摘要
Aims: We report the discovery of a planet with a high
planet-to-star mass ratio in the microlensing event MOA-2009-BLG-387,
which exhibited pronounced deviations over a 12-day interval, one of the
longest for any planetary event. The host is an M dwarf, with a mass in
the range 0.07 M&sun; <Mhost <0.49
M&sun; at 90% confidence. The planet-star mass ratio q =
0.0132 ± 0.003 has been measured extremely well, so at the
best-estimated host mass, the planet mass is mp = 2.6 Jupiter
masses for the median host mass, M = 0.19 M&sun;.
Methods: The host mass is determined from two "higher order"
microlensing parameters. One of these, the angular Einstein radius
¿E = 0.31 ± 0.03 mas has been accurately
measured, but the other (the microlens parallax ¿E, which
is due to the Earth's orbital motion) is highly degenerate with the
orbital motion of the planet. We statistically resolve the degeneracy
between Earth and planet orbital effects by imposing priors from a
Galactic model that specifies the positions and velocities of lenses and
sources and a Kepler model of orbits. Results: The 90% confidence
intervals for the distance, semi-major axis, and period of the planet
are 3.5 kpc <DL <7.9 kpc, 1.1 AU <a <2.7 AU,
and 3.8 yr <P <7.6 yr, respectively.
Photometric data is only available in electronic form at the CDS via
anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/529/A102
| 源语言 | English |
|---|---|
| 页(从-至) | 102 |
| 期刊 | Astronomy & Astrophysics |
| 卷 | 529 |
| 出版状态 | Published - 1 5月 2011 |
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