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First Assessment of the Binary Lens OGLE-2015-BLG-0232

Bachelet, E.; Bozza, V.; Han, C.; Udalski, A.; Bond, I. A.; Beaulieu, J.-P.; Street, R. A.; Kim, H.-I; Bramich, D. M.; Cassan, A.; Dominik, M.; Jaimes, R. Figuera; 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.; Cheung Alex Li, M.; Matsubara, Y.; Muraki, Y.; Miyazaki, S.; Nagakane, M.; Rattenbury, N. J.; Suematsu, H.; Sullivan, D. J.; Sumi, T.; Suzuki, D.; Tristram, P. J. and Yonehara, A. (2018). First Assessment of the Binary Lens OGLE-2015-BLG-0232. The Astrophysical Journal, 870(1), article no. 11.

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DOI (Digital Object Identifier) Link: https://doi.org/10.3847/1538-4357/aaedb9
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Abstract

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.

Item Type: Journal Item
ISSN: 1538-4357
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 58661
Depositing User: ORO Import
Date Deposited: 15 Jan 2019 08:49
Last Modified: 02 May 2019 21:34
URI: http://oro.open.ac.uk/id/eprint/58661
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