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

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 the Einstein ring radius, which corresponds to a projected...

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Veröffentlicht in:The Astronomical journal 2020-06, Vol.159 (6), p.261
Hauptverfasser: Poleski, R., Suzuki, Daisuke, Udalski, A., Xie, Xiaojia, Yee, J. C., Koshimoto, Naoki, Gaudi, B. S., Gould, A., Skowron, J., Szyma ski, M. K., Soszy ski, I., Pietrukowicz, P., Koz owski, S., Wyrzykowski, ., Ulaczyk, K., Abe, Fumio, Barry, Richard K., Bennett, David. P., Bhattacharya, Aparna, Bond, Ian A., Donachie, Martin, Fujii, Hirosane, Fukui, Akihiko, Itow, Yoshitaka, Hirao, Yuki, Kamei, Yuhei, Kondo, Iona, Alex Li, Man Cheung, Matsubara, Yutaka, Miyazaki, Shota, Muraki, Yasushi, Nagakane, Masayuki, Ranc, Clément, Rattenbury, Nicholas J., Satoh, Yuki K., Shoji, Hikaru, Suematsu, Haruno, Sullivan, Denis J., Sumi, Takahiro, Tristram, Paul J., Yamakawa, Takeharu, Yamawaki, Tsubasa, Yonehara, Atsunori, Han, C., Dong, Subo, Morzinski, K. M., Males, J. R., Close, L. M., Pogge, R. W., Beaulieu, J.-P., Marquette, J.-B.
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Sprache:eng
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Zusammenfassung: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 the Einstein ring radius, which 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 the lens system directly.
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ab8a49