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An analysis of binary microlensing event OGLE-2015-BLG-0060We 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.
Document ID
20205003767
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Y. Tsapras (Heidelberg University Tiffin, Ohio, United States)
A. Cassan (Institut d'Astrophysique de Paris Paris, France)
Clement Ranc (Goddard Space Flight Center Greenbelt, Maryland, United States)
E. Bachelet (Las Cumbres Observatory Global Telescope Network Goleta, California, United States)
R. Street (Las Cumbres Observatory Global Telescope Network Goleta, California, United States)
A. Udalski (University of Warsaw Warsaw, Poland)
M. Hundertmark (Heidelberg University Tiffin, Ohio, United States)
V. Bozza (University of Salerno Fisciano, Italy)
J. P. Beaulieu (Institut d'Astrophysique de Paris Paris, France)
J. B Marquette (Institut d'Astrophysique de Paris Paris, France)
E. Euteneuer (Heidelberg University Tiffin, Ohio, United States)
D. M. Bramich (New York University Abu Dhabi Abu Dhabi, United Arab Emirates)
M. Dominik (University of St Andrews St Andrews, Fife, United Kingdom)
R. Figuera Jaimes (University of St Andrews St Andrews, Fife, United Kingdom)
K. Horne (University of St Andrews St Andrews, Fife, United Kingdom)
S. Mao (Tsinghua University Beijing, Beijing, China)
J. Menzies (South African Radio Astronomy Observatory Cape Town, South Africa)
R. Schmidt (Heidelberg University Tiffin, Ohio, United States)
C. Snodgrass (Open University, Milton Keynes)
I. A. Steele (Liverpool John Moores University Liverpool, United Kingdom)
J. Wambsganss (Heidelberg University Tiffin, Ohio, United States)
P. Mr´oz (University of Warsaw Warsaw, Poland)
M. K. Szyma´nski (University of Warsaw Warsaw, Poland)
I. Soszy´nski (University of Warsaw Warsaw, Poland)
J. Skowron (University of Warsaw Warsaw, Poland)
P. Pietrukowicz (University of Warsaw Warsaw, Poland)
S. Kozlowski (University of Warsaw Warsaw, Poland)
R. Poleski (The Ohio State University Columbus, Ohio, United States)
K. Ulaczyk (University of Warsaw Warsaw, Poland)
M. Pawlak (University of Warsaw Warsaw, Poland)
U. G. Jorgensen (University of Copenhagen Copenhagen, Denmark)
J. Skottfelt (University of Copenhagen Copenhagen, Denmark)
A. Popovas (University of Copenhagen Copenhagen, Denmark)
S. Ciceri (Max Planck Institute for Astronomy Heidelberg, Germany)
H. Korhonen (University of Copenhagen Copenhagen, Denmark)
M. Kuffmeier (University of Copenhagen Copenhagen, Denmark)
D.F. Evans (Keele University Newcastle-under-Lyme, United Kingdom)
N. Peixinho (University of Antofagasta Antofagasta, Chile)
T. C. Hinse (Korea Astronomy and Space Science Institute Daejeon, South Korea)
M. J. Burgdorf (Universität Hamburg Hamburg, Germany)
J. Southworth (Keele University Newcastle-under-Lyme, United Kingdom)
R. Tronsgaard (Aarhus University Aarhus, Denmark)
E. Kerins (University of Manchester Manchester, Manchester, United Kingdom)
M. I. Andersen (University of Copenhagen Copenhagen, Denmark)
S. Rahvar (Sharif University of Technology Tehran, Iran)
Y. Wang (Chinese Academy of Sciences Beijing, Beijing, China)
O. Wertz (Institut d’Astrophysique et de G´eophysique)
M. Rabus (Max Planck Institute for Astronomy Heidelberg, Germany)
S. Calchi Novati (Infrared Processing and Analysis Center Pasadena, California, United States)
G. D’Ago (University of Salerno Fisciano, Italy)
G. Scarpetta (University of Salerno Fisciano, Italy)
L. Mancini (Max Planck Institute for Astronomy Heidelberg, Germany)
F. Abe (Nagoya University Nagoya, Japan)
Y. Asakura (Nagoya University Nagoya, Japan)
D P Bennett (University of Maryland, College Park College Park, Maryland, United States)
A Bhattacharya (University of Maryland, College Park College Park, Maryland, United States)
M. Donachie (University of Auckland Auckland, New Zealand)
P. Evans (University of Auckland Auckland, New Zealand)
A. Fukui (National Astronomical Observatory of Japan Mitaka-shi, Japan)
Y. Hirao (Osaka University Osaka, Japan)
Y. Itow (Nagoya University Nagoya, Japan)
K. Kawasaki (Osaka University Osaka, Japan)
N. Koshimoto (Osaka University Osaka, Japan)
M. C. A. Li (University of Auckland Auckland, New Zealand)
C. H. Ling (Massey University Palmerston North, New Zealand)
K. Masuda (Nagoya University Nagoya, Japan)
Y. Matsubara (Nagoya University Nagoya, Japan)
Y. Muraki (Nagoya University Nagoya, Japan)
S. Miyazaki (Osaka University Osaka, Japan)
M. Nagakane (Osaka University Osaka, Japan)
K. Ohnishi (Nagano National College of Technology Nagano, Japan)
N. Rattenbury (University of Auckland Auckland, New Zealand)
To. Saito (Tokyo Metropolitan University Tokyo, Tôkyô, Japan)
A. Sharan (University of Auckland Auckland, New Zealand)
H. Shibai (Osaka University Osaka, Japan)
D. J. Sullivan (Victoria University Kampala, Uganda)
T. Sumi (Osaka University Osaka, Japan)
D Suzuki (Goddard Space Flight Center Greenbelt, Maryland, United States)
P. J. Tristram (University of Canterbury Christchurch, New Zealand)
T. Yamada (Kyoto Sangyo University Kyoto, Kyôto, Japan)
A. Yonehara (University of St Andrews St Andrews, Fife, United Kingdom)
Date Acquired
June 22, 2020
Publication Date
May 30, 2019
Publication Information
Publication: Monthly Notices of the Royal Astronomical Society
Publisher: Royal Astronomical Society and Oxford University Press
Volume: 487
Issue: 4
Issue Publication Date: August 1, 2019
ISSN: 0035-8711
e-ISSN: 1365-2966
DOI: 10.1093/mnras/stz1404
Subject Category
Astronomy
Funding Number(s)
CONTRACT_GRANT: 80GSFC17M0002
CONTRACT_GRANT: NSFC 11333003
CONTRACT_GRANT: NSFC 11390372
CONTRACT_GRANT: STFC ST/M001296/1
CONTRACT_GRANT: MAESTRO 2014/14/A/ST9/00121
CONTRACT_GRANT: NNX15AC97G
Distribution Limits
Public
Copyright
Portions of document may include copyright protected material.
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