OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing

Shun-Sheng Li; Weicheng Zang; Andrzej Udalski; Yossi Shvartzvald; Daniel Huber; Chung-Uk Lee; Takahiro Sumi; Andrew Gould; Shude Mao; Pascal Fouqué; Tianshu Wang; Subo Dong; Uffe G. Jørgensen; Andrew Cole; Przemek Mróz; Michał K. Szymański; Jan Skowron; Radosław Poleski; Igor Soszyński; Paweł Pietrukowicz; Szymon Kozłowski; Krzysztof Ulaczyk; Krzysztof A. Rybicki; Patryk Iwanek; Jennifer C. Yee; Sebastiano Calchi Novati; Charles A. Beichman; Geoffery Bryden; Sean Carey; B. Scott Gaudi; Calen B. Henderson; Wei Zhu; Michael D. Albrow; Sun-Ju Chung; Cheongho Han; Kyu-Ha Hwang; Youn Kil Jung; Yoon-Hyun Ryu; In-Gu Shin; Sang-Mok Cha; Dong-Jin Kim; Hyoun-Woo Kim; Seung-Lee Kim; Dong-Joo Lee; Yongseok Lee; Byeong-Gon Park; Richard W. Pogge; Ian A. Bond; Fumio Abe; Richard Barry; David P. Bennett; Aparna Bhattacharya; Martin Donachie; Akihiko Fukui; Yuki Hirao; Yoshitaka Itow; Iona Kondo; Naoki Koshimoto; Man Cheung Alex Li; Yutaka Matsubara; Yasushi Muraki; Shota Miyazaki; Masayuki Nagakane; Clément Ranc; Nicholas J. Rattenbury; Haruno Suematsu; Denis J. Sullivan; Daisuke Suzuki; Paul J. Tristram; Atsunori Yonehara; Grant Christie; John Drummond; Jonathan Green; Steve Hennerley; Tim Natusch; Ian Porritt; Etienne Bachelet; Dan Maoz; Rachel A. Street; Yiannis Tsapras; Valerio Bozza; Martin Dominik; Markus Hundertmark; Nuno Peixinho; Sedighe Sajadian; Martin J. Burgdorf; Daniel F. Evans; Roberto Figuera Jaimes; Yuri I. Fujii; Lauri K. Haikala; Christiane Helling; Thomas Henning; Tobias C. Hinse; Luigi Mancini; Penelope Longa-Peña; Sohrab Rahvar; Markus Rabus; Jesper Skottfelt; Colin Snodgrass; John Southworth; Eduardo Unda-Sanzana; Carolina von Essen; Jean-Phillipe Beaulieu; Joshua Blackman; Kym Hill

doi:10.1093/mnras/stz1873

OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing

Shun-Sheng Li, Weicheng Zang, Andrzej Udalski, Yossi Shvartzvald, Daniel Huber, Chung-Uk Lee, Takahiro Sumi, Andrew Gould, Shude Mao, Pascal Fouqué, Tianshu Wang, Subo Dong, Uffe G. Jørgensen, Andrew Cole, Przemek Mróz, Michał K. Szymański, Jan Skowron, Radosław Poleski, Igor Soszyński, Paweł PietrukowiczSzymon Kozłowski, Krzysztof Ulaczyk, Krzysztof A. Rybicki, Patryk Iwanek, Jennifer C. Yee, Sebastiano Calchi Novati, Charles A. Beichman, Geoffery Bryden, Sean Carey, B. Scott Gaudi, Calen B. Henderson, Wei Zhu, Michael D. Albrow, Sun-Ju Chung, Cheongho Han, Kyu-Ha Hwang, Youn Kil Jung, Yoon-Hyun Ryu, In-Gu Shin, Sang-Mok Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Ian A. Bond, Fumio Abe, Richard Barry, David P. Bennett, Aparna Bhattacharya, Martin Donachie, Akihiko Fukui, Yuki Hirao, Yoshitaka Itow, Iona Kondo, Naoki Koshimoto, Man Cheung Alex Li, Yutaka Matsubara, Yasushi Muraki, Shota Miyazaki, Masayuki Nagakane, Clément Ranc, Nicholas J. Rattenbury, Haruno Suematsu, Denis J. Sullivan, Daisuke Suzuki, Paul J. Tristram, Atsunori Yonehara, Grant Christie, John Drummond, Jonathan Green, Steve Hennerley, Tim Natusch, Ian Porritt, Etienne Bachelet, Dan Maoz, Rachel A. Street, Yiannis Tsapras, Valerio Bozza, Martin Dominik, Markus Hundertmark, Nuno Peixinho, Sedighe Sajadian, Martin J. Burgdorf, Daniel F. Evans, Roberto Figuera Jaimes, Yuri I. Fujii, Lauri K. Haikala, Christiane Helling, Thomas Henning, Tobias C. Hinse, Luigi Mancini, Penelope Longa-Peña, Sohrab Rahvar, Markus Rabus, Jesper Skottfelt, Colin Snodgrass, John Southworth, Eduardo Unda-Sanzana, Carolina von Essen, Jean-Phillipe Beaulieu, Joshua Blackman, Kym Hill

