First assessment of the binary lens OGLE-2015-BLG-0232
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We present an analysis of the microlensing event OGLE-2015-BLG-0232. This event is challenging to characterize for two reasons. First, the light curve is not well sampled during the caustic crossing due to the proximity of the full Moon impacting the photometry quality. Moreover, the source brightness is difficult to estimate because this event is blended with a nearby K dwarf star. We found that the light curve deviations are likely due to a close brown dwarf companion (i.e., s = 0.55 and q = 0.06), but the exact nature of the lens is still unknown. We finally discuss the potential of follow-up observations to estimate the lens mass and distance in the future.
Bachelet , E , Bozza , V , Han , C , Udalski , A , Bond , I A , Beaulieu , J-P , Street , R A , Kim , J -I , Bramich , D M , Cassan , A , Dominik , M , Figuera Jaimes , R , Horne , K , Hundertmark , M , Mao , S , Menzies , J , Ranc , C , Schmidt , R , Snodgrass , C , Steele , I A , Tsapras , Y , Wambsganss , J , Mróz , P , Soszyński , I , Szymański , M K , Skowron , J , Pietrukowicz , P , Kozłowski , S , Poleski , R , Ulaczyk , K , Pawlak , M , Abe , F , Barry , R , Bennett , D P , Bhattacharya , A , Donachie , M , Fukui , A , Hirao , Y , Itow , Y , Kawasaki , K , Kondo , I , Koshimoto , N , Li , M C A , Matsubara , Y , Muraki , Y , Miyazaki , S , Nagakane , M , Rattenbury , N J , Suematsu , H , Sullivan , D J , Sumi , T , Suzuki , D , Tristram , P J & Yonehara , A 2018 , ' First assessment of the binary lens OGLE-2015-BLG-0232 ' , Astrophysical Journal , vol. 870 , no. 1 , 11 . https://doi.org/10.3847/1538-4357/aaedb9
Copyright © 2018 The American Astronomical Society. All rights reserved. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.3847/1538-4357/aaedb9
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