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First assessment of the binary lens OGLE-2015-BLG-0232


Bachelet, E and Bozza, V and Han, C and Udalski, A and Bond, IA and Beaulieu, JP and Street, RA and Kim, HI and Bramich, DM and Cassan, A and Dominik, M and Jaimes, RF and Horne, K and Hundertmark, M and Mao, S and Menzies, J and Ranc, C and Schmidt, R and Snodgrass, C and Steele, IA and Tsapras, Y and Wambsganss, J and Mroz, P and Soszynski, I and Szymanski, MK and Skowron, J and Pietrukowicz, P and Kozlowski, S and Poleski, R and Ulaczyk, K and Pawlak, M and Abe, F and Barry, R and Bennett, DP and Bhattacharya, A and Donachie, M and Fukui, A and Hirao, Y and Itow, Y and Kawasaki, K and Kondo, I and Koshimoto, N and Cheung Alex Li, M and Matsubara, Y and Muraki, Y and Miyazaki, S and Nagakane, M and Rattenbury, NJ and Suematsu, H and Sullivan, DJ and Sumi, T and Suzuki, D and Tristram, PJ and Yonehara, A, RoboNet Collaboration, OGLE Collaboration, MOA Collaboration, First assessment of the binary lens OGLE-2015-BLG-0232, Astrophysical Journal, 870, (11) pp. 1-10. ISSN 0004-637X (2019) [Refereed Article]

Copyright Statement

2018. The American Astronomical Society.

DOI: doi:10.3847/1538-4357/aaedb9


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 Details

Item Type:Refereed Article
Keywords:binaries, general, gravitational lensing, micro
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Beaulieu, JP (Dr Jean-Philippe Beaulieu)
ID Code:152790
Year Published:2019
Web of Science® Times Cited:1
Deposited By:Physics
Deposited On:2022-08-24
Last Modified:2022-09-19

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