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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, J P; Marquette, J B; Euteneuer, E; Bramich, D M; Dominik, M; Figuera Jaimes, R; Horne, K; Mao, S; Menzies, J; Schmidt, R; Snodgrass, C; Steele, I A; Wambsganss, J; Mróz, P; Szymański, M K; Soszyński, I; Skowron, J; Pietrukowicz, P; Kozłowski, S; Poleski, R; Ulaczyk, K; Pawlak, M; Jørgensen, U G; Skottfelt, J; Popovas, A; Ciceri, S; Korhonen, H; Kuffmeier, M; Evans, D F; Peixinho, N; Hinse, T C; Burgdorf, M J; Southworth, J; Tronsgaard, R; Kerins, E; Andersen, M I; Rahvar, S; Wang, Y; Wertz, O; Rabus, M; Calchi Novati, S; D’Ago, G; Scarpetta, G; Mancini, L; Abe, F; Asakura, Y; Bennett, D P; Bhattacharya, A; Donachie, M; Evans, P; Fukui, A; Hirao, Y; Itow, Y; Kawasaki, K; Koshimoto, N; Li, M C A; Ling, C H; Masuda, K; Matsubara, Y; Muraki, Y; Miyazaki, S; Nagakane, M; Ohnishi, K; Rattenbury, N; Saito, To; Sharan, A; Shibai, H; Sullivan, D J; Sumi, T; Suzuki, D; Tristram, P J; Yamada, T...

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Y Tsapras

A Cassan

C Ranc

E Bachelet

R Street

A Udalski

M Hundertmark

V Bozza

J P Beaulieu

J B Marquette

E Euteneuer

D M Bramich

M Dominik

R Figuera Jaimes

K Horne

S Mao

J Menzies

R Schmidt

C Snodgrass

I A Steele

J Wambsganss

P Mróz

M K Szymański

I Soszyński

J Skowron

P Pietrukowicz

S Kozłowski

R Poleski

K Ulaczyk

M Pawlak

U G Jørgensen

J Skottfelt

A Popovas

S Ciceri

H Korhonen

M Kuffmeier

D F Evans

N Peixinho

T C Hinse

M J Burgdorf

R Tronsgaard

E Kerins

M I Andersen

S Rahvar

Y Wang

O Wertz

M Rabus

S Calchi Novati

G D’Ago

G Scarpetta

L Mancini

F Abe

Y Asakura

D P Bennett

A Bhattacharya

M Donachie

P Evans

A Fukui

Y Hirao

Y Itow

K Kawasaki

N Koshimoto

M C A Li

C H Ling

K Masuda

Y Matsubara

Y Muraki

S Miyazaki

M Nagakane

K Ohnishi

N Rattenbury

To Saito

A Sharan

H Shibai

D J Sullivan

T Sumi

D Suzuki

P J Tristram

T Yamada

A Yonehara

The RoboNet team

The OGLE collaboration

The MiNDSTEp collaboration

The MOA collaboration


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_\star 1 = 0.87 \pm 0.12 \, \mathrmM_ødot $ and $M_\star 2 = 0.77 \pm 0.11 \, \mathrmM_ødot $. 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.


Tsapras, Y., Cassan, A., Ranc, C., Bachelet, E., Street, R., Udalski, A., …collaboration, T. M. (2019). An analysis of binary microlensing event OGLE-2015-BLG-0060. Monthly Notices of the Royal Astronomical Society, 487(4), 4603 - 4614.

Journal Article Type Article
Acceptance Date May 16, 2019
Online Publication Date May 30, 2019
Publication Date Aug 1, 2019
Publicly Available Date May 26, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 487
Issue 4
Pages 4603 - 4614
Keywords gravitational lensing, micro, methods, observational, techniques, photometric, Galaxy, bulge
Publisher URL


southworth-2019-analysis-binary-microlensing-event-ogle-mnras-vor.pdf (43.8 Mb)

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