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First assessment of the binary lens OGLE-2015-BLG-0232
journal contribution
posted on 2023-05-21, 12:50 authored by Bachelet, E, Bozza, V, Han, C, Udalski, A, Bond, IA, Jean-Philippe BeaulieuJean-Philippe Beaulieu, Street, RA, Kim, HI, Bramich, DM, Cassan, A, Dominik, M, Jaimes, RF, Horne, K, Hundertmark, M, Mao, S, Menzies, J, Ranc, C, Schmidt, R, Snodgrass, C, Steele, IA, Tsapras, Y, Wambsganss, J, Mroz, P, Soszynski, I, Szymanski, MK, Skowron, J, Pietrukowicz, P, Kozlowski, S, Poleski, R, Ulaczyk, K, Pawlak, M, Abe, F, Barry, R, Bennett, DP, Bhattacharya, A, Donachie, M, Fukui, A, Hirao, Y, Itow, Y, Kawasaki, K, Kondo, I, Koshimoto, N, Cheung Alex Li, M, Matsubara, Y, Muraki, Y, Miyazaki, S, Nagakane, M, Rattenbury, NJ, Suematsu, H, Sullivan, DJ, Sumi, T, Suzuki, D, Tristram, PJ, Yonehara, AWe 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.
History
Publication title
Astrophysical JournalVolume
870Issue
11Pagination
1-10ISSN
0004-637XDepartment/School
School of Natural SciencesPublisher
Institute of Physics Publishing, IncPlace of publication
United StatesRights statement
© 2018. The American Astronomical Society.Repository Status
- Restricted