Research output: Contribution to journal › Article › peer-review

Abstract

We present the analysis of the event OGLE-2017-BLG-1186 from the 2017 Spitzer microlensing campaign. This is a remarkable microlensing event because its source is photometrically bright and variable, which makes it possible to perform an asteroseismic analysis using ground-based data. We find that the source star is an oscillating red giant with average time-scale of ∼9 d. The asteroseismic analysis also provides us source properties including the source angular size (∼27 μas) and distance (∼11.5 kpc), which are essential for inferring the properties of the lens. When fitting the light curve, we test the feasibility of Gaussian processes (GPs) in handling the correlated noise caused by the variable source. We find that the parameters from the GP model are generally more loosely constrained than those from the traditional χ² minimization method. We note that this event is the first microlensing system for which asteroseismology and GPs have been used to account for the variable source. With both finite-source effect and microlens parallax measured, we find that the lens is likely a ∼0.045 M_⊙ brown dwarf at distance ∼9.0 kpc, or a ∼0.073 M_⊙ ultracool dwarf at distance ∼9.8 kpc. Combining the estimated lens properties with a Bayesian analysis using a Galactic model, we find a ∼35 per cent probability for the lens to be a bulge object and ∼65 per cent to be a background disc object.

Original language	English
Pages (from-to)	3308-3323
Journal	Monthly Notices of the Royal Astronomical Society
Volume	488
Issue number	3
Early online date	10 Jul 2019
DOIs	https://doi.org/10.1093/mnras/stz1873
Publication status	Published - Sept 2019

Keywords

Asteroseismology
Gravitational lensing: micro
Stars: fundamental parameters
Stars: oscillations

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10.1093/mnras/stz1873

Li_2019_MNRAS_OGLE-2017-BLG-1186_AAM
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 publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/stz1873
Accepted author manuscript, 2.48 MB

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Li, S.-S., Zang, W., Udalski, A., Shvartzvald, Y., Huber, D., Lee, C.-U., Sumi, T., Gould, A., Mao, S., Fouqué, P., Wang, T., Dong, S., Jørgensen, U. G., Cole, A., Mróz, P., Szymański, M. K., Skowron, J., Poleski, R., Soszyński, I., ... Hill, K. (2019). OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing. Monthly Notices of the Royal Astronomical Society, 488(3), 3308-3323. https://doi.org/10.1093/mnras/stz1873

@article{e9124237f1fb4b8fa206e134cc4f2413,

title = "OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing",

abstract = "We present the analysis of the event OGLE-2017-BLG-1186 from the 2017 Spitzer microlensing campaign. This is a remarkable microlensing event because its source is photometrically bright and variable, which makes it possible to perform an asteroseismic analysis using ground-based data. We find that the source star is an oscillating red giant with average time-scale of ∼9 d. The asteroseismic analysis also provides us source properties including the source angular size (∼27 μas) and distance (∼11.5 kpc), which are essential for inferring the properties of the lens. When fitting the light curve, we test the feasibility of Gaussian processes (GPs) in handling the correlated noise caused by the variable source. We find that the parameters from the GP model are generally more loosely constrained than those from the traditional χ2 minimization method. We note that this event is the first microlensing system for which asteroseismology and GPs have been used to account for the variable source. With both finite-source effect and microlens parallax measured, we find that the lens is likely a ∼0.045 M⊙ brown dwarf at distance ∼9.0 kpc, or a ∼0.073 M⊙ ultracool dwarf at distance ∼9.8 kpc. Combining the estimated lens properties with a Bayesian analysis using a Galactic model, we find a ∼35 per cent probability for the lens to be a bulge object and ∼65 per cent to be a background disc object.",

keywords = "Asteroseismology, Gravitational lensing: micro, Stars: fundamental parameters, Stars: oscillations",

author = "Shun-Sheng Li and Weicheng Zang and Andrzej Udalski and Yossi Shvartzvald and Daniel Huber and Chung-Uk Lee and Takahiro Sumi and Andrew Gould and Shude Mao and Pascal Fouqu{\'e} and Tianshu Wang and Subo Dong and J{\o}rgensen, {Uffe G.} and Andrew Cole and Przemek Mr{\'o}z and Szyma{\'n}ski, {Micha{\l} K.} and Jan Skowron and Rados{\l}aw Poleski and Igor Soszy{\'n}ski and Pawe{\l} Pietrukowicz and Szymon Koz{\l}owski and Krzysztof Ulaczyk and Rybicki, {Krzysztof A.} and Patryk Iwanek and Yee, {Jennifer C.} and {Calchi Novati}, Sebastiano and Beichman, {Charles A.} and Geoffery Bryden and Sean Carey and Gaudi, {B. Scott} and Henderson, {Calen B.} and Wei Zhu and Albrow, {Michael D.} and Sun-Ju Chung and Cheongho Han and Kyu-Ha Hwang and Jung, {Youn Kil} and Yoon-Hyun Ryu and In-Gu Shin and Sang-Mok Cha and Dong-Jin Kim and Hyoun-Woo Kim and Seung-Lee Kim and Dong-Joo Lee and Yongseok Lee and Byeong-Gon Park and Pogge, {Richard W.} and Bond, {Ian A.} and Fumio Abe and Richard Barry and Bennett, {David P.} and Aparna Bhattacharya and Martin Donachie and Akihiko Fukui and Yuki Hirao and Yoshitaka Itow and Iona Kondo and Naoki Koshimoto and Li, {Man Cheung Alex} and Yutaka Matsubara and Yasushi Muraki and Shota Miyazaki and Masayuki Nagakane and Cl{\'e}ment Ranc and Rattenbury, {Nicholas J.} and Haruno Suematsu and Sullivan, {Denis J.} and Daisuke Suzuki and Tristram, {Paul J.} and Atsunori Yonehara and Grant Christie and John Drummond and Jonathan Green and Steve Hennerley and Tim Natusch and Ian Porritt and Etienne Bachelet and Dan Maoz and Street, {Rachel A.} and Yiannis Tsapras and Valerio Bozza and Martin Dominik and Markus Hundertmark and Nuno Peixinho and Sedighe Sajadian and Burgdorf, {Martin J.} and Evans, {Daniel F.} and {Figuera Jaimes}, Roberto and Fujii, {Yuri I.} and Haikala, {Lauri K.} and Christiane Helling and Thomas Henning and Hinse, {Tobias C.} and Luigi Mancini and Penelope Longa-Pe{\~n}a and Sohrab Rahvar and Markus Rabus and Jesper Skottfelt and Colin Snodgrass and John Southworth and Eduardo Unda-Sanzana and {von Essen}, Carolina and Jean-Phillipe Beaulieu and Joshua Blackman and Kym Hill",

