Spectroscopic Mass and Host-star Metallicity Measurements for Newly Discovered Microlensing Planet OGLE-2018-BLG-0740Lb - Archive ouverte HAL Access content directly
Journal Articles The Astronomical Journal Year : 2019

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

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Cheongho Han
  • Function : Author
Jennifer C. Yee
  • Function : Author
Andrzej Udalski
  • Function : Author
Ian A. Bond
  • Function : Author
Valerio Bozza
  • Function : Author
Yuki Hirao
  • Function : Author
Subo Dong
  • Function : Author
Juna A. Kollmeier
  • Function : Author
Nidia Morrell
  • Function : Author
Konstantina Boutsia
  • Function : Author
Michael D. Albrow
  • Function : Author
Sun-Ju Chung
  • Function : Author
Andrew Gould
  • Function : Author
Kyu-Ha Hwang
  • Function : Author
Chung-Uk Lee
  • Function : Author
Yoon-Hyun Ryu
  • Function : Author
In-Gu Shin
  • Function : Author
Yossi Shvartzvald
  • Function : Author
Youn Kil Jung
  • Function : Author
Doeon Kim
  • Function : Author
Woong-Tae Kim
  • Function : Author
Sang-Mok Cha
  • Function : Author
Dong-Jin Kim
  • Function : Author
Hyoun-Woo Kim
  • Function : Author
Kyeongsoo Hong
  • Function : Author
Seung-Lee Kim
  • Function : Author
Dong-Joo Lee
  • Function : Author
Yongseok Lee
  • Function : Author
Byeong-Gon Park
  • Function : Author
Richard W. Pogge
  • Function : Author
Weicheng Zang
  • Function : Author
Przemek Mróz
  • Function : Author
Michał K. Szymański
  • Function : Author
Jan Skowron
  • Function : Author
Radek Poleski
  • Function : Author
Igor Soszyński
  • Function : Author
Paweł Pietrukowicz
  • Function : Author
Szymon Kozłowski
  • Function : Author
Krzysztof Ulaczyk
  • Function : Author
Krzysztof A. Rybicki
  • Function : Author
Patryk Iwanek
  • Function : Author
Marcin Wrona
  • Function : Author
Fumio Abe
  • Function : Author
Richard Barry
  • Function : Author
David P. Bennett
  • Function : Author
Aparna Bhattacharya
  • Function : Author
Martin Donachie
  • Function : Author
Akihiko Fukui
  • Function : Author
Yoshitaka Itow
  • Function : Author
Kohei Kawasaki
  • Function : Author
Iona Kondo
  • Function : Author
Naoki Koshimoto
  • Function : Author
Man Cheung Alex Li
  • Function : Author
Yutaka Matsubara
  • Function : Author
Yasushi Muraki
  • Function : Author
Shota Miyazaki
  • Function : Author
Masayuki Nagakane
  • Function : Author
Clément Ranc
  • Function : Author
  • PersonId : 1181264
  • IdHAL : cr
Nicholas J. Rattenbury
  • Function : Author
Haruno Suematsu
  • Function : Author
Denis J. Sullivan
  • Function : Author
Takahiro Sumi
  • Function : Author
Daisuke Suzuki
  • Function : Author
Paul J. Tristram
  • Function : Author
Atsunori Yonehara
  • Function : Author

Abstract

We report the discovery of the microlensing planet OGLE-2018-BLG-0740Lb. The planet is detected with a very strong signal of Δχ 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.

Dates and versions

insu-03747923 , version 1 (09-08-2022)

Identifiers

Cite

Cheongho Han, Jennifer C. Yee, Andrzej Udalski, Ian A. Bond, Valerio Bozza, et al.. Spectroscopic Mass and Host-star Metallicity Measurements for Newly Discovered Microlensing Planet OGLE-2018-BLG-0740Lb. The Astronomical Journal, 2019, 158, ⟨10.3847/1538-3881/ab2df4⟩. ⟨insu-03747923⟩
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