OGLE-2016-BLG-1227L: A Wide-separation Planet from a Very Short-timescale Microlensing Event

Cheongho Han; Andrzej Udalski; Andrew Gould; Andrew Gould; Michael D. Albrow; Sun Ju Chung; Sun Ju Chung; Kyu Ha Hwang; Youn Kil Jung; Chung Uk Lee; Yoon Hyun Ryu; In Gu Shin; Yossi Shvartzvald; Jennifer C. Yee; Weicheng Zang; Sang Mok Cha; Sang Mok Cha; Dong Jin Kim; Hyoun Woo Kim; Seung Lee Kim; Seung Lee Kim; Dong Joo Lee; Yongseok Lee; Yongseok Lee; Byeong Gon Park; Richard W. Pogge; M. James Jee; M. James Jee; Doeon Kim; Chun Hwey Kim; Woong Tae Kim; Przemek Mróz; Przemek Mróz; Michał K. Szymański; Jan Skowron; Radek Poleski; Radek Poleski; Igor Soszyński; Paweł Pietrukowicz; Szymon Kozłowski; Krzysztof Ulaczyk

doi:10.3847/1538-3881/ab6a9f

OGLE-2016-BLG-1227L: A Wide-separation Planet from a Very Short-timescale Microlensing Event

Cheongho Han, Andrzej Udalski, Andrew Gould, Andrew Gould, Michael D. Albrow, Sun Ju Chung, Sun Ju Chung, Kyu Ha Hwang, Youn Kil Jung, Chung Uk Lee, Yoon Hyun Ryu, In Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Weicheng Zang, Sang Mok Cha, Sang Mok Cha, Dong Jin Kim, Hyoun Woo Kim, Seung Lee KimSeung Lee Kim, Dong Joo Lee, Yongseok Lee, Yongseok Lee, Byeong Gon Park, Richard W. Pogge, M. James Jee, M. James Jee, Doeon Kim, Chun Hwey Kim, Woong Tae Kim, Przemek Mróz, Przemek Mróz, Michał K. Szymański, Jan Skowron, Radek Poleski, Radek Poleski, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof Ulaczyk

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12 Citations (Scopus)

Abstract

We present the analysis of the microlensing event OGLE-2016-BLG-1227. The light curve of this short-duration event appears to be a single-lens event affected by severe finite-source effects. Analysis of the light curve based on a single-lens single-source (1L1S) model yields very small values of the event timescale days, and the angular Einstein radius, mas, making the lens a candidate of a free-floating planet. Close inspection reveals that the 1L1S solution leaves small residuals with an amplitude of ΔI ≲ 0.03 mag. We find that the residuals are explained by the existence of an additional widely separated heavier lens component, indicating that the lens is a wide-separation planetary system rather than a free-floating planet. From Bayesian analysis, it is estimated that the planet has a mass of and it is orbiting a low-mass host star with a mass of ocated with a projected separation of au. The planetary system is located in the Galactic bulge with a line-of-sight separation from the source star of kpc. The event shows that there is a range of deviations in the signatures of host stars for apparently isolated planetary lensing events and that it is possible to identify a host even when a deviation is subtle.

Original language	English
Article number	91
Journal	Astronomical Journal
Volume	159
Issue number	3
DOIs	https://doi.org/10.3847/1538-3881/ab6a9f
Publication status	Published - 2020 Mar 1

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© 2020. The American Astronomical Society. All rights reserved..

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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Han, C., Udalski, A., Gould, A., Gould, A., Albrow, M. D., Chung, S. J., Chung, S. J., Hwang, K. H., Jung, Y. K., Lee, C. U., Ryu, Y. H., Shin, I. G., Shvartzvald, Y., Yee, J. C., Zang, W., Cha, S. M., Cha, S. M., Kim, D. J., Kim, H. W., ... Ulaczyk, K. (2020). OGLE-2016-BLG-1227L: A Wide-separation Planet from a Very Short-timescale Microlensing Event. Astronomical Journal, 159(3), [91]. https://doi.org/10.3847/1538-3881/ab6a9f

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title = "OGLE-2016-BLG-1227L: A Wide-separation Planet from a Very Short-timescale Microlensing Event",

abstract = "We present the analysis of the microlensing event OGLE-2016-BLG-1227. The light curve of this short-duration event appears to be a single-lens event affected by severe finite-source effects. Analysis of the light curve based on a single-lens single-source (1L1S) model yields very small values of the event timescale days, and the angular Einstein radius, mas, making the lens a candidate of a free-floating planet. Close inspection reveals that the 1L1S solution leaves small residuals with an amplitude of ΔI ≲ 0.03 mag. We find that the residuals are explained by the existence of an additional widely separated heavier lens component, indicating that the lens is a wide-separation planetary system rather than a free-floating planet. From Bayesian analysis, it is estimated that the planet has a mass of and it is orbiting a low-mass host star with a mass of ocated with a projected separation of au. The planetary system is located in the Galactic bulge with a line-of-sight separation from the source star of kpc. The event shows that there is a range of deviations in the signatures of host stars for apparently isolated planetary lensing events and that it is possible to identify a host even when a deviation is subtle.",