year = "2019",

month = sep,

doi = "10.1093/mnras/stz1873",

language = "English",

volume = "488",

pages = "3308--3323",

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

issn = "0035-8711",

publisher = "Oxford University Press",

number = "3",

}

Li, S-S, Zang, W, Udalski, A, Shvartzvald, Y, Huber, D, Lee, C-U, Sumi, T, Gould, A, Mao, S, Fouqué, P, Wang, T, Dong, S, Jørgensen, UG, Cole, A, Mróz, P, Szymański, MK, Skowron, J, Poleski, R, Soszyński, I, Pietrukowicz, P, Kozłowski, S, Ulaczyk, K, Rybicki, KA, Iwanek, P, Yee, JC, Calchi Novati, S, Beichman, CA, Bryden, G, Carey, S, Gaudi, BS, Henderson, CB, Zhu, W, Albrow, MD, Chung, S-J, Han, C, Hwang, K-H, Jung, YK, Ryu, Y-H, Shin, I-G, Cha, S-M, Kim, D-J, Kim, H-W, Kim, S-L, Lee, D-J, Lee, Y, Park, B-G, Pogge, RW, Bond, IA, Abe, F, Barry, R, Bennett, DP, Bhattacharya, A, Donachie, M, Fukui, A, Hirao, Y, Itow, Y, Kondo, I, Koshimoto, N, Li, MCA, Matsubara, Y, Muraki, Y, Miyazaki, S, Nagakane, M, Ranc, C, Rattenbury, NJ, Suematsu, H, Sullivan, DJ, Suzuki, D, Tristram, PJ, Yonehara, A, Christie, G, Drummond, J, Green, J, Hennerley, S, Natusch, T, Porritt, I, Bachelet, E, Maoz, D, Street, RA, Tsapras, Y, Bozza, V, Dominik, M, Hundertmark, M, Peixinho, N, Sajadian, S, Burgdorf, MJ, Evans, DF, Figuera Jaimes, R, Fujii, YI, Haikala, LK, Helling, C, Henning, T, Hinse, TC, Mancini, L, Longa-Peña, P, Rahvar, S, Rabus, M, Skottfelt, J, Snodgrass, C, Southworth, J, Unda-Sanzana, E, von Essen, C, Beaulieu, J-P, Blackman, J & Hill, K 2019, 'OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing', Monthly Notices of the Royal Astronomical Society, vol. 488, no. 3, pp. 3308-3323. https://doi.org/10.1093/mnras/stz1873

TY - JOUR

T1 - OGLE-2017-BLG-1186

T2 - first application of asteroseismology and Gaussian processes to microlensing

AU - Li, Shun-Sheng

AU - Zang, Weicheng

AU - Udalski, Andrzej

AU - Shvartzvald, Yossi

AU - Huber, Daniel

AU - Lee, Chung-Uk

AU - Sumi, Takahiro

AU - Gould, Andrew

AU - Mao, Shude

AU - Fouqué, Pascal

AU - Wang, Tianshu

AU - Dong, Subo

AU - Jørgensen, Uffe G.

AU - Cole, Andrew

AU - Mróz, Przemek

AU - Szymański, Michał K.

AU - Skowron, Jan

AU - Poleski, Radosław

AU - Soszyński, Igor

AU - Pietrukowicz, Paweł

AU - Kozłowski, Szymon

AU - Ulaczyk, Krzysztof

AU - Rybicki, Krzysztof A.

AU - Iwanek, Patryk

AU - Yee, Jennifer C.

AU - Calchi Novati, Sebastiano

AU - Beichman, Charles A.

AU - Bryden, Geoffery

AU - Carey, Sean

AU - Gaudi, B. Scott

AU - Henderson, Calen B.

AU - Zhu, Wei

AU - Albrow, Michael D.

AU - Chung, Sun-Ju

AU - Han, Cheongho

AU - Hwang, Kyu-Ha

AU - Jung, Youn Kil

AU - Ryu, Yoon-Hyun

AU - Shin, In-Gu

AU - Cha, Sang-Mok

AU - Kim, Dong-Jin

AU - Kim, Hyoun-Woo

AU - Kim, Seung-Lee

AU - Lee, Dong-Joo

AU - Lee, Yongseok

AU - Park, Byeong-Gon

AU - Pogge, Richard W.

AU - Bond, Ian A.

AU - Abe, Fumio

AU - Barry, Richard

AU - Bennett, David P.

AU - Bhattacharya, Aparna

AU - Donachie, Martin

AU - Fukui, Akihiko

AU - Hirao, Yuki

AU - Itow, Yoshitaka

AU - Kondo, Iona

AU - Koshimoto, Naoki

AU - Li, Man Cheung Alex

AU - Matsubara, Yutaka

AU - Muraki, Yasushi

AU - Miyazaki, Shota

AU - Nagakane, Masayuki

AU - Ranc, Clément

AU - Rattenbury, Nicholas J.

