astronomical Journal - Tập 153 Số 2 - Trang 61 - 2017
Yossi Shvartzvald1, G. Bryden1, Andrew Gould2,3,4, A. Gould1, Steve B. Howell5, Charles Beichman6
1Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
2Department of Astronomy, Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210, USA
3Korea Astronomy and Space Science Institute, Daejon 305-348, Republic of Korea
4Max-Planck-Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
5Kepler & K2 Missions, NASA Ames Research Center, P.O. Box 1, M/S 244-30, Moffett Field, CA 94035, USA
6NASA Exoplanet Science Institute, California Institute of Technology, Pasadena, CA 91125, USA

Tóm tắt

ABSTRACT Optical microlensing surveys are restricted from detecting events near the Galactic plane and center, where the event rate is thought to be the highest due to the high optical extinction of these fields. In the near-infrared (NIR), however, the lower extinction leads to a corresponding increase in event detections and is a primary driver for the wavelength coverage of the WFIRST microlensing survey. During the 2015 and 2016 bulge observing seasons, we conducted NIR microlensing surveys with UKIRT in conjunction with and in support of the Spitzer and Kepler microlensing campaigns. Here, we report on five highly extinguished ( ), low-Galactic latitude ( ) microlensing events discovered from our 2016 survey. Four of them were monitored with an hourly cadence by optical surveys but were not reported as discoveries, likely due to the high extinction. Our UKIRT surveys and suggested future NIR surveys enable the first measurement of the microlensing event rate in the NIR. This wavelength regime overlaps with the bandpass of the filter in which the WFIRST microlensing survey will conduct its highest-cadence observations, making this event rate derivation critically important for optimizing its yield.

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Astronomical Journal

Tập 153 Số 2

61

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