An Isolated Microlens Observed from K2, Spitzer, and Earth

Zhu, Wei and Udalski, A. and Huang, C. X. ORCID: and Calchi Novati, S. and Sumi, T. and Poleski, R. and Skowron, J. and Mroz, P. and Szymanski, M. K. and Soszynski, I. and Pietrukowicz, P. and Kozlowski, S. and Ulaczyk, K. and Pawlak, M. and Beichman, C. and Bryden, G. and Carey, S. and Gaudi, B. S. and Gould, A. and Henderson, C. B. and Shvartzvald, Y. and Yee, J. C. and Bond, I. A. and Bennett, D. P. and Suzuki, D. and Rattenbury, N. J. and Koshimoto, N. and Abe, F. and Asakura, Y. and Barry, R. K. and Bhattacharya, A. and Donachie, M. and Evans, P. and Fukui, A. and Hirao, Y. and Itow, Y. and Kawasaki, K. and Li, M. C. A. and Ling, C. H. and Masuda, K. and Matsubara, Y. and Miyazaki, S. and Munakata, H. and Muraki, Y. and Nagakane, M. and Ohnishi, K. and Ranc, C. and Saito, To. and Sharan, A. and Sullivan, D. J. and Tristram, P. J. and Yamada, T. and Yonehara, A. (2017) An Isolated Microlens Observed from K2, Spitzer, and Earth. The Astrophysical Journal Letters, 849 (2):L31. pp. 1-6. ISSN 2041-8205

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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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 31 Mar 2022 03:19
Last Modified: 17 May 2022 01:20
Uncontrolled Keywords: gravitational lensing: micro; methods: data analysis; parallaxes; stars: fundamental parameters; techniques: photometric; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
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