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

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Tsapras, Y, Cassan, A, Ranc, C, Bachelet, E, Street, R, Udalski, A, Hundertmark, M, Bozza, V, Beaulieu, J-P ORCID: 0000-0003-0014-3354, Marquette, JB, Euteneuer, E, Bramich, DM, Dominik, M, Figuera Jaimes, R, Horne, K, Mao, S, Menzies, J, Schmidt, R, Snodgrass, C, Steele, IA, Wambsganss, J, Mroz, P, Szymanski, MK, Soszynski, I, Skowron, J, Pietrukowicz, P, Kozlowski, S, Poleski, R, Ulaczyk, K, Pawlak, M, Jorgensen, UG, Skottfelt, J, Popovas, A, Ciceri, S, Korhonen, H, Kuffmeier, M, Evans, DF, Peixinho, N, Hinse, TC, Burgdorf, MJ, Southworth, J, Tronsgaard, R, Kerins, E, Andersen, MI, Rahvar, S, Wang, Y, Wertz, O, Rabus, M, Calchi Novati, S, D'ago, G, Scarpetta, G, Mancini, L, Abe, F, Asakura, Y, Bennett, DP, Bhattacharya, A, Donachie, M, Evans, P, Fukui, A, Hirao, Y, Itow, Y, Kawasaki, K, Koshimoto, N, Li, MCA, Ling, CH, Masuda, K, Matsubara, Y, Muraki, Y, Miyazaki, S, Nagakane, M, Ohnishi, K, Rattenbury, N, Saito, T, Sharan, A, Shibai, H, Sullivan, DJ, Sumi, T, Suzuki, D, Tristram, PJ, Yamada, T and Yonehara, A 2019 , 'An analysis of binary microlensing event OGLE-2015-BLG-0060' , Monthly Notices of the Royal Astronomical Society, vol. 487, no. 4 , pp. 4603-4614 , doi: 10.1093/mnras/stz1404.

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Abstract

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±0.12M⊙ and M⋆2=0.77±0.11M⊙⁠. 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 Type: Article
Authors/Creators: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
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Blackwell Publishing Ltd
ISSN: 0035-8711
DOI / ID Number: 10.1093/mnras/stz1404
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Copyright (2019) The Author(s).

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