A Wide Orbit Exoplanet OGLE-2012-BLG-0838Lb

R. Poleski , B. S. Gaudi (1) , Xiaojia Xie , A. Udalski , J. C. Yee , J. Skowron , M. K. Szymański , I. Soszyński , P. Pietrukowicz , S. Kozłowski , Ł. Wyrzykowski , K. Ulaczyk , C. Han , Subo Dong , K. M. Morzinski , J. R. Males , L. M. Close , A. Gould (1) , R. W. Pogge (1) , J.-P. Beaulieu (2) , J.-B. Marquette (3)

1 Ohio State University - Department of Astronomy
2 IAP - Institut d'Astrophysique de Paris
3 M2A 2019

We present the discovery of a planet on a very wide orbit in the microlensing event OGLE-2012-BLG-0838. The signal of the planet is well separated from the main peak of the event and the planet-star projected separation is found to be twice larger than the Einstein ring radius, which roughly corresponds to a projected separation of ~4 AU. Similar planets around low-mass stars are very hard to find using any technique other than microlensing. We discuss microlensing model fitting in detail and discuss the prospects for measuring the mass and distance of lens system directly.

Mots clés: Astrophysics - Earth and Planetary Astrophysics

Domaines: Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]

R. Poleski, B. S. Gaudi, Xiaojia Xie, A. Udalski, J. C. Yee, et al.. A Wide Orbit Exoplanet OGLE-2012-BLG-0838Lb. The Astronomical Journal, 2019, ⟨10.3847/1538-3881/ab8a49⟩. ⟨hal-01993586⟩