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    OGLE-2015-BLG-1459L: The Challenges of Exo-Moon Microlensing (2017)

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    1711.09651v1.pdf (2.190Mb)
    Type of Content
    Journal Article
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    http://hdl.handle.net/10092/15194
    
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    • Science: Journal Articles [1192]
    Authors
    Hwang K-H
    Udalski A
    Bond IA
    Albrow MD
    Chung S-J
    Gould A
    Han C
    Jung YK
    Ryu Y-H
    Shin I-G
    Yee JC
    Zhu W
    Cha S-M
    Kim D-J
    Kim H-W
    Kim S-L
    Lee C-U
    Lee D-J
    Lee Y
    Park B-G
    Pogge RW
    Pawlak M
    Poleski R
    Szymański MK
    Skowron J
    Soszyński I
    Mróz P
    Kozłowski S
    Pietrukowicz P
    Ulaczyk K
    Abe F
    Asakura Y
    Barry R
    Bennett DP
    Bhattacharya A
    Donachie M
    Evans P
    Fukui A
    Hirao Y
    Itow Y
    Kawasaki K
    Koshimoto N
    Li MCA
    Ling CH
    Masuda K
    Matsubara Y
    Miyazaki S
    Muraki Y
    Nagakane M
    Ohnishi K
    Ranc C
    Rattenbury NJ
    Saito T
    Sharan A
    Sullivan DJ
    Sumi T
    Suzuki D
    Tristram PJ
    Yamada T
    Yamada T
    Yonehara A
    show all
    Abstract

    We show that dense OGLE and KMTNet $I$-band survey data require four bodies (sources plus lenses) to explain the microlensing light curve of OGLE-2015-BLG-1459. However, these can equally well consist of three lenses and one source (3L1S), two lenses and two sources (2L2S) or one lens and three sources (1L3S). In the 3L1S and 2L2S interpretations, the host is a brown dwarf and the dominant companion is a Neptune-class planet, with the third body (in the 3L1S case) being a Mars-class object that could have been a moon of the planet. In the 1L3S solution, the light curve anomalies are explained by a tight (five stellar radii) low-luminosity binary source that is offset from the principal source of the event by $\sim 0.17\,{\rm AU}$. These degeneracies are resolved in favor of the 1L3S solution by color effects derived from comparison to MOA data, which are taken in a slightly different ($R/I$) passband. We discuss implications for the observing strategies of current and future ($WFIRST$) observations that would enable them to distinguish among such exotic systems.

    Keywords
    astro-ph.EP; gravitational lensing: micro; planetary systems
    ANZSRC Fields of Research
    51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systems
    02 - Physical Sciences::0201 - Astronomical and Space Sciences::020108 - Planetary Science (excl. Extraterrestrial Geology)

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