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Published byHoratio Randall Modified over 9 years ago
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The Study of Exoplanetary Atmosphere with IGRINS Keun-Hong Park Seoul National University
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Outline Introduction Method Observation Analysis Result
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Introduction Why Exoplanetary Atmosphere? 1.Formation of the Planetary System 2.Environment of Exoplanet 3.Extraterrestrial Life
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IGRINS Instruments of the previous studies NICMOS (HST) CRIRES (VLT) OSIRIS (KECK) … IGRINS (McDonald) H & K band (1.49-2.46 ㎛ ) at once : Wide wavelