OGLE-2019-BLG-0825: constraints on the source system and effect on binary-lens parameters arising from a five day xallarap effect in a candidate planetary microlensing event

Yuki K. Satoh; Naoki Koshimoto; David P. Bennett; Takahiro Sumi; Nicholas J. Rattenbury; Daisuke Suzuki; Shota Miyazaki; Ian A. Bond; Andrzej Udalski; Andrew Gould; Valerio Bozza; Martin Dominik; Yuki Hirao; Iona Kondo; Rintaro Kirikawa; Ryusei Hamada; Fumio Abe; Richard Barry; Aparna Bhattacharya; Hirosane Fujii; Akihiko Fukui; Katsuki Fujita; Tomoya Ikeno; Stela Ishitani Silva; Yoshitaka Itow; Yutaka Matsubara; Sho Matsumoto; Yasushi Muraki; Kosuke Niwa; Arisa Okamura; Greg Olmschenk; Clément Ranc; Taiga Toda; Mio Tomoyoshi; Paul J. Tristram; Aikaterini Vandorou; Hibiki Yama; Kansuke Yamashita; Przemek Mróz; Radosław Poleski; Jan Skowron; Michał K. Szymański; Radek Poleski; Igor Soszyński; Paweł Pietrukowicz; Szymon Kozłowski; Krzysztof Ulaczyk; Krzysztof A. Rybicki; Patryk Iwanek; Marcin Wrona; Mariusz Gromadzki; Michael D. Albrow; Sun-Ju Chung; Cheongho Han; Kyu-Ha Hwang; Doeon Kim; Youn Kil Jung; Hyoun Woo Kim; Yoon-Hyun Ryu; In-Gu Shin; Yossi Shvartzvald; Hongjing Yang; Jennifer C. Yee; Weicheng Zang; Sang-Mok Cha; Dong-Jin Kim; Seung-Lee Kim; Chung-Uk Lee; Dong-Joo Lee; Yongseok Lee; Byeong-Gon Park; Richard W. Pogge; Uffe G. Jørgensen; Penélope Longa-Peña; Sedighe Sajadian; Jesper Skottfelt; Colin Snodgrass; Jeremy Tregloan-Reed; Nanna Bach-Møller; Martin Burgdorf; Giuseppe D'Ago; Lauri Haikala; James Hitchcock; Markus Hundertmark; Elahe Khalouei; Nuno Peixinho; Sohrab Rahvar; John Southworth; Petros Spyratos

doi:10.3847/1538-3881/ace908

OGLE-2019-BLG-0825: constraints on the source system and effect on binary-lens parameters arising from a five day xallarap effect in a candidate planetary microlensing event

Yuki K. Satoh^*
, Naoki Koshimoto
, David P. Bennett
, Takahiro Sumi
, Nicholas J. Rattenbury
, Daisuke Suzuki
, Shota Miyazaki
, Ian A. Bond
, Andrzej Udalski
, Andrew Gould
, Valerio Bozza
, Martin Dominik
, Yuki Hirao
, Iona Kondo
, Rintaro Kirikawa
, Ryusei Hamada
, Fumio Abe
, Richard Barry
, Aparna Bhattacharya
, Hirosane Fujii

Akihiko Fukui, Katsuki Fujita, Tomoya Ikeno, Stela Ishitani Silva, Yoshitaka Itow, Yutaka Matsubara, Sho Matsumoto, Yasushi Muraki, Kosuke Niwa, Arisa Okamura, Greg Olmschenk, Clément Ranc, Taiga Toda, Mio Tomoyoshi, Paul J. Tristram, Aikaterini Vandorou, Hibiki Yama, Kansuke Yamashita, Przemek Mróz, Radosław Poleski, Jan Skowron, Michał K. Szymański, Radek Poleski, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof Ulaczyk, Krzysztof A. Rybicki, Patryk Iwanek, Marcin Wrona, Mariusz Gromadzki, Michael D. Albrow, Sun-Ju Chung, Cheongho Han, Kyu-Ha Hwang, Doeon Kim, Youn Kil Jung, Hyoun Woo Kim, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Hongjing Yang, Jennifer C. Yee, Weicheng Zang, Sang-Mok Cha, Dong-Jin Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Uffe G. Jørgensen, Penélope Longa-Peña, Sedighe Sajadian, Jesper Skottfelt, Colin Snodgrass, Jeremy Tregloan-Reed, Nanna Bach-Møller, Martin Burgdorf, Giuseppe D'Ago, Lauri Haikala, James Hitchcock, Markus Hundertmark, Elahe Khalouei, Nuno Peixinho, Sohrab Rahvar, John Southworth, Petros Spyratos

