Gaia22dkvLb: a microlensing planet potentially accessible to radial-velocity characterization

Zexuan Wu; Subo Dong; Tuan Yi; Zhuokai Liu; Kareem El-Badry; Andrew Gould; L. Wyrzykowski; K. A. Rybicki; Etienne Bachelet; Grant W. Christie; L. de Almeida; L. A. G. Monard; J. McCormick; Tim Natusch; P. Zielinski; Huiling Chen; Yang Huang; Chang Liu; A. Merand; Przemek Mroz; Jinyi Shangguan; Andrzej Udalski; J. Woillez; Huawei Zhang; Franz-Josef Hambsch; P. J. Mikolajczyk; M. Gromadzki; M. Ratajczak; Katarzyna Kruszynska; N. Ihanec; Uliana Pylypenko; M. Sitek; K. Howil; Staszek Zola; Olga Michniewicz; Michal Zejmo; Fraser Lewis; Mateusz Bronikowski; Stephen Potter; Jan Andrzejewski; Jaroslav Merc; Rachel Street; Akihiko Fukui; R. Figuera Jaimes; V. Bozza; P. Rota; A. Cassan; M. Dominik; Y. Tsapras; M. Hundertmark; J. Wambsganss; K. Bakowska; A. Slowikowska

doi:10.3847/1538-3881/ad5203

Gaia22dkvLb: a microlensing planet potentially accessible to radial-velocity characterization

Zexuan Wu, Subo Dong^*, Tuan Yi, Zhuokai Liu, Kareem El-Badry, Andrew Gould, L. Wyrzykowski, K. A. Rybicki, Etienne Bachelet, Grant W. Christie, L. de Almeida, L. A. G. Monard, J. McCormick, Tim Natusch, P. Zielinski, Huiling Chen, Yang Huang, Chang Liu, A. Merand, Przemek MrozJinyi Shangguan, Andrzej Udalski, J. Woillez, Huawei Zhang, Franz-Josef Hambsch, P. J. Mikolajczyk, M. Gromadzki, M. Ratajczak, Katarzyna Kruszynska, N. Ihanec, Uliana Pylypenko, M. Sitek, K. Howil, Staszek Zola, Olga Michniewicz, Michal Zejmo, Fraser Lewis, Mateusz Bronikowski, Stephen Potter, Jan Andrzejewski, Jaroslav Merc, Rachel Street, Akihiko Fukui, R. Figuera Jaimes, V. Bozza, P. Rota, A. Cassan, M. Dominik, Y. Tsapras, M. Hundertmark, J. Wambsganss, K. Bakowska, A. Slowikowska

^*Corresponding author for this work

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

Abstract

We report discovering an exoplanet from following up a microlensing event alerted by Gaia. The event Gaia22dkv is toward a disk source rather than the traditional bulge microlensing fields. Our primary analysis yields a Jovian planet with M_p = 0.59^+0.15_-0.05 M_J at a projected orbital separation r_⊥= 1.4^+0.8_-0.3 au, and the host is a ~1.1 M_⊙ turnoff star at ~1.3 kpc. At r' ≈ 14, the host is far brighter than any previously discovered microlensing planet host, opening up the opportunity to test the microlensing model with radial velocity (RV) observations. RV data can be used to measure the planet's orbital period and eccentricity, and they also enable searching for inner planets of the microlensing cold Jupiter, as expected from the "inner-outer correlation" inferred from Kepler and RV discoveries. Furthermore, we show that Gaia astrometric microlensing will not only allow precise measurements of its angular Einstein radius θ_E, but also directly measure the microlens parallax vector and unambiguously break a geometric light-curve degeneracy, leading to definitive characterization of the lens system.

Original language	English
Article number	62
Number of pages	17
Journal	Astronomical Journal
Volume	168
Issue number	2
Early online date	9 Jul 2024
DOIs	https://doi.org/10.3847/1538-3881/ad5203
Publication status	Published - 1 Aug 2024

Keywords

Gravitational microlensing exoplanet detection

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Wu_2024_AJ_Gaia22dkvLb-microlensing-planet-radial-velocity-characterization_CC
Copyright © 2024. 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.
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https://arxiv.org/pdf/2309.03944

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Wu, Z., Dong, S., Yi, T., Liu, Z., El-Badry, K., Gould, A., Wyrzykowski, L., Rybicki, K. A., Bachelet, E., Christie, G. W., de Almeida, L., Monard, L. A. G., McCormick, J., Natusch, T., Zielinski, P., Chen, H., Huang, Y., Liu, C., Merand, A., ... Slowikowska, A. (2024). Gaia22dkvLb: a microlensing planet potentially accessible to radial-velocity characterization. Astronomical Journal, 168(2), Article 62. https://doi.org/10.3847/1538-3881/ad5203

@article{9728dde4f74949de8e04395fe693a9e2,

title = "Gaia22dkvLb: a microlensing planet potentially accessible to radial-velocity characterization",

abstract = "We report discovering an exoplanet from following up a microlensing event alerted by Gaia. The event Gaia22dkv is toward a disk source rather than the traditional bulge microlensing fields. Our primary analysis yields a Jovian planet with Mp = 0.59+0.15-0.05 MJ at a projected orbital separation r⊥ = 1.4+0.8-0.3 au, and the host is a ~1.1 M⊙ turnoff star at ~1.3 kpc. At r' ≈ 14, the host is far brighter than any previously discovered microlensing planet host, opening up the opportunity to test the microlensing model with radial velocity (RV) observations. RV data can be used to measure the planet's orbital period and eccentricity, and they also enable searching for inner planets of the microlensing cold Jupiter, as expected from the {"}inner-outer correlation{"} inferred from Kepler and RV discoveries. Furthermore, we show that Gaia astrometric microlensing will not only allow precise measurements of its angular Einstein radius θE, but also directly measure the microlens parallax vector and unambiguously break a geometric light-curve degeneracy, leading to definitive characterization of the lens system. ",

keywords = "Gravitational microlensing exoplanet detection",

author = "Zexuan Wu and Subo Dong and Tuan Yi and Zhuokai Liu and Kareem El-Badry and Andrew Gould and L. Wyrzykowski and Rybicki, {K. A.} and Etienne Bachelet and Christie, {Grant W.} and {de Almeida}, L. and Monard, {L. A. G.} and J. McCormick and Tim Natusch and P. Zielinski and Huiling Chen and Yang Huang and Chang Liu and A. Merand and Przemek Mroz and Jinyi Shangguan and Andrzej Udalski and J. Woillez and Huawei Zhang and Franz-Josef Hambsch and Mikolajczyk, {P. J.} and M. Gromadzki and M. Ratajczak and Katarzyna Kruszynska and N. Ihanec and Uliana Pylypenko and M. Sitek and K. Howil and Staszek Zola and Olga Michniewicz and Michal Zejmo and Fraser Lewis and Mateusz Bronikowski and Stephen Potter and Jan Andrzejewski and Jaroslav Merc and Rachel Street and Akihiko Fukui and Jaimes, {R. Figuera} and V. Bozza and P. Rota and A. Cassan and M. Dominik and Y. Tsapras and M. Hundertmark and J. Wambsganss and K. Bakowska and A. Slowikowska",

note = "Funding: This work is supported by the National Key R&D Program of China No. 2019YFA0405100, the National Natural Science Foundation of China (grant No. 12133005), and the science research grants from the China Manned Space Project with No. CMS-CSST2021-B12. S.D. acknowledges the New Cornerstone Science Foundation through the XPLORER PRIZE. R.A.S. and E.B. gratefully acknowledge funding from NASA award 80NSSC19K029. R.F.J. acknowledges support for this project provided by ANID{\textquoteright}s Millennium Science Initiative through grant ICN12_009, awarded to the Millennium Institute of Astrophysics (MAS), and by ANID{\textquoteright}s Basal project FB210003. Y.T. acknowledges the support of the DFG priority program SPP 1992 “Exploring the Diversity of Extrasolar Planets” (TS 356/3-1). This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the TAP member institutes. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. These observations are associated with program 16871. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www. cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC; https://www.cosmos.esa. int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular, the institutions participating in the Gaia Multilateral Agreement. This research has made use of the VizieR catalog access tool, CDS, Strasbourg, France. This work uses observations made at the Observatorio do Pico dos Dias/LNA (Brazil). Some of the observations reported in this paper were obtained with the Southern African Large Telescope (SALT). Polish participation in SALT is funded by grant No. MEiN nr 2021/WK/01. This project has received funding from the EU Horizon 2020 research and innovation program under grant agreement No. 101004719 (OPTICON-RadioNet Pilot). This research was supported by the Polish National Science Centre grant No. 2017/25/B/ST9/02805. We acknowledge ESA Gaia, DPAC, and the Photometric Science Alerts Team (http://gsaweb.ast. cam.ac.uk/alerts).",