author = "Cheongho Han and Andrzej Udalski and Andrew Gould and Andrew Gould and Albrow, {Michael D.} and Chung, {Sun Ju} and Chung, {Sun Ju} and Hwang, {Kyu Ha} and Jung, {Youn Kil} and Lee, {Chung Uk} and Ryu, {Yoon Hyun} and Shin, {In Gu} and Yossi Shvartzvald and Yee, {Jennifer C.} and Weicheng Zang and Cha, {Sang Mok} and Cha, {Sang Mok} and Kim, {Dong Jin} and Kim, {Hyoun Woo} and Kim, {Seung Lee} and Kim, {Seung Lee} and Lee, {Dong Joo} and Yongseok Lee and Yongseok Lee and Park, {Byeong Gon} and Pogge, {Richard W.} and Jee, {M. James} and Jee, {M. James} and Doeon Kim and Kim, {Chun Hwey} and Kim, {Woong Tae} and Przemek Mr{\'o}z and Przemek Mr{\'o}z and Szyma{\'n}ski, {Micha{\l} K.} and Jan Skowron and Radek Poleski and Radek Poleski and Igor Soszy{\'n}ski and Pawe{\l} Pietrukowicz and Szymon Koz{\l}owski and Krzysztof Ulaczyk",

year = "2020",

month = mar,

day = "1",

doi = "10.3847/1538-3881/ab6a9f",

language = "English",

volume = "159",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "IOP Publishing Ltd.",

number = "3",

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Han, C, Udalski, A, Gould, A, Gould, A, Albrow, MD, Chung, SJ, Chung, SJ, Hwang, KH, Jung, YK, Lee, CU, Ryu, YH, Shin, IG, Shvartzvald, Y, Yee, JC, Zang, W, Cha, SM, Cha, SM, Kim, DJ, Kim, HW, Kim, SL, Kim, SL, Lee, DJ, Lee, Y, Lee, Y, Park, BG, Pogge, RW, Jee, MJ, Jee, MJ, Kim, D, Kim, CH, Kim, WT, Mróz, P, Mróz, P, Szymański, MK, Skowron, J, Poleski, R, Poleski, R, Soszyński, I, Pietrukowicz, P, Kozłowski, S & Ulaczyk, K 2020, 'OGLE-2016-BLG-1227L: A Wide-separation Planet from a Very Short-timescale Microlensing Event', Astronomical Journal, vol. 159, no. 3, 91. https://doi.org/10.3847/1538-3881/ab6a9f

TY - JOUR

T1 - OGLE-2016-BLG-1227L

T2 - A Wide-separation Planet from a Very Short-timescale Microlensing Event

AU - Han, Cheongho

AU - Udalski, Andrzej

AU - Gould, Andrew

AU - Albrow, Michael D.

AU - Chung, Sun Ju

AU - Hwang, Kyu Ha

AU - Jung, Youn Kil

AU - Lee, Chung Uk

AU - Ryu, Yoon Hyun

AU - Shin, In Gu

AU - Shvartzvald, Yossi

AU - Yee, Jennifer C.

AU - Zang, Weicheng

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 - Jee, M. James

AU - Kim, Doeon

AU - Kim, Chun Hwey

AU - Kim, Woong Tae

AU - Mróz, Przemek

AU - Szymański, Michał K.

AU - Skowron, Jan

AU - Poleski, Radek

AU - Soszyński, Igor

AU - Pietrukowicz, Paweł

AU - Kozłowski, Szymon

AU - Ulaczyk, Krzysztof

PY - 2020/3/1

Y1 - 2020/3/1

N2 - We present the analysis of the microlensing event OGLE-2016-BLG-1227. The light curve of this short-duration event appears to be a single-lens event affected by severe finite-source effects. Analysis of the light curve based on a single-lens single-source (1L1S) model yields very small values of the event timescale days, and the angular Einstein radius, mas, making the lens a candidate of a free-floating planet. Close inspection reveals that the 1L1S solution leaves small residuals with an amplitude of ΔI ≲ 0.03 mag. We find that the residuals are explained by the existence of an additional widely separated heavier lens component, indicating that the lens is a wide-separation planetary system rather than a free-floating planet. From Bayesian analysis, it is estimated that the planet has a mass of and it is orbiting a low-mass host star with a mass of ocated with a projected separation of au. The planetary system is located in the Galactic bulge with a line-of-sight separation from the source star of kpc. The event shows that there is a range of deviations in the signatures of host stars for apparently isolated planetary lensing events and that it is possible to identify a host even when a deviation is subtle.

AB - We present the analysis of the microlensing event OGLE-2016-BLG-1227. The light curve of this short-duration event appears to be a single-lens event affected by severe finite-source effects. Analysis of the light curve based on a single-lens single-source (1L1S) model yields very small values of the event timescale days, and the angular Einstein radius, mas, making the lens a candidate of a free-floating planet. Close inspection reveals that the 1L1S solution leaves small residuals with an amplitude of ΔI ≲ 0.03 mag. We find that the residuals are explained by the existence of an additional widely separated heavier lens component, indicating that the lens is a wide-separation planetary system rather than a free-floating planet. From Bayesian analysis, it is estimated that the planet has a mass of and it is orbiting a low-mass host star with a mass of ocated with a projected separation of au. The planetary system is located in the Galactic bulge with a line-of-sight separation from the source star of kpc. The event shows that there is a range of deviations in the signatures of host stars for apparently isolated planetary lensing events and that it is possible to identify a host even when a deviation is subtle.

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U2 - 10.3847/1538-3881/ab6a9f

DO - 10.3847/1538-3881/ab6a9f

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ER -

OGLE-2016-BLG-1227L: A Wide-separation Planet from a Very Short-timescale Microlensing Event

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