^*Corresponding author for this work

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

Abstract

We present an analysis of microlensing event OGLE-2019-BLG-0825. This event was identified as a planetary candidate by preliminary modeling. We find that significant residuals from the best-fit static binary-lens model exist and a xallarap effect can fit the residuals very well and significantly improves χ² values. On the other hand, by including the xallarap effect in our models, we find that binary-lens parameters like mass-ratio, q, and separation, s, cannot be constrained well. However, we also find that the parameters for the source system like the orbital period and semi major axis are consistent between all the models we analyzed. We therefore constrain the properties of the source system better than the properties of the lens system. The source system comprises a G-type main-sequence star orbited by a brown dwarf with a period of P ∼ 5 days. This analysis is the first to demonstrate that the xallarap effect does affect binary-lens parameters in planetary events. It would not be common for the presence or absence of the xallarap effect to affect lens parameters in events with long orbital periods of the source system or events with transits to caustics, but in other cases, such as this event, the xallarap effect can affect binary-lens parameters.

Original language	English
Article number	116
Number of pages	15
Journal	Astronomical Journal
Volume	166
Issue number	3
Early online date	18 Aug 2023
DOIs	https://doi.org/10.3847/1538-3881/ace908
Publication status	Published - 1 Sept 2023

Keywords

Gravitational lensing: micro
Brown dwarfs
Xallarap effect

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Satoh_2023_AJ_OGLE-2019-BLG-0825_CC
Copyright © 2023. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Final published version, 1.93 MBLicence: CC BY

http://adsabs.harvard.edu/abs/2023arXiv230714274S

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Satoh, Y. K., Koshimoto, N., Bennett, D. P., Sumi, T., Rattenbury, N. J., Suzuki, D., Miyazaki, S., Bond, I. A., Udalski, A., Gould, A., Bozza, V., Dominik, M., Hirao, Y., Kondo, I., Kirikawa, R., Hamada, R., Abe, F., Barry, R., Bhattacharya, A., ... Spyratos, P. (2023). OGLE-2019-BLG-0825: constraints on the source system and effect on binary-lens parameters arising from a five day xallarap effect in a candidate planetary microlensing event. Astronomical Journal, 166(3), Article 116. https://doi.org/10.3847/1538-3881/ace908

@article{7243b1e3152a43658140c983ed918124,

title = "OGLE-2019-BLG-0825: constraints on the source system and effect on binary-lens parameters arising from a five day xallarap effect in a candidate planetary microlensing event",

abstract = "We present an analysis of microlensing event OGLE-2019-BLG-0825. This event was identified as a planetary candidate by preliminary modeling. We find that significant residuals from the best-fit static binary-lens model exist and a xallarap effect can fit the residuals very well and significantly improves χ2 values. On the other hand, by including the xallarap effect in our models, we find that binary-lens parameters like mass-ratio, q, and separation, s, cannot be constrained well. However, we also find that the parameters for the source system like the orbital period and semi major axis are consistent between all the models we analyzed. We therefore constrain the properties of the source system better than the properties of the lens system. The source system comprises a G-type main-sequence star orbited by a brown dwarf with a period of P ∼ 5 days. This analysis is the first to demonstrate that the xallarap effect does affect binary-lens parameters in planetary events. It would not be common for the presence or absence of the xallarap effect to affect lens parameters in events with long orbital periods of the source system or events with transits to caustics, but in other cases, such as this event, the xallarap effect can affect binary-lens parameters.",

