OGLE-2012-BLG-0950Lb: The First Planet Mass Measurement from Only Microlens Parallax and Lens Flux - Archive ouverte HAL Access content directly
Journal Articles The Astronomical Journal Year : 2017

OGLE-2012-BLG-0950Lb: The First Planet Mass Measurement from Only Microlens Parallax and Lens Flux

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N. Koshimoto
  • Function : Author
A. Udalski
  • Function : Author
T. Sumi
  • Function : Author
D. P. Bennett
  • Function : Author
I. A. Bond
  • Function : Author
N. Rattenbury
  • Function : Author
A. Fukui
  • Function : Author
S. Brillant
  • Function : Author
F. Abe
  • Function : Author
Y. Asakura
  • Function : Author
A. Bhattacharya
  • Function : Author
M. Donachie
  • Function : Author
M. Freeman
  • Function : Author
Y. Hirao
  • Function : Author
Y. Itow
  • Function : Author
M. C. A. Li
  • Function : Author
C. H. Ling
  • Function : Author
K. Masuda
  • Function : Author
Y. Matsubara
  • Function : Author
T. Matsuo
  • Function : Author
Y. Muraki
  • Function : Author
M. Nagakane
  • Function : Author
K. Ohnishi
  • Function : Author
H. Oyokawa
  • Function : Author
To. Saito
  • Function : Author
A. Sharan
  • Function : Author
H. Shibai
  • Function : Author
D. J. Sullivan
  • Function : Author
D. Suzuki
  • Function : Author
P. J. Tristram
  • Function : Author
A. Yonehara
  • Function : Author
S. Kozłowski
  • Function : Author
P. Pietrukowicz
  • Function : Author
R. Poleski
  • Function : Author
J. Skowron
  • Function : Author
I. Soszyński
  • Function : Author
M. K. Szymański
  • Function : Author
K. Ulaczyk
  • Function : Author
Ł. Wyrzykowski
  • Function : Author

Abstract

We report the discovery of a microlensing planet OGLE-2012-BLG-0950Lb with a planet/host mass ratio of q≃ 2× {10}-4. A long term distortion detected in both MOA and OGLE light curve can be explained by the microlens parallax due to the Earth’s orbital motion around the Sun. Although the finite source effect is not detected, we obtain the lens flux by the high resolution Keck AO observation. Combining the microlens parallax and the lens flux reveal the nature of the lens: a planet with mass of {M}{{p}}={35}-9+17{M}\oplus is orbiting around an M-dwarf with mass of {M}{host}={0.56}-0.16+0.12{M} with a planet-host projected separation of {r}\perp ={2.7}-0.7+0.6 au located at {D}{{L}}={3.0}-1.1+0.8 kpc from us. This is the first mass measurement from only microlens parallax and the lens flux without the finite source effect. In the coming space observation-era with Spitzer, K2, Euclid, and WFIRST, we expect many such events for which we will not be able to measure any finite source effect. This work demonstrates an ability of mass measurements in such events.

Dates and versions

insu-03747487 , version 1 (08-08-2022)

Identifiers

Cite

N. Koshimoto, A. Udalski, J. P. Beaulieu, T. Sumi, D. P. Bennett, et al.. OGLE-2012-BLG-0950Lb: The First Planet Mass Measurement from Only Microlens Parallax and Lens Flux. The Astronomical Journal, 2017, 153, ⟨10.3847/1538-3881/153/1/1⟩. ⟨insu-03747487⟩
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