Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astronomical Journal Year : 2019

Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf

Youn Kil Jung
  • Function : Author
Andrew Gould
Andrzej Udalski
  • Function : Author
Takahiro Sumi
Jennifer C. Yee
  • Function : Author
Yossi Shvartzvald
  • Function : Author
Weicheng Zang
  • Function : Author
Cheongho Han
  • Function : Author
Michael D. Albrow
  • Function : Author
Sun-Ju Chung
  • Function : Author
Kyu-Ha Hwang
  • Function : Author
Yoon-Hyun Ryu
  • Function : Author
In-Gu Shin
  • Function : Author
Wei Zhu
  • Function : Author
Sang-Mok Cha
  • Function : Author
Dong-Jin Kim
  • Function : Author
Hyoun-Woo Kim
  • Function : Author
Seung-Lee Kim
  • Function : Author
Chung-Uk Lee
  • Function : Author
Dong-Joo Lee
  • Function : Author
Yongseok Lee
  • Function : Author
Byeong-Gon Park
  • Function : Author
Richard W. Pogge
  • Function : Author
Przemek Mróz
  • Function : Author
Michał K. Szymański
  • Function : Author
Jan Skowron
Radek Poleski
  • Function : Author
Igor Soszyński
  • Function : Author
Paweł Pietrukowicz
  • Function : Author
Szymon Kozłowski
  • Function : Author
Krzystof Ulaczyk
  • Function : Author
Krzysztof A. Rybicki
  • Function : Author
Patryk Iwanek
  • Function : Author
Marcin Wrona
  • Function : Author
Charles A. Beichman
  • Function : Author
Geoffery Bryden
  • Function : Author
Sebastiano Calchi Novati
  • Function : Author
Sean Carey
B. Scott Gaudi
Calen B. Henderson
  • Function : Author
Fumio Abe
  • Function : Author
Richard Barry
  • Function : Author
David P. Bennett
  • Function : Author
Ian A. Bond
  • Function : Author
Aparna Bhattacharya
  • Function : Author
Martin Donachie
  • Function : Author
Akihiko Fukui
Yuki Hirao
  • Function : Author
Yoshitaka Itow
Iona Kondo
Naoki Koshimoto
Man Cheung Alex Li
  • Function : Author
Yutaka Matsubara
  • Function : Author
Shota Miyazaki
Yasushi Muraki
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
Daisuke Suzuki
Paul J. Tristram
  • Function : Author
Atsunori Yonehara
  • Function : Author
Savannah Jacklin
  • Function : Author
Matthew T. Penny
  • Function : Author
Keivan G. Stassun
  • Function : Author
Shude Mao
  • Function : Author
Tianshu Wang
  • Function : Author

Abstract

We report the discovery of a Spitzer microlensing planet OGLE-2018-BLG-0596Lb, with preferred planet-host mass ratio q ∼ 2 × 10-4. The planetary signal, which is characterized by a short (∼1 day) “bump” on the rising side of the lensing light curve, was densely covered by ground-based surveys. We find that the signal can be explained by a bright source that fully envelops the planetary caustic, i.e., a “Hollywood” geometry. Combined with the source proper motion measured from Gaia, the Spitzer satellite parallax measurement makes it possible to precisely constrain the lens physical parameters. The preferred solution, in which the planet perturbs the minor image due to lensing by the host, yields a Uranus-mass planet with a mass of M p = 13.9 ± 1.6 M orbiting a mid M-dwarf with a mass of M h = 0.23 ± 0.03 M . There is also a second possible solution that is substantially disfavored but cannot be ruled out, for which the planet perturbs the major image. The latter solution yields M p = 1.2 ± 0.2 M and M h = 0.15 ± 0.02 M . By combining the microlensing and Gaia data together with a Galactic model, we find in either case that the lens lies on the near side of the Galactic bulge at a distance D L ∼ 6 ± 1 kpc. Future adaptive optics observations may decisively resolve the major image/minor image degeneracy.

Dates and versions

insu-03674432 , version 1 (20-05-2022)

Identifiers

Cite

Youn Kil Jung, Andrew Gould, Andrzej Udalski, Takahiro Sumi, Jennifer C. Yee, et al.. Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf. The Astronomical Journal, 2019, 158, ⟨10.3847/1538-3881/ab237f⟩. ⟨insu-03674432⟩
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