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An Isolated Microlens Observed from K2, Spitzer, and Earth

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posted on 2018-05-15, 14:28 authored by W. Zhu, A. Udalski, C. X. Huang, S. C. Novati, T. Sumi, R. Poleski, J. Skowron, P. Mróz, M. K. Szymański, I. Soszyński, P. Pietrukowicz, S. Kozłowski, K. Ulaczyk, M. Pawlak, C. Beichman, G. Bryden, S. Carey, B. S. Gaudi, A. Gould, C. B. Henderson, Y. Shvartzvald, J.C . Yee, I. A. Bond, D. P. Bennett, D. Suzuki, N. J. Rattenbury, N. Koshimoto, F. Abe, Y. Asakura, R. K. Barry, A. Bhattacharya, M. Donachie, Philip Evans, A. Fukui, Y. Hirao, Y. Itow, K Kawasaki, M. C. A. Li, C. H. Ling, K. Masuda, Y. Matsubara, S. Miyazaki, H. Munakata, Y. Muraki, M. Nagakane, K. Ohnishi, C. Ranc, T. Saito, A. Sharan, D. J. Sullivan, P. J. Tristram, T. Yamada, A. Yonehara
We present the result of microlensing event MOA-2016-BLG-290, which received observations from the two-wheel Kepler (K2), Spitzer, as well as ground-based observatories. A joint analysis of data from K2 and the ground leads to two degenerate solutions of the lens mass and distance. This degeneracy is effectively broken once the (partial) Spitzer light curve is included. Altogether, the lens is found to be an extremely low-mass star or brown dwarf () located in the Galactic bulge ( kpc). MOA-2016-BLG-290 is the first microlensing event for which we have signals from three well-separated (∼1 au) locations. It demonstrates the power of two-satellite microlensing experiment in reducing the ambiguity of lens properties, as pointed out independently by S. Refsdal and A. Gould several decades ago.

History

Citation

Astrophysical Journal Letters, 2017, 849 (2)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Astrophysical Journal Letters

Publisher

American Astronomical Society

issn

2041-8205

eissn

2041-8213

Copyright date

2017

Available date

2018-05-15

Publisher version

http://iopscience.iop.org/article/10.3847/2041-8213/aa93fa/meta

Language

en

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