keywords = "Gravitational lensing: micro, Brown dwarfs, Xallarap effect",

author = "Satoh, \{Yuki K.\} and Naoki Koshimoto and Bennett, \{David P.\} and Takahiro Sumi and Rattenbury, \{Nicholas J.\} and Daisuke Suzuki and Shota Miyazaki and Bond, \{Ian A.\} and Andrzej Udalski and Andrew Gould and Valerio Bozza and Martin Dominik and Yuki Hirao and Iona Kondo and Rintaro Kirikawa and Ryusei Hamada and Fumio Abe and Richard Barry and Aparna Bhattacharya and Hirosane Fujii and Akihiko Fukui and Katsuki Fujita and Tomoya Ikeno and \{Ishitani Silva\}, Stela and Yoshitaka Itow and Yutaka Matsubara and Sho Matsumoto and Yasushi Muraki and Kosuke Niwa and Arisa Okamura and Greg Olmschenk and Cl{\'e}ment Ranc and Taiga Toda and Mio Tomoyoshi and Tristram, \{Paul J.\} and Aikaterini Vandorou and Hibiki Yama and Kansuke Yamashita and Przemek Mr{\'o}z and Rados{\l}aw Poleski and Jan Skowron and Szyma{\'n}ski, \{Micha{\l} K.\} and Radek 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 Marcin Wrona and Mariusz Gromadzki and Albrow, \{Michael D.\} and Sun-Ju Chung and Cheongho Han and Kyu-Ha Hwang and Doeon Kim and Jung, \{Youn Kil\} and Kim, \{Hyoun Woo\} and Yoon-Hyun Ryu and In-Gu Shin and Yossi Shvartzvald and Hongjing Yang and Yee, \{Jennifer C.\} and Weicheng Zang and Sang-Mok Cha and Dong-Jin Kim and Seung-Lee Kim and Chung-Uk Lee and Dong-Joo Lee and Yongseok Lee and Byeong-Gon Park and Pogge, \{Richard W.\} and J{\o}rgensen, \{Uffe G.\} and Pen{\'e}lope Longa-Pe{\~n}a and Sedighe Sajadian and Jesper Skottfelt and Colin Snodgrass and Jeremy Tregloan-Reed and Nanna Bach-M{\o}ller and Martin Burgdorf and Giuseppe D'Ago and Lauri Haikala and James Hitchcock and Markus Hundertmark and Elahe Khalouei and Nuno Peixinho and Sohrab Rahvar and John Southworth and Petros Spyratos",

note = "Funding: The MOA project is supported by JSPS KAKENHI Grant Number JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, JP16H06287, and JP17H02871. Y.S. acknowledges support from BSF Grant No. 2020740. J.C.Y. acknowledges support from U.S. NSF Grant No. AST-2108414. U.G.J., N.B-M. and J.S. acknowledge funding from the European Union H2020-MSCA-ITN-2019 under Grant Number 860470 (CHAMELEON), from the Novo Nordisk Foundation Interdisciplinary Synergy Program Grant Number NNF19OC0057374 and from the Carlsberg Foundation under Grant Number CF18-0552. N.P.{\textquoteright}s work was supported by Funda{\c c}{\~a}o para a Ci{\^e}ncia e a Tecnologia (FCT) through the research grants UIDB/04434/2020 and UIDP/04434/2020. P.L.P. was partly funded by “Programa de Iniciaci{\'o}n en Investigaci{\'o}n-Universidad de Antofagasta INI-17-03”. G.D. acknowledges support by ANID, BASAL, FB210003.",

