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

Tsapras, Y; Cassan, A; Ranc, C; Bachelet, E; Street, R; Udalski, A; Hundertmark, M; Bozza, V; Beaulieu, Jean-Philippe; 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; Yonehara, A

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

journal contribution

posted on 2023-05-21, 12:05 authored by Tsapras, Y, Cassan, A, Ranc, C, Bachelet, E, Street, R, Udalski, A, Hundertmark, M, Bozza, V, Jean-Philippe BeaulieuJean-Philippe Beaulieu, 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, Yonehara, A

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.

History

Publication title

Monthly Notices of the Royal Astronomical Society

Volume

487

Issue

4

Pagination

4603-4614

ISSN

0035-8711

Department/School

School of Natural Sciences

Publisher

Blackwell Publishing Ltd

Place of publication

9600 Garsington Rd, Oxford, England, Oxon, Ox4 2Dg

Rights statement

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.