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

Bachelet, E, Bozza, V, Han, C, Udalski, A, Bond, IA, Beaulieu, J-P, Street, RA, Kim, H-I, 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, Li, MCA, Matsubara, Y, Muraki, Y, Miyazaki, S, Nagakane, M, Rattenbury, NJ, Suematsu, H, Sullivan, DJ, Sumi, T, Suzuki, D, Tristram, PJ and Yonehara, A (2018) First Assessment of the Binary Lens OGLE-2015-BLG-0232. Astrophysical Journal, 870 (1). ISSN 0004-637X

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Open Access URL: https://dx.doi.org/10.3847/1538-4357/aaedb9 (Published version)

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: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
Related URLs:
Date Deposited: 26 Feb 2019 09:20
Last Modified: 26 Feb 2019 09:20
DOI or Identification number: 10.3847/1538-4357/aaedb9
URI: http://researchonline.ljmu.ac.uk/id/eprint/10211

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