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An analysis of binary microlensing event OGLE-2015-BLG-0060


Tsapras, Y and Cassan, A and Ranc, C and Bachelet, E and Street, R and Udalski, A and Hundertmark, M and Bozza, V and Beaulieu, J-P and Marquette, JB and Euteneuer, E and Bramich, DM and Dominik, M and Figuera Jaimes, R and Horne, K and Mao, S and Menzies, J and Schmidt, R and Snodgrass, C and Steele, IA and Wambsganss, J and Mroz, P and Szymanski, MK and Soszynski, I and Skowron, J and Pietrukowicz, P and Kozlowski, S and Poleski, R and Ulaczyk, K and Pawlak, M and Jorgensen, UG and Skottfelt, J and Popovas, A and Ciceri, S and Korhonen, H and Kuffmeier, M and Evans, DF and Peixinho, N and Hinse, TC and Burgdorf, MJ and Southworth, J and Tronsgaard, R and Kerins, E and Andersen, MI and Rahvar, S and Wang, Y and Wertz, O and Rabus, M and Calchi Novati, S and D'ago, G and Scarpetta, G and Mancini, L and Abe, F and Asakura, Y and Bennett, DP and Bhattacharya, A and Donachie, M and Evans, P and Fukui, A and Hirao, Y and Itow, Y and Kawasaki, K and Koshimoto, N and Li, MCA and Ling, CH and Masuda, K and Matsubara, Y and Muraki, Y and Miyazaki, S and Nagakane, M and Ohnishi, K and Rattenbury, N and Saito, T and Sharan, A and Shibai, H and Sullivan, DJ and Sumi, T and Suzuki, D and Tristram, PJ and Yamada, T and Yonehara, A and The OGLE collaboration, The MiNDSTEp collaboration, The MOA collaboration, An analysis of binary microlensing event OGLE-2015-BLG-0060, Monthly Notices of the Royal Astronomical Society, 487, (4) pp. 4603-4614. ISSN 0035-8711 (2019) [Refereed Article]

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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society : 2019 the author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

DOI: doi:10.1093/mnras/stz1404


We present the analysis of stellar binary microlensing event OGLE-2015-BLG-0060 based on observations obtained from 13 different telescopes. Intensive coverage of the anomalous parts of the light curve was achieved by automated follow-up observations from the robotic telescopes of the Las Cumbres Observatory. We show that, for the first time, all main features of an anomalous microlensing event are well covered by follow-up data, allowing us to estimate the physical parameters of the lens. The strong detection of second-order effects in the event light curve necessitates the inclusion of longer-baseline survey data in order to constrain the parallax vector. We find that the event was most likely caused by a stellar binary-lens with masses M*1=0.87+-0.12MO and M*2=0.77+-0.11MO⁠. The distance to the lensing system is 6.41 +- 0.14 kpc and the projected separation between the two components is 13.85 +- 0.16 au. Alternative interpretations are also considered.

Item Details

Item Type:Refereed Article
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, J-P (Dr Jean-Philippe Beaulieu)
ID Code:152431
Year Published:2019
Web of Science® Times Cited:1
Deposited By:Research Performance and Analysis
Deposited On:2022-08-18
Last Modified:2022-09-15
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