Projects per year
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 MP = 0.9 ± 0.3 MJ, and the planet is orbiting a star with a mass M = 0.22 ± 0.06 MΘ. The second possible configuration (2σ away) consists of a planet with MP = 0.6 ± 0.3 MJ and host star with M = 0.14 ± 0.06 MΘ. 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.
Original language | English |
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Journal | Astrophysical Journal |
Volume | 804 |
Issue number | 1 |
Early online date | 27 Apr 2015 |
DOIs | |
Publication status | Published - 1 May 2015 |
Keywords
- Gravitational lensing: micro
- Planetary systems
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Dive into the research topics of 'OGLE-2011-BLG-0265Lb: a Jovian microlensing planet orbiting an M dwarf'. Together they form a unique fingerprint.Projects
- 4 Finished
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Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018
Jardine, M. M. (PI), Cameron, A. C. (CoI), Cyganowski, C. J. (CoI), Horne, K. D. (CoI) & Wood, K. (CoI)
Science & Technology Facilities Council
1/04/15 → 31/03/18
Project: Standard
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AGN Echo mapping: AGN Echo Mapping and Mineral Clouds in Alien Atmospheres
Horne, K. D. (PI)
Science & Technology Facilities Council
1/04/12 → 31/08/12
Project: Standard
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Planet population statistics: Planet population statistics from fully-deterministic microlensing campaigns
Dominik, M. (PI)
1/10/11 → 30/09/15
Project: Fellowship