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OGLE-2018-BLG-1185b: A Low-mass Microlensing Planet Orbiting a Low-mass Dwarf

Kondo, Iona; Yee, Jennifer C.; Bennett, David P.; Sumi, Takahiro; Koshimoto, Naoki; Bond, Ian A.; Gould, Andrew; Udalski, Andrzej; Shvartzvald, Yossi; Kil Jung, Youn; Zang, Weicheng; Bozza, Valerio; Bachelet, Etienne; Hundertmark, Markus P.G.; Rattenbury, Nicholas J.; Abe, F.; Barry, R.; Bhattacharya, A.; Donachie, M.; Fukui, A.; Fujii, H.; Hirao, Y.; Ishitani Silva, S.; Itow, Y.; Kirikawa, R.; Li, M.C.A.; Matsubara, Y.; Miyazaki, S.; Muraki, Y.; Olmschenk, G.; Ranc, C.; Satoh, Y.; Shoji, H.; Suzuki, D.; Tanaka, Y.; Tristram, P.J.; Yamawaki, T.; Yonehara, A.; Mróz, P.; Poleski, R.; Skowron, J.; Szymański, M.K.; Soszyński, I.; Kozłowski, S.; Ulaczyk, P.Pietrukowicz K.; Rybicki, K.A.; Iwanek, P.; Wrona, M.; Albrow, M.D.; -J. Chung, S.; Han, C.; -H. Hwang, K.; -W. Kim, H.; -G. Shin, I.; -M. Cha, S.; -J. Kim, D.; -L. Kim, S.; -U. Lee, C.; -J. Lee, D.; Lee, Y.; -G. Park, B.; Pogge, R.W.; -H. Ryu, Y.; Beichman, C.A.; Bryden, G.; Calchi Novati, S.; Carey, S.; Gaudi, B.S.; Henderson, C.B.; Zhu...

OGLE-2018-BLG-1185b: A Low-mass Microlensing Planet Orbiting a Low-mass Dwarf Thumbnail


Authors

Iona Kondo

Jennifer C. Yee

David P. Bennett

Takahiro Sumi

Naoki Koshimoto

Ian A. Bond

Andrew Gould

Andrzej Udalski

Yossi Shvartzvald

Youn Kil Jung

Weicheng Zang

Valerio Bozza

Etienne Bachelet

Markus P.G. Hundertmark

Nicholas J. Rattenbury

F. Abe

R. Barry

A. Bhattacharya

M. Donachie

A. Fukui

H. Fujii

Y. Hirao

S. Ishitani Silva

Y. Itow

R. Kirikawa

M.C.A. Li

Y. Matsubara

S. Miyazaki

Y. Muraki

G. Olmschenk

C. Ranc

Y. Satoh

H. Shoji

D. Suzuki

Y. Tanaka

P.J. Tristram

T. Yamawaki

A. Yonehara

P. Mróz

R. Poleski

J. Skowron

M.K. Szymański

I. Soszyński

S. Kozłowski

P.Pietrukowicz K. Ulaczyk

K.A. Rybicki

P. Iwanek

M. Wrona

M.D. Albrow

S. -J. Chung

C. Han

K. -H. Hwang

H. -W. Kim

I. -G. Shin

S. -M. Cha

D. -J. Kim

S. -L. Kim

C. -U. Lee

D. -J. Lee

Y. Lee

B. -G. Park

R.W. Pogge

Y. -H. Ryu

C.A. Beichman

G. Bryden

S. Calchi Novati

S. Carey

B.S. Gaudi

C.B. Henderson

W. Zhu

D. Maoz

M.T. Penny

M. Dominik

U.G. Jørgensen

P. Longa-Pe{\~{ n}}a

N. Peixinho

S. Sajadian

J. Skottfelt

C. Snodgrass

J. Tregloan-Reed

M.J. Burgdorf

J. Campbell-White

S. Dib

Y.I. Fujii

T.C. Hinse

E. Khalouei

S. Rahvar

M. Rabus

Y. Tsapras

R.A. Street

D.M. Bramich

A. Cassan

K. Horne

J. Wambsganss

S. Mao

A. Saha



Abstract

We report an analysis of the planetary microlensing event OGLE-2018-BLG-1185, which was observed by a large number of ground-based telescopes and by the Spitzer Space Telescope. The ground-based light curve indicates a low planet–host star mass ratio of q = (6.9 ± 0.2) × 10-5, which is near the peak of the wide-orbit exoplanet mass-ratio distribution. We estimate the host star and planet masses with a Bayesian analysis using the measured angular Einstein radius under the assumption that stars of all masses have an equal probability of hosting the planet. The flux variation observed by Spitzer is marginal, but still places a constraint on the microlens parallax. Imposing a conservative constraint that this flux variation should be ?fSpz < 4 instrumental flux units yields a host mass of ${M}_{\mathrm{host}}={0.37}_{-0.21}^{+0.35}\ {M}_{\odot }$ and a planet mass of ${m}_{{\rm{p}}}={8.4}_{-4.7}^{+7.9}\ {M}_{\oplus }$. A Bayesian analysis including the full parallax constraint from Spitzer suggests smaller host star and planet masses of ${M}_{\mathrm{host}}={0.091}_{-0.018}^{+0.064}\ {M}_{\odot }$ and ${m}_{{\rm{p}}}={2.1}_{-0.4}^{+1.5}\ {M}_{\oplus }$, respectively. Future high-resolution imaging observations with the Hubble Space Telescope or Extremely Large Telescope could distinguish between these two scenarios and help reveal the planetary system properties in more detail.

Journal Article Type Article
Acceptance Date May 11, 2021
Publication Date Jul 29, 2021
Journal Astronomical Journal
Print ISSN 0004-6256
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 162
Issue 2
Article Number 77
DOI https://doi.org/10.3847/1538-3881/ac00ba
Publisher URL https://iopscience.iop.org/article/10.3847/1538-3881/ac00ba

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