year = "2023",

month = sep,

day = "1",

doi = "10.3847/1538-3881/ace908",

language = "English",

volume = "166",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "3",

}

Satoh, YK, Koshimoto, N, Bennett, DP, Sumi, T, Rattenbury, NJ, Suzuki, D, Miyazaki, S, Bond, IA, Udalski, A, Gould, A, Bozza, V, Dominik, M, Hirao, Y, Kondo, I, Kirikawa, R, Hamada, R, Abe, F, Barry, R, Bhattacharya, A, Fujii, H, Fukui, A, Fujita, K, Ikeno, T, Ishitani Silva, S, Itow, Y, Matsubara, Y, Matsumoto, S, Muraki, Y, Niwa, K, Okamura, A, Olmschenk, G, Ranc, C, Toda, T, Tomoyoshi, M, Tristram, PJ, Vandorou, A, Yama, H, Yamashita, K, Mróz, P, Poleski, R, Skowron, J, Szymański, MK, Poleski, R, Soszyński, I, Pietrukowicz, P, Kozłowski, S, Ulaczyk, K, Rybicki, KA, Iwanek, P, Wrona, M, Gromadzki, M, Albrow, MD, Chung, S-J, Han, C, Hwang, K-H, Kim, D, Jung, YK, Kim, HW, Ryu, Y-H, Shin, I-G, Shvartzvald, Y, Yang, H, Yee, JC, Zang, W, Cha, S-M, Kim, D-J, Kim, S-L, Lee, C-U, Lee, D-J, Lee, Y, Park, B-G, Pogge, RW, Jørgensen, UG, Longa-Peña, P, Sajadian, S, Skottfelt, J, Snodgrass, C, Tregloan-Reed, J, Bach-Møller, N, Burgdorf, M, D'Ago, G, Haikala, L, Hitchcock, J, Hundertmark, M, Khalouei, E, Peixinho, N, Rahvar, S, Southworth, J & Spyratos, P 2023, 'OGLE-2019-BLG-0825: constraints on the source system and effect on binary-lens parameters arising from a five day xallarap effect in a candidate planetary microlensing event', Astronomical Journal, vol. 166, no. 3, 116. https://doi.org/10.3847/1538-3881/ace908

TY - JOUR

T1 - OGLE-2019-BLG-0825

T2 - constraints on the source system and effect on binary-lens parameters arising from a five day xallarap effect in a candidate planetary microlensing event

AU - Satoh, Yuki K.

AU - Koshimoto, Naoki

AU - Bennett, David P.

AU - Sumi, Takahiro

AU - Rattenbury, Nicholas J.

AU - Suzuki, Daisuke

AU - Miyazaki, Shota

AU - Bond, Ian A.

AU - Udalski, Andrzej

AU - Gould, Andrew

AU - Bozza, Valerio

AU - Dominik, Martin

AU - Hirao, Yuki

AU - Kondo, Iona

AU - Kirikawa, Rintaro

AU - Hamada, Ryusei

AU - Abe, Fumio

AU - Barry, Richard

AU - Bhattacharya, Aparna

AU - Fujii, Hirosane

AU - Fukui, Akihiko

AU - Fujita, Katsuki

AU - Ikeno, Tomoya

AU - Ishitani Silva, Stela

AU - Itow, Yoshitaka

AU - Matsubara, Yutaka

AU - Matsumoto, Sho

AU - Muraki, Yasushi

AU - Niwa, Kosuke

AU - Okamura, Arisa

AU - Olmschenk, Greg

AU - Ranc, Clément

AU - Toda, Taiga

AU - Tomoyoshi, Mio

AU - Tristram, Paul J.

AU - Vandorou, Aikaterini

AU - Yama, Hibiki

AU - Yamashita, Kansuke

AU - Mróz, Przemek

AU - Poleski, Radosław

AU - Skowron, Jan

AU - Szymański, Michał K.

AU - Poleski, Radek

AU - Soszyński, Igor

AU - Pietrukowicz, Paweł

AU - Kozłowski, Szymon

AU - Ulaczyk, Krzysztof

AU - Rybicki, Krzysztof A.

AU - Iwanek, Patryk

AU - Wrona, Marcin

AU - Gromadzki, Mariusz

AU - Albrow, Michael D.

AU - Chung, Sun-Ju

AU - Han, Cheongho

AU - Hwang, Kyu-Ha

AU - Kim, Doeon

AU - Jung, Youn Kil

AU - Kim, Hyoun Woo

AU - Ryu, Yoon-Hyun

AU - Shin, In-Gu

AU - Shvartzvald, Yossi

AU - Yang, Hongjing

AU - Yee, Jennifer C.

AU - Zang, Weicheng

AU - Cha, Sang-Mok

AU - Kim, Dong-Jin

AU - Kim, Seung-Lee

AU - Lee, Chung-Uk

AU - Lee, Dong-Joo

AU - Lee, Yongseok

AU - Park, Byeong-Gon

AU - Pogge, Richard W.

