English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report the discovery of a planet in the microlensing eventOGLE-2018-BLG-1269, with planet-host mass ratio $q \sim 6\times10^{-4}$, i.e.,$0.6$ times smaller than the Jupiter/Sun mass ratio. Combined with the $Gaia$parallax and proper motion, a strong one-dimensional constraint on themicrolens parallax vector allows us to significantly reduce the uncertaintiesof lens physical parameters. A Bayesian analysis that ignores any informationabout light from the host yields that the planet is a cold giant $(M_{2} =0.69_{-0.22}^{+0.44}\,M_{\rm J})$ orbiting a Sun-like star $(M_{1} =1.13_{-0.35}^{+0.72}\,M_{\odot})$ at a distance of $D_{\rm L} =2.56_{-0.62}^{+0.92}\,{\rm kpc}$. The projected planet-host separation is$a_{\perp} = 4.61_{-1.17}^{+1.70}\,{\rm au}$. Using {\it Gaia} astrometry, weshow that the blended light lies $\lesssim 12\,$mas from the host and thereforemust be either the host star or a stellar companion to the host. An isochroneanalysis favors the former possibility at $>99.6\%$. The host is therefore asubgiant. For host metallicities in the range of $0.0 \leq {\rm [Fe/H]} \leq+0.3$, the host and planet masses are then in the range of $1.16 \leqM_{1}/M_{\odot} \leq 1.38$ and $0.74 \leq M_{2}/M_{\rm J} \leq 0.89$,respectively. Low host metallicities are excluded. The brightness and proximityof the lens make the event a strong candidate for spectroscopic followup bothto test the microlensing solution and to further characterize the system.

OGLE-2018-BLG-1269Lb: A Jovian Planet With A Bright, $I=16$ Host