AU - Suematsu, Haruno

AU - Sullivan, Denis J.

AU - Suzuki, Daisuke

AU - Tristram, Paul J.

AU - Yonehara, Atsunori

AU - Christie, Grant

AU - Drummond, John

AU - Green, Jonathan

AU - Hennerley, Steve

AU - Natusch, Tim

AU - Porritt, Ian

AU - Bachelet, Etienne

AU - Maoz, Dan

AU - Street, Rachel A.

AU - Tsapras, Yiannis

AU - Bozza, Valerio

AU - Dominik, Martin

AU - Hundertmark, Markus

AU - Peixinho, Nuno

AU - Sajadian, Sedighe

AU - Burgdorf, Martin J.

AU - Evans, Daniel F.

AU - Figuera Jaimes, Roberto

AU - Fujii, Yuri I.

AU - Haikala, Lauri K.

AU - Helling, Christiane

AU - Henning, Thomas

AU - Hinse, Tobias C.

AU - Mancini, Luigi

AU - Longa-Peña, Penelope

AU - Rahvar, Sohrab

AU - Rabus, Markus

AU - Skottfelt, Jesper

AU - Snodgrass, Colin

AU - Southworth, John

AU - Unda-Sanzana, Eduardo

AU - von Essen, Carolina

AU - Beaulieu, Jean-Phillipe

AU - Blackman, Joshua

AU - Hill, Kym

PY - 2019/9

Y1 - 2019/9

N2 - We present the analysis of the event OGLE-2017-BLG-1186 from the 2017 Spitzer microlensing campaign. This is a remarkable microlensing event because its source is photometrically bright and variable, which makes it possible to perform an asteroseismic analysis using ground-based data. We find that the source star is an oscillating red giant with average time-scale of ∼9 d. The asteroseismic analysis also provides us source properties including the source angular size (∼27 μas) and distance (∼11.5 kpc), which are essential for inferring the properties of the lens. When fitting the light curve, we test the feasibility of Gaussian processes (GPs) in handling the correlated noise caused by the variable source. We find that the parameters from the GP model are generally more loosely constrained than those from the traditional χ2 minimization method. We note that this event is the first microlensing system for which asteroseismology and GPs have been used to account for the variable source. With both finite-source effect and microlens parallax measured, we find that the lens is likely a ∼0.045 M⊙ brown dwarf at distance ∼9.0 kpc, or a ∼0.073 M⊙ ultracool dwarf at distance ∼9.8 kpc. Combining the estimated lens properties with a Bayesian analysis using a Galactic model, we find a ∼35 per cent probability for the lens to be a bulge object and ∼65 per cent to be a background disc object.

AB - We present the analysis of the event OGLE-2017-BLG-1186 from the 2017 Spitzer microlensing campaign. This is a remarkable microlensing event because its source is photometrically bright and variable, which makes it possible to perform an asteroseismic analysis using ground-based data. We find that the source star is an oscillating red giant with average time-scale of ∼9 d. The asteroseismic analysis also provides us source properties including the source angular size (∼27 μas) and distance (∼11.5 kpc), which are essential for inferring the properties of the lens. When fitting the light curve, we test the feasibility of Gaussian processes (GPs) in handling the correlated noise caused by the variable source. We find that the parameters from the GP model are generally more loosely constrained than those from the traditional χ2 minimization method. We note that this event is the first microlensing system for which asteroseismology and GPs have been used to account for the variable source. With both finite-source effect and microlens parallax measured, we find that the lens is likely a ∼0.045 M⊙ brown dwarf at distance ∼9.0 kpc, or a ∼0.073 M⊙ ultracool dwarf at distance ∼9.8 kpc. Combining the estimated lens properties with a Bayesian analysis using a Galactic model, we find a ∼35 per cent probability for the lens to be a bulge object and ∼65 per cent to be a background disc object.

KW - Asteroseismology

KW - Gravitational lensing: micro

KW - Stars: fundamental parameters

KW - Stars: oscillations

UR - http://adsabs.harvard.edu/abs/2019arXiv190407718L

U2 - 10.1093/mnras/stz1873

DO - 10.1093/mnras/stz1873

M3 - Article

SN - 0035-8711

VL - 488

SP - 3308

EP - 3323

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing

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