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Exosolar Giant Planet Science GSMT vs. JWST

Exosolar Giant Planet Science GSMT vs. JWST. Terry Herter February 12, 2004. Based on material from: “Exosolar Planets” by Lunine for GSMT 4/28/03 “Planet Detection, Characterizing Extra-solar Planets” by Najita, Mueller, Mountain & Strom for GSMT 3/17/03 And GSMT-Report and JWST website.

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Exosolar Giant Planet Science GSMT vs. JWST

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  1. Exosolar Giant Planet Science GSMT vs. JWST Terry Herter February 12, 2004 • Based on material from: • “Exosolar Planets” by Lunine for GSMT 4/28/03 • “Planet Detection, Characterizing Extra-solar Planets” by Najita, Mueller, Mountain & Strom for GSMT 3/17/03 • And GSMT-Report and JWST website

  2. EGP science • What are the origins of the range of orbital distances and eccentricities? • Metallicity contrast between the planet and star will help understand formation mechanism • Characterize Exo-solar planets: • Atmospheric structure, chemistry, rotation, weather, etc. (R = 10 & 200) • Key Measurements: • Detection and analysis of free floating EGPs • R = 100 - 1000 • Detection and analysis of bound EGPs • R = 100 - 1000 • Measurement of transits • High resolution spectroscopy, limited by systematics!

  3. 1 nJy It’s a hard problem • Planets are faint and near bright objects. Star suppressed by 106 Class II EGP: Cool Jupiter-Mass Planet at 1.5 AU Ammonia gaseous; water clouds in troposphere, enhancing NIR reflectivity

  4. Model of young EGP Figure from Lunine: Flux (mJy) at Earth vs. wavelength (microns) for a one Jupiter mass EGP at 108 years of age, 10 parsecs distance, isolated. Spectra for R = 1000, 100, and 10 are shown (the latter two displaced for clarity) along with corresponding GSMT sensitivities, displaced in proportion to the corresponding spectra. GSMT sensitivities, courtesy M. Mountain, are for a 104 second exposure, S/N=10, with 4 x 4 pixels across the point source and a GSMT emissivity of 10%.

  5. Sensitivity: GSMT vs. JWST GSMT is best for l < 3.5 mm

  6. Spatial Resolution GSMT wins big, but JWST has stability.

  7. Complementarity • GSMT – • Best in near-IR from both sensitivity and spatial resolution considerations • Look for EGPs closest to stars • JWST – • Best in thermal IR • Look for cooler, more distant EGPs • Look for “free floaters” • Highly stable PSF?

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