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Spectroscopic Mass and Host-star Metallicity Measurements for Newly Discovered Microlensing Planet OGLE-2018-BLG-0740Lb

MPS-Authors

Han,  Cheongho
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yee,  Jennifer C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Udalski,  Andrzej
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bond,  Ian A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bozza,  Valerio
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cassan,  Arnaud
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hirao,  Yuki
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dong,  Subo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kollmeier,  Juna A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Morrell,  Nidia
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Boutsia,  Konstantina
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

authors,  Leading
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Albrow,  Michael D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chung,  Sun-Ju
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gould,  Andrew
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hwang,  Kyu-Ha
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee,  Chung-Uk
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ryu,  Yoon-Hyun
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shin,  In-Gu
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shvartzvald,  Yossi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jung,  Youn Kil
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  Doeon
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  Woong-Tae
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cha,  Sang-Mok
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  Dong-Jin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  Hyoun-Woo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hong,  Kyeongsoo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  Seung-Lee
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee,  Dong-Joo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee,  Yongseok
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Park,  Byeong-Gon
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pogge,  Richard W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zang,  Weicheng
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collaboration,  The KMTNet
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mróz,  Przemek
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Szymański,  Michał K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Skowron,  Jan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Poleski,  Radek
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Soszyński,  Igor
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pietrukowicz,  Paweł
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kozłowski,  Szymon
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ulaczyk,  Krzysztof
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rybicki,  Krzysztof A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Iwanek,  Patryk
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wrona,  Marcin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collaboration,  The OGLE
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Abe,  Fumio
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Barry,  Richard
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bennett,  David P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bhattacharya,  Aparna
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Donachie,  Martin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fukui,  Akihiko
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Itow,  Yoshitaka
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kawasaki,  Kohei
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kondo,  Iona
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Koshimoto,  Naoki
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Li,  Man Cheung Alex
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Matsubara,  Yutaka
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Muraki,  Yasushi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Miyazaki,  Shota
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nagakane,  Masayuki
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ranc,  Clément
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rattenbury,  Nicholas J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Suematsu,  Haruno
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sullivan,  Denis J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sumi,  Takahiro
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Suzuki,  Daisuke
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tristram,  Paul J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yonehara,  Atsunori
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collaboration,  The MOA
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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Citation

Han, C., Yee, J. C., Udalski, A., Bond, I. A., Bozza, V., Cassan, A., et al. (2019). Spectroscopic Mass and Host-star Metallicity Measurements for Newly Discovered Microlensing Planet OGLE-2018-BLG-0740Lb. The Astronomical Journal, 158.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D379-5
Abstract
We report the discovery of the microlensing planet OGLE-2018-BLG-0740Lb. The planet is detected with a very strong signal of ∆χ 2 ∼ 4630, but the interpretation of the signal suffers from two types of degeneracies. One type is caused by the previously known close/wide degeneracy, and the other is caused by an ambiguity between two solutions, in which one solution requires the incorporation of finite- source effects, while the other solution is consistent with a point- source interpretation. Although difficult to be firmly resolved based on only the photometric data, the degeneracy is resolved in strong favor of the point-source solution with the additional external information obtained from astrometric and spectroscopic observations. The small astrometric offset between the source and baseline object supports that the blend is the lens and this interpretation is further secured by the consistency of the spectroscopic distance estimate of the blend with the lensing parameters of the point-source solution. The estimated mass of the host is 1.0 ± 0.1 M ☉ and the mass of the planet is 4.5 ± 0.6 M J (close solution) or 4.8 ± 0.6 M J (wide solution) and the lens is located at a distance of 3.2 ± 0.5 kpc. The bright nature of the lens, with I ∼ 17.1 (V ∼ 18.2), combined with its dominance of the observed flux suggest that radial-velocity (RV) follow- up observations of the lens can be done using high-resolution spectrometers mounted on large telescopes, e.g., Very Large Telescope/ESPRESSO, and this can potentially not only measure the period and eccentricity of the planet but also probe for close-in planets. We estimate that the expected RV amplitude would be ∼ 60\sin i {{m}} {{{s}}}-1.