Marc Kuchner

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Keck Interferometer Nuller Shared-Risk Science
Program
Marc Kuchner Harvard-Smithsonian Center for
Astrophysics
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Zodiacal Light Clementine 1994
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?
Terrestrial Planet Finder /Darwin
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Terrestrial Planet Finder /Darwin
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IRAM Plateau de Bure 1.3 mm
arcsec
Vega
arcsec
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Keck Interferometer Nuller Shared-Risk Science
Program
1) YSO Disks 2) Exozodiacal Dust 3) Hot Jupiters
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Keck Nulling Interferometer
Keck Thermal Background Remover and High Accuracy
Interferometer
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Terms with no Thermal Background Real Source
Intensity
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TW Hydra, NICMOS
1) YSO disks
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star
interior
rim
surface
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Magnetic Truncation ?
Balbus-Hawley Turbulence?
1500 K Small Grain Sublimation
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? Eridani, JCMT
2) Exozodiacal Dust
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ZODIPIC http//cfa-www.harvard.edu/mkuchner
Optically-Thin Dust Disk Modeling Software IDL
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Image 1-Visibility
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• Simulate Keck Nuller Data
• Photon Noise
• Stellar Leak (10 Uncertain)
• (u,v) coverage for star
• Distribution of i, PA
• 0.5 ?m bands covering 10-12.5?m

Try to Recover Optical Depth of Cloud from
Simulated Data by Fitting Models
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simulated measurement error
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nights
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resulting uncertainty in measurement of 10x Solar
Cloud optical depth
assumed uncertainty in stellar leakage
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gt800 K, lt20 pc Roaster (lt0.5 AU) or Young
(lt10 years)
3) Hot Jupiters
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• Inside Quadratic Null
• star and planet are spectrally
• degenerate (? )
• planet ? and flux are degenerate
• Break with
• (u,v) coverage?
• knowledge of stellar leak?

-4
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• Simulate Keck Nuller Data
• Photon Noise
• Stellar Leak (10 Uncertain)
• (u,v) coverage for star
• 1 night, zenith angle lt 45
• 50 Observing Efficiency
• Distribution of i,?

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Principle Investigators Wesley Traub Marc
Kuchner Co-Investigators Dana Backman Matthew
Holman Ray Jayawardhana Rafael Millan-Gabet John
Monnier Andreas Quirrenbach JPL
Collaborators Mark Colavita Michelle
Creech-Eakman Chris Koresko Bertrand
Mennesson Gene Searbyn