AU - Jørgensen, Uffe G.

AU - Longa-Peña, Penélope

AU - Sajadian, Sedighe

AU - Skottfelt, Jesper

AU - Snodgrass, Colin

AU - Tregloan-Reed, Jeremy

AU - Bach-Møller, Nanna

AU - Burgdorf, Martin

AU - D'Ago, Giuseppe

AU - Haikala, Lauri

AU - Hitchcock, James

AU - Hundertmark, Markus

AU - Khalouei, Elahe

AU - Peixinho, Nuno

AU - Rahvar, Sohrab

AU - Southworth, John

AU - Spyratos, Petros

N1 - Funding: The MOA project is supported by JSPS KAKENHI Grant Number JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, JP16H06287, and JP17H02871. Y.S. acknowledges support from BSF Grant No. 2020740. J.C.Y. acknowledges support from U.S. NSF Grant No. AST-2108414. U.G.J., N.B-M. and J.S. acknowledge funding from the European Union H2020-MSCA-ITN-2019 under Grant Number 860470 (CHAMELEON), from the Novo Nordisk Foundation Interdisciplinary Synergy Program Grant Number NNF19OC0057374 and from the Carlsberg Foundation under Grant Number CF18-0552. N.P.’s work was supported by Fundação para a Ciência e a Tecnologia (FCT) through the research grants UIDB/04434/2020 and UIDP/04434/2020. P.L.P. was partly funded by “Programa de Iniciación en Investigación-Universidad de Antofagasta INI-17-03”. G.D. acknowledges support by ANID, BASAL, FB210003.

PY - 2023/9/1

Y1 - 2023/9/1

N2 - We present an analysis of microlensing event OGLE-2019-BLG-0825. This event was identified as a planetary candidate by preliminary modeling. We find that significant residuals from the best-fit static binary-lens model exist and a xallarap effect can fit the residuals very well and significantly improves χ2 values. On the other hand, by including the xallarap effect in our models, we find that binary-lens parameters like mass-ratio, q, and separation, s, cannot be constrained well. However, we also find that the parameters for the source system like the orbital period and semi major axis are consistent between all the models we analyzed. We therefore constrain the properties of the source system better than the properties of the lens system. The source system comprises a G-type main-sequence star orbited by a brown dwarf with a period of P ∼ 5 days. This analysis is the first to demonstrate that the xallarap effect does affect binary-lens parameters in planetary events. It would not be common for the presence or absence of the xallarap effect to affect lens parameters in events with long orbital periods of the source system or events with transits to caustics, but in other cases, such as this event, the xallarap effect can affect binary-lens parameters.

AB - We present an analysis of microlensing event OGLE-2019-BLG-0825. This event was identified as a planetary candidate by preliminary modeling. We find that significant residuals from the best-fit static binary-lens model exist and a xallarap effect can fit the residuals very well and significantly improves χ2 values. On the other hand, by including the xallarap effect in our models, we find that binary-lens parameters like mass-ratio, q, and separation, s, cannot be constrained well. However, we also find that the parameters for the source system like the orbital period and semi major axis are consistent between all the models we analyzed. We therefore constrain the properties of the source system better than the properties of the lens system. The source system comprises a G-type main-sequence star orbited by a brown dwarf with a period of P ∼ 5 days. This analysis is the first to demonstrate that the xallarap effect does affect binary-lens parameters in planetary events. It would not be common for the presence or absence of the xallarap effect to affect lens parameters in events with long orbital periods of the source system or events with transits to caustics, but in other cases, such as this event, the xallarap effect can affect binary-lens parameters.

KW - Gravitational lensing: micro

KW - Brown dwarfs

KW - Xallarap effect

U2 - 10.3847/1538-3881/ace908

DO - 10.3847/1538-3881/ace908

M3 - Article

SN - 0004-6256

VL - 166

JO - Astronomical Journal

JF - Astronomical Journal

IS - 3

M1 - 116

ER -

OGLE-2019-BLG-0825: constraints on the source system and effect on binary-lens parameters arising from a five day xallarap effect in a candidate planetary microlensing event

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