0000000001267166

AUTHOR

S. Kobara

showing 2 related works from this author

MOA-2011-BLG-293Lb: A test of pure survey microlensing planet detections

2012

Because of the development of large-format, wide-field cameras, microlensing surveys are now able to monitor millions of stars with sufficient cadence to detect planets. These new discoveries will span the full range of significance levels including planetary signals too small to be distinguished from the noise. At present, we do not understand where the threshold is for detecting planets. MOA-2011-BLG-293Lb is the first planet to be published from the new surveys, and it also has substantial followup observations. This planet is robustly detected in survey+followup data (Delta chi^2 ~ 5400). The planet/host mass ratio is q=5.3+/- 0.2*10^{-3}. The best fit projected separation is s=0.548+/-…

PhysicsEarth and Planetary Astrophysics (astro-ph.EP)010308 nuclear & particles physicsAstronomyFOS: Physical sciencesAstronomy and AstrophysicsGravitational microlensing01 natural sciencesTest (assessment)Graduate researchStarsSpace and Planetary SciencePlanet0103 physical sciences010303 astronomy & astrophysicsAstrophysics - Earth and Planetary Astrophysics
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Characterizing Lenses and Lensed Stars of High-magnification Single-lens Gravitational Microlensing Events with Lenses Passing over Source Stars

2012

We present the analysis of the light curves of 9 high-magnification single-lens gravitational microlensing events with lenses passing over source stars, including OGLE-2004-BLG-254, MOA-2007-BLG-176, MOA-2007-BLG-233/OGLE-2007-BLG-302, MOA-2009-BLG-174, MOA-2010-BLG-436, MOA-2011-BLG-093, MOA-2011-BLG-274, OGLE-2011-BLG-0990/MOA-2011-BLG-300, and OGLE-2011-BLG-1101/MOA-2011-BLG-325. For all events, we measure the linear limb-darkening coefficients of the surface brightness profile of source stars by measuring the deviation of the light curves near the peak affected by the finite-source effect. For 7 events, we measure the Einstein radii and the lens-source relative proper motions. Among the…

Physics010308 nuclear & particles physicsBrown dwarfFOS: Physical sciencesAstronomy and Astrophysicsgravitational lensing: microAstrophysicsMass ratioLight curveGravitational microlensing01 natural sciencesGalaxy: bulgeGalaxy: bulge gravitational lensing: microEinstein radiuslaw.inventionLens (optics)StarsAstrophysics - Solar and Stellar AstrophysicsSettore FIS/05 - Astronomia e AstrofisicaSpace and Planetary Sciencelaw0103 physical sciencesSurface brightness010303 astronomy & astrophysicsSolar and Stellar Astrophysics (astro-ph.SR)
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