year = "2024",

month = aug,

day = "1",

doi = "10.3847/1538-3881/ad5203",

language = "English",

volume = "168",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "2",

}

Wu, Z, Dong, S, Yi, T, Liu, Z, El-Badry, K, Gould, A, Wyrzykowski, L, Rybicki, KA, Bachelet, E, Christie, GW, de Almeida, L, Monard, LAG, McCormick, J, Natusch, T, Zielinski, P, Chen, H, Huang, Y, Liu, C, Merand, A, Mroz, P, Shangguan, J, Udalski, A, Woillez, J, Zhang, H, Hambsch, F-J, Mikolajczyk, PJ, Gromadzki, M, Ratajczak, M, Kruszynska, K, Ihanec, N, Pylypenko, U, Sitek, M, Howil, K, Zola, S, Michniewicz, O, Zejmo, M, Lewis, F, Bronikowski, M, Potter, S, Andrzejewski, J, Merc, J, Street, R, Fukui, A, Jaimes, RF, Bozza, V, Rota, P, Cassan, A, Dominik, M, Tsapras, Y, Hundertmark, M, Wambsganss, J, Bakowska, K & Slowikowska, A 2024, 'Gaia22dkvLb: a microlensing planet potentially accessible to radial-velocity characterization', Astronomical Journal, vol. 168, no. 2, 62. https://doi.org/10.3847/1538-3881/ad5203

TY - JOUR

T1 - Gaia22dkvLb

T2 - a microlensing planet potentially accessible to radial-velocity characterization

AU - Wu, Zexuan

AU - Dong, Subo

AU - Yi, Tuan

AU - Liu, Zhuokai

AU - El-Badry, Kareem

AU - Gould, Andrew

AU - Wyrzykowski, L.

AU - Rybicki, K. A.

AU - Bachelet, Etienne

AU - Christie, Grant W.

AU - de Almeida, L.

AU - Monard, L. A. G.

AU - McCormick, J.

AU - Natusch, Tim

AU - Zielinski, P.

AU - Chen, Huiling

AU - Huang, Yang

AU - Liu, Chang

AU - Merand, A.

AU - Mroz, Przemek

AU - Shangguan, Jinyi

AU - Udalski, Andrzej

AU - Woillez, J.

AU - Zhang, Huawei

AU - Hambsch, Franz-Josef

AU - Mikolajczyk, P. J.

AU - Gromadzki, M.

AU - Ratajczak, M.

AU - Kruszynska, Katarzyna

AU - Ihanec, N.

AU - Pylypenko, Uliana

AU - Sitek, M.

AU - Howil, K.

AU - Zola, Staszek

AU - Michniewicz, Olga

AU - Zejmo, Michal

AU - Lewis, Fraser

AU - Bronikowski, Mateusz

AU - Potter, Stephen

AU - Andrzejewski, Jan

AU - Merc, Jaroslav

AU - Street, Rachel

AU - Fukui, Akihiko

AU - Jaimes, R. Figuera

AU - Bozza, V.

AU - Rota, P.

AU - Cassan, A.

AU - Dominik, M.

AU - Tsapras, Y.

AU - Hundertmark, M.

AU - Wambsganss, J.

AU - Bakowska, K.

AU - Slowikowska, A.

N1 - Funding: This work is supported by the National Key R&D Program of China No. 2019YFA0405100, the National Natural Science Foundation of China (grant No. 12133005), and the science research grants from the China Manned Space Project with No. CMS-CSST2021-B12. S.D. acknowledges the New Cornerstone Science Foundation through the XPLORER PRIZE. R.A.S. and E.B. gratefully acknowledge funding from NASA award 80NSSC19K029. R.F.J. acknowledges support for this project provided by ANID’s Millennium Science Initiative through grant ICN12_009, awarded to the Millennium Institute of Astrophysics (MAS), and by ANID’s Basal project FB210003. Y.T. acknowledges the support of the DFG priority program SPP 1992 “Exploring the Diversity of Extrasolar Planets” (TS 356/3-1). This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the TAP member institutes. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. These observations are associated with program 16871. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www. cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC; https://www.cosmos.esa. int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular, the institutions participating in the Gaia Multilateral Agreement. This research has made use of the VizieR catalog access tool, CDS, Strasbourg, France. This work uses observations made at the Observatorio do Pico dos Dias/LNA (Brazil). Some of the observations reported in this paper were obtained with the Southern African Large Telescope (SALT). Polish participation in SALT is funded by grant No. MEiN nr 2021/WK/01. This project has received funding from the EU Horizon 2020 research and innovation program under grant agreement No. 101004719 (OPTICON-RadioNet Pilot). This research was supported by the Polish National Science Centre grant No. 2017/25/B/ST9/02805. We acknowledge ESA Gaia, DPAC, and the Photometric Science Alerts Team (http://gsaweb.ast. cam.ac.uk/alerts).

PY - 2024/8/1

Y1 - 2024/8/1

N2 - We report discovering an exoplanet from following up a microlensing event alerted by Gaia. The event Gaia22dkv is toward a disk source rather than the traditional bulge microlensing fields. Our primary analysis yields a Jovian planet with Mp = 0.59+0.15-0.05 MJ at a projected orbital separation r⊥ = 1.4+0.8-0.3 au, and the host is a ~1.1 M⊙ turnoff star at ~1.3 kpc. At r' ≈ 14, the host is far brighter than any previously discovered microlensing planet host, opening up the opportunity to test the microlensing model with radial velocity (RV) observations. RV data can be used to measure the planet's orbital period and eccentricity, and they also enable searching for inner planets of the microlensing cold Jupiter, as expected from the "inner-outer correlation" inferred from Kepler and RV discoveries. Furthermore, we show that Gaia astrometric microlensing will not only allow precise measurements of its angular Einstein radius θE, but also directly measure the microlens parallax vector and unambiguously break a geometric light-curve degeneracy, leading to definitive characterization of the lens system.

AB - We report discovering an exoplanet from following up a microlensing event alerted by Gaia. The event Gaia22dkv is toward a disk source rather than the traditional bulge microlensing fields. Our primary analysis yields a Jovian planet with Mp = 0.59+0.15-0.05 MJ at a projected orbital separation r⊥ = 1.4+0.8-0.3 au, and the host is a ~1.1 M⊙ turnoff star at ~1.3 kpc. At r' ≈ 14, the host is far brighter than any previously discovered microlensing planet host, opening up the opportunity to test the microlensing model with radial velocity (RV) observations. RV data can be used to measure the planet's orbital period and eccentricity, and they also enable searching for inner planets of the microlensing cold Jupiter, as expected from the "inner-outer correlation" inferred from Kepler and RV discoveries. Furthermore, we show that Gaia astrometric microlensing will not only allow precise measurements of its angular Einstein radius θE, but also directly measure the microlens parallax vector and unambiguously break a geometric light-curve degeneracy, leading to definitive characterization of the lens system.

KW - Gravitational microlensing exoplanet detection

U2 - 10.3847/1538-3881/ad5203

DO - 10.3847/1538-3881/ad5203

M3 - Article

SN - 0004-6256

VL - 168

JO - Astronomical Journal

JF - Astronomical Journal

IS - 2

M1 - 62

ER -

Gaia22dkvLb: a microlensing planet potentially accessible to radial-velocity characterization

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