OGLE-2011-BLG-0265Lb: A Jovian Microlensing Planet Orbiting an M Dwarf

Skowron, J and Shin, I-G and Udalski, A and Han, C and Sumi, T and Shvartzvald, Y and Gould, A and Prester, DD and Street, RA and Jorgensen, UG and Bennett, DP and Bozza, V and Szymanski, MK and Kubiak, M and Pietrzynski, G and Soszynski, I and Poleski, R and Kozlowski, S and Pietrukowicz, P and Ulaczyk, K and Wyrzykowski, L and Abe, F and Bhattacharya, A and Bond, IA and Botzler, CS and Freeman, M and Fukui, A and Fukunaga, D and Itow, Y and Ling, CH and Koshimoto, N and Masuda, K and Matsubara, Y and Muraki, Y and Namba, S and Ohnishi, K and Philpott, LC and Rattenbury, N and Saito, T and Sullivan, DJ and Suzuki, D and Tristram, PJ and Yock, PCM and Maoz, D and Kaspi, S and Friedmann, M and Almeida, LA and Batista, V and Christie, G and Choi, J-Y and Depoy, DL and Gaudi, BS and Henderson, C and Hwang, K-H and Jablonski, F and Jung, YK and Lee, C-U and McCormick, J and Natusch, T and Ngan, H and Park, H and Pogge, RW and Yee, JC and Albrow, MD and Bachelet, E and Beaulieu, J-P and Brillant, S and Caldwell, JAR and Cassan, A and Cole, A and Corrales, E and Coutures, CH and Dieters, S and Donatowicz, J and Fouque, P and Greenhill, J and Kains, N and Kane, SR and Kubas, D and Marquette, J-B and Martin, R and Menzies, J and Pollard, KR and Ranc, C and Sahu, KC and Wambsganss, J and Williams, A and Wouters, D and Tsapras, Y and Bramich, DM and Horne, K and Hundertmark, M and Snodgrass, C and Steele, IA and Alsubai, KA and Browne, P and Burgdorf, MJ and Novati, SC and Dodds, P and Dominik, M and Dreizler, S and Fang, X-S and Gu, C-H and Hardis, K and Harpsoe, K and Hessman, FV and Hinse, TC and Hornstrup, A and Jessen-Hansen, J and Kerins, E and Liebig, C and Lund, M and Lundkvist, M and Mancini, L and Mathiasen, M and Penny, MT and Rahvar, S and Ricci, D and Scarpetta, G and Skottfelt, J and Southworth, J and Surdej, J and Tregloan-Reed, J and Wertz, O (2015) OGLE-2011-BLG-0265Lb: A Jovian Microlensing Planet Orbiting an M Dwarf. Astrophysical Journal, 804 (1). ISSN 0004-637X

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Abstract

We report the discovery of a Jupiter-mass planet orbiting an M-dwarf star that gave rise to the microlensing event OGLE-2011-BLG-0265. Such a system is very rare among known planetary systems and thus the discovery is important for theoretical studies of planetary formation and evolution. High-cadence temporal coverage of the planetary signal, combined with extended observations throughout the event, allows us to accurately model the observed light curve. However, the final microlensing solution remains degenerate, yielding two possible configurations of the planet and the host star. In the case of the preferred solution, the mass of the planet is ${{M}_{{\rm p}}}=0.9\pm 0.3\ {{M}_{{\rm J}}}$, and the planet is orbiting a star with a mass $M=0.22\pm 0.06\ {{M}_{\odot }}$. The second possible configuration (2σ away) consists of a planet with ${{M}_{{\rm p}}}=0.6\pm 0.3\ {{M}_{{\rm J}}}$ and host star with $M=0.14\pm 0.06\ {{M}_{\odot }}$. The system is located in the Galactic disk 3–4 kpc toward the Galactic bulge. In both cases, with an orbit size of 1.5–2.0 AU, the planet is a "cold Jupiter"—located well beyond the "snow line" of the host star. Currently available data make the secure selection of the correct solution difficult, but there are prospects for lifting the degeneracy with additional follow-up observations in the future, when the lens and source star separate.

Item Type: Article 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural) Q Science > QB AstronomyQ Science > QC Physics Astrophysics Research Institute American Astronomical Society; IOP Publishing Author 09 May 2017 09:15 09 May 2017 09:15 10.1088/0004-637X/804/1/33 http://researchonline.ljmu.ac.uk/id/eprint/6387