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The first planetary microlensing event with two microlensed source stars

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posted on 2023-05-19, 23:55 authored by Bennett, DP, Udalski, A, Han, C, Bond, IA, Jean-Philippe BeaulieuJean-Philippe Beaulieu, Skowron, J, Gaudi, BS, Koshimoto, N, Abe, F, Asakura, Y, Barry, RK, Bhattacharya, A, Donachie, M, Evans, P, Fukui, A, Hirao, Y, Itow, Y, Li, MCA, Ling, CH, Masuda, K, Matsubara, Y, Muraki, Y, Nagakane, M, Ohnishi, K, Oyokawa, H, Ranc, C, Rattenbury, NJ, Rosenthal, MM, Saito, T, Sharan, A, Sullivan, DJ, Sumi, T, Suzuki, D, Tristram, PJ, Yonehara, A, Szymanski, MK, Poleski, R, Soszynski, I, Ulaczyk, K, Wyrzykowski, K, Depoy, D, Gould, A, Pogge, RW, Yee, JC, Albrow, MD, Bachelet, E, Batista, V, Bowens-Rubin, R, Brillant, S, Caldwell, JAR, Andrew ColeAndrew Cole, Coutures, C, Dieters, S, Prester, DD, Donatowicz, J, Fouque, P, Horne, K, Hundertmark, M, Kains, N, Kane, SR, Marquette, JB, Menzies, J, Pollard, KR, Sahu, KC, Wambsganss, J, Williams, A, Zub, M

We present the analysis of the microlensing event MOA-2010-BLG-117, and show that the light curve can only be explained by the gravitational lensing of a binary source star system by a star with a Jupiter-mass ratio planet. It was necessary to modify standard microlensing modeling methods to find the correct light curve solution for this binary source, binary-lens event. We are able to measure a strong microlensing parallax signal, which yields the masses of the host star, M* = 0.58 ± 0.11 M, and planet, mp = 0.54 ± 0.10MJup, at a projected star–planet separation of a = 2.42 ± 0.26 au, corresponding to a semimajor axis of a = 2.9+1.6-0.6 au. Thus, the system resembles a half-scale model of the Sun–Jupiter system with a half-Jupiter0mass planet orbiting a half-solar-mass star at very roughly half of Jupiter's orbital distance from the Sun. The source stars are slightly evolved, and by requiring them to lie on the same isochrone, we can constrain the source to lie in the near side of the bulge at a distance of DS = 6.9 ± 0.7 kpc, which implies a distance to the planetary lens system of DL = 3.5 ± 0.4 kpc. The ability to model unusual planetary microlensing events, like this one, will be necessary to extract precise statistical information from the planned large exoplanet microlensing surveys, such as the WFIRST microlensing survey.

History

Publication title

Astronomical Journal

Volume

155

Article number

141

Number

141

Pagination

1-15

ISSN

0004-6256

Department/School

School of Natural Sciences

Publisher

Univ Chicago Press

Place of publication

1427 E 60Th St, Chicago, USA, Il, 60637-2954

Rights statement

© 2018. The American Astronomical Society. All rights reserved.

Repository Status

  • Open

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Expanding knowledge in the physical sciences

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