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

Li, Shun-Sheng; Zang, Weicheng; Udalski, Andrzej; Shvartzvald, Yossi; Huber, Daniel; Lee, Chung-Uk; Sumi, Takahiro; Gould, Andrew; Mao, Shude; Fouqué, Pascal; Wang, Tianshu; Dong, Subo; Jørgensen, Uffe G.; Cole, Andrew; Mróz, Przemek; Szymański, Michał K.; Skowron, Jan; Poleski, Radosław; Soszyński, Igor; Pietrukowicz, Paweł; Kozłowski, Szymon; Ulaczyk, Krzysztof; Rybicki, Krzysztof A.; Iwanek, Patryk; Yee, Jennifer C.; Calchi Novati, Sebastiano; Beichman, Charles A.; Bryden, Geoffery; Carey, Sean; Scott Gaudi, B.; Henderson, Calen B.; Zhu, Wei; Albrow, Michael D.; Chung, Sun-Ju; Han, Cheongho; Hwang, Kyu-Ha; Kil Jung, Youn; Ryu, Yoon-Hyun; Shin, In-Gu; Cha, Sang-Mok; Kim, Dong-Jin; Kim, Hyoun-Woo; Kim, Seung-Lee; Lee, Dong-Joo; Lee, Yongseok; Park, Byeong-Gon; Pogge, Richard W.; Bond, Ian A.; Abe, Fumio; Barry, Richard; Bennett, David P.; Bhattacharya, Aparna; Donachie, Martin; Fukui, Akihiko; Hirao, Yuki; Itow, Yoshitaka; Kondo, Iona; Koshimoto, Naoki; Cheung Alex Li, Man; Matsubara,...

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Authors

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

Eduardo Unda-Sanzana

Carolina von Essen

Jean-Phillipe Beaulieu

Joshua Blackman

Kym Hill



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 ?2 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.

Journal Article Type Article
Acceptance Date Jul 3, 2019
Online Publication Date Jul 10, 2019
Publication Date Sep 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 488
Issue 3
Pages 3308-3323
DOI https://doi.org/10.1093/mnras/stz1873
Keywords asteroseismology – gravitational lensing: micro – stars: fundamentalparameters – stars: oscillations
Publisher URL https://academic.oup.com/mnras/article/488/3/3308/5530797

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