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

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; J. Southworth; 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

doi:10.1093/mnras/stz1404

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

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. SteeleJ. 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, J. Southworth, 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

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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.

Original language	English
Pages (from-to)	4603–4614
Journal	Monthly Notices of the Royal Astronomical Society
Volume	487
Issue number	4
Early online date	30 May 2019
DOIs	https://doi.org/10.1093/mnras/stz1404
Publication status	Published - Aug 2019

Keywords

Gravitational lensing: micro
Methods: observational
Techniques: photometric
Galaxy: bulge

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10.1093/mnras/stz1404

stz1404
Copyright 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with the publisher's policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stz1404
Final published version, 41.8 MB

http://adsabs.harvard.edu/abs/2019MNRAS.tmp.1368T

Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018
Jardine, M. (PI), Cameron, A. (CoI), Cyganowski, C. (CoI), Horne, K. (CoI) & Wood, K. (CoI)
Science & Technology Facilities Council
1/04/15 → 31/03/18
Project: Standard

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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., ... Yonehara, A. (2019). An analysis of binary microlensing event OGLE-2015-BLG-0060. Monthly Notices of the Royal Astronomical Society, 487(4), 4603–4614. https://doi.org/10.1093/mnras/stz1404

@article{299e280ef48748dfab105485e9ee207a,

title = "An analysis of binary microlensing event OGLE-2015-BLG-0060",

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.",

keywords = "Gravitational lensing: micro, Methods: observational, Techniques: photometric, Galaxy: bulge",

author = "Y. Tsapras and A. Cassan and C. Ranc and E. Bachelet and R. Street and A. Udalski and M. Hundertmark and V. Bozza and Beaulieu, {J. P.} and Marquette, {J. B.} and E. Euteneuer and Bramich, {D. M.} and M. Dominik and {Figuera Jaimes}, R. and K. Horne and S. Mao and J. Menzies and R. Schmidt and C. Snodgrass and Steele, {I. A.} and J. Wambsganss and P. Mr{\'o}z and Szyma{\'n}ski, {M. K.} and I. Soszy{\'n}ski and J. Skowron and P. Pietrukowicz and S. Koz{\l}owski and R. Poleski and K. Ulaczyk and M. Pawlak and J{\o}rgensen, {U. G.} and J. Skottfelt and A. Popovas and S. Ciceri and H. Korhonen and M. Kuffmeier and Evans, {D. F.} and N. Peixinho and Hinse, {T. C.} and Burgdorf, {M. J.} and J. Southworth and R. Tronsgaard and E. Kerins and Andersen, {M. I.} and S. Rahvar and Y. Wang and O. Wertz and M. Rabus and {Calchi Novati}, S. and G. D'Ago and G. Scarpetta and L. Mancini and F. Abe and Y. Asakura and Bennett, {D. P.} and A. Bhattacharya and M. Donachie and P. Evans and A. Fukui and Y. Hirao and Y. Itow and K. Kawasaki and N. Koshimoto and Li, {M. C. A.} and Ling, {C. H.} and K. Masuda and Y. Matsubara and Y. Muraki and S. Miyazaki and M. Nagakane and K. Ohnishi and N. Rattenbury and To. Saito and A. Sharan and H. Shibai and Sullivan, {D. J.} and T. Sumi and D. Suzuki and Tristram, {P. J.} and T. Yamada and A. Yonehara",

note = "Funding: UK STFC grant ST/M001296/1 (KH).",

year = "2019",

month = aug,

doi = "10.1093/mnras/stz1404",

language = "English",

volume = "487",

pages = "4603–4614",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "4",

}

Tsapras, Y, Cassan, A, Ranc, C, Bachelet, E, Street, R, Udalski, A, Hundertmark, M, Bozza, V, Beaulieu, JP, 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, Mróz, P, Szymański, MK, Soszyński, I, Skowron, J, Pietrukowicz, P, Kozłowski, S, Poleski, R, Ulaczyk, K, Pawlak, M, Jørgensen, 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 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. https://doi.org/10.1093/mnras/stz1404

TY - JOUR

T1 - An analysis of binary microlensing event OGLE-2015-BLG-0060

AU - Tsapras, Y.

AU - Cassan, A.

AU - Ranc, C.

AU - Bachelet, E.

AU - Street, R.

AU - Udalski, A.

AU - Hundertmark, M.

AU - Bozza, V.

AU - Beaulieu, J. P.

AU - Marquette, J. B.

AU - Euteneuer, E.

AU - Bramich, D. M.

AU - Dominik, M.

AU - Figuera Jaimes, R.

AU - Horne, K.

AU - Mao, S.

AU - Menzies, J.

AU - Schmidt, R.

AU - Snodgrass, C.

AU - Steele, I. A.

AU - Wambsganss, J.

AU - Mróz, P.

AU - Szymański, M. K.

AU - Soszyński, I.

AU - Skowron, J.

AU - Pietrukowicz, P.

AU - Kozłowski, S.

AU - Poleski, R.

AU - Ulaczyk, K.

AU - Pawlak, M.

AU - Jørgensen, U. G.

AU - Skottfelt, J.

AU - Popovas, A.

AU - Ciceri, S.

AU - Korhonen, H.

AU - Kuffmeier, M.

AU - Evans, D. F.

AU - Peixinho, N.

AU - Hinse, T. C.

AU - Burgdorf, M. J.

AU - Southworth, J.

AU - Tronsgaard, R.

AU - Kerins, E.

AU - Andersen, M. I.

AU - Rahvar, S.

AU - Wang, Y.

AU - Wertz, O.

AU - Rabus, M.

AU - Calchi Novati, S.

AU - D'Ago, G.

AU - Scarpetta, G.

AU - Mancini, L.

AU - Abe, F.

AU - Asakura, Y.

AU - Bennett, D. P.

AU - Bhattacharya, A.

AU - Donachie, M.

AU - Evans, P.

AU - Fukui, A.

AU - Hirao, Y.

AU - Itow, Y.

AU - Kawasaki, K.

AU - Koshimoto, N.

AU - Li, M. C. A.

AU - Ling, C. H.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Muraki, Y.

AU - Miyazaki, S.

AU - Nagakane, M.

AU - Ohnishi, K.

AU - Rattenbury, N.

AU - Saito, To.

AU - Sharan, A.

AU - Shibai, H.

AU - Sullivan, D. J.

AU - Sumi, T.

AU - Suzuki, D.

AU - Tristram, P. J.

AU - Yamada, T.

AU - Yonehara, A.

N1 - Funding: UK STFC grant ST/M001296/1 (KH).

PY - 2019/8

Y1 - 2019/8

N2 - 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.

AB - 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.

KW - Gravitational lensing: micro

KW - Methods: observational

KW - Techniques: photometric

KW - Galaxy: bulge

U2 - 10.1093/mnras/stz1404

DO - 10.1093/mnras/stz1404

M3 - Article

SN - 0035-8711

VL - 487

SP - 4603

EP - 4614

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

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

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Keywords

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Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018

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