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Microlensing statistics – snowline planet frequency

Microlensing Planetary and Binary Statistics from 2011-2013 Generation-II OGLE-MOA-Wise Yossi Shvartzvald Tel-Aviv University with Dan Maoz , Matan Friedmann (TAU) in collaboration with OGLE, MOA, µFUN . Microlensing statistics – snowline planet frequency.

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Microlensing statistics – snowline planet frequency

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  1. Microlensing Planetary and Binary Statistics from 2011-2013 Generation-II OGLE-MOA-WiseYossiShvartzvaldTel-Aviv University with Dan Maoz, MatanFriedmann (TAU) in collaboration with OGLE, MOA, µFUN

  2. Microlensing statistics – snowline planet frequency Gould et al. 2010 (6 planets): ~1/3 of stars have snowline-region giant planets ~1/6 of stars have solar-like planetary systems Sumi et al. 2010 (10 planets): Neptunes are at least 3 times more common than Jupiters Cassan et al. 2012 (3 planets+Gould10+Sumi10): ~1/6 host Jupiters ~1/2 host Neptunes ~2/3 host super-Earths

  3. Second generation survey • A different approach: • Controlled experiment: • Untargeted survey, specific field (high mag + low mag) • Continuous coverage • Forward modeling for planet abundance: • Simulate the experiment • Define planetary anomaly detection threshold (not necessarily perfectly modeled events) • Compare data to simulation

  4. The generation-II network Wise Obs., Israel, 1m OGLE, Chile, 1.3m MOA, NZ, 1.8m

  5. The generation-II network

  6. Second generation microlensing survey • 8 deg2 of bulge with highest lensing rate • covered quasi-continuously by all 3 telescopes • cadences 20-40 min

  7. Simulating the experiment What to expect from Generation II? a simulation: Monte-Carlo of many Solar-System-like planetary systems, host star properties matching those of bulge microlensing population, random inclinations. Shvartzvald & Maoz 2012

  8. Simulating the experiment …add real sampling sequences, photometry errors… Ray trace through systems…… …search for planetary-type anomalies with same detection criteria as real data

  9. Simulating the experiment Simulation results: can detect ~15-20% of planets around microlensed stars; Shvartzvald & Maoz 2012

  10. 2011-2013 sample • Sample Criteria: • u0<=1 • t0 within Wise season • Data from all 3 groups

  11. 2011-2013 sample • Sample Criteria: • u0<=1 • t0 within Wise season • Data from all 3 groups

  12. Comparison to simulation -u0 2011-2013 sample Simulation Shvartzvald & Maoz 2012

  13. Comparison to simulation -tE 2011-2013 sample Simulation Shvartzvald & Maoz 2012

  14. tE distribution 2011-2013 sample MOA-II 2006-2007 Sumi et al. 2011

  15. Anomalous events Mass ratio

  16. Anomalous events Mass ratio Accounting for detection efficiency, >17% planetary system frequency

  17. Gen-II planets From the 16thmicrolensing conference in Pasadena ???

  18. Gen-II planets • MOA-11-322 Shvartzvaldet al. 2014

  19. Gen-II planets • MOA-11-322 Super-Jupiter around M dwarf Shvartzvaldet al. 2014

  20. Gen-II planets I-band (mag) OGLE MOA Wise • MOA-11-322 • MOA-11-293 Survey data only: All data: I-band (mag) Yee et al. 2012 HJD-2450000

  21. Gen-II planets I-band (mag) OGLE MOA Wise • MOA-11-322 • MOA-11-293 Survey data only: All data: First ML planet in the habitable zone I-band (mag) Batista et al. 2013 Yee et al. 2012 HJD-2450000

  22. Gen-II planets • MOA-11-322 • MOA-11-293 • OGLE-11-265 Saturn around M dwarf modeled by C. Han

  23. Gen-II planets • MOA-11-322 • MOA-11-293 • OGLE-11-265 • OGLE-12-406 Super-Jupiter around M dwarf Poleski et al. 2013, Tsapras et al. 2013

  24. Gen-II planets • MOA-11-322 • MOA-11-293 • OGLE-11-265 • OGLE-12-406 Super-Jupiters around low-mass stars are common? Super-Jupiter around M dwarf Poleski et al. 2013, Tsapras et al. 2013

  25. Future Work

  26. Galactic model from higher order statistics

  27. C28 telescope • A new telescope at Wise observatory: • 0.71m telescope • Fully robotic • FOV: 1 degree2 • Together with 1m telescope, • higher cadence / more fields

  28. Conclusions • 2nd generation microlening survey: • Preliminary results suggest a lower limit of 17% planetary systems frequency • Super-Jupiters around low-mass stars are common (?) • Multiplicity fraction and binary mass ratio distributions

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