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Properties of binary systems found in the CoRoT exoplanet search

Properties of binary systems found in the CoRoT exoplanet search. J.M. Almenara, H. Deeg, CoRoT Detection WG, CoRoT Ground-Based Follow-Up WG, Planets in binaries WG. Outline. Overview of systems found in the exoplanet search Results from Follow-Up observations

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Properties of binary systems found in the CoRoT exoplanet search

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  1. Properties of binary systems found in the CoRoT exoplanet search J.M. Almenara, H. Deeg, CoRoT Detection WG, CoRoT Ground-Based Follow-Up WG, Planets in binaries WG

  2. Outline • Overview of systems found in the exoplanet search • Results from Follow-Up observations • Some special cases of binary configurations found in the planet detection effort

  3. Sample • All detections from IRa01, LRc01 and LRa01 • 12 < R [mag] < 16 • 0.24 < P [days] < 106.4 • 0.018 < DF/F [%] < 81.64 • Run durations: • IRa01 55 days • LRc01 142 days • LRa01 131 days * IRa01 and LRa01 have 1402 targets and 30 detections in common

  4. Magnitude distribution(cumulative, normalized to 1)

  5. Magnitude

  6. Period distribution log N  -2/3 log P 60 days

  7. Eclipse depth

  8. Eclipse depth

  9. Comparison of predicted ‘alarms’ of all kinds (Brown 2003) with Corot Much less detetections for DF/F = 0.1 – 0.4% than expected from Brown 2003 Reasons: (minor) lacking detc. efficiency for faint/long-periodic objects (major) overestimation by Brown – different sample assumptions

  10. (adapted from Brown 2003) Astronomical Sources of false alarms We look for: PLANETS Confusion from: • UNDILUTED BINARIES Eclipses of stellar components with large mass ratio Grazing Eclipsing Binaries • DILUTED BINARIES Eclipsing Binaries with deep eclipses + light from a bright 3rd star → shallow eclipses Eclipsing Binaries + unrelated (fg/bg) star within psf Eclipsing Binaries in triple system

  11. Results from Follow-Up Observations (IRa01,LRa01,LRc01) • 122 candidates in Follow-Up lists • 49 solved by Follow-Up (40 %)

  12. False alarm rates • Brown 2003 • R<12 • 20” confusion radius

  13. Some Special cases of binary configurations found in the planet detection effort

  14. Planet candidate + eclipsing binary in the same mask • Found by Aviv Ofir dF/F = 0.9 % Eclipsing binary 1.1 d period Planet candidate 13.5 d period

  15. Two objects separated 4”

  16. 2 binaries in the same mask 211625668=SRc01_E2_1728 Original LC LC – Binary (1.772 d) Folded (2.628 d) 7 cases in 5 fields (0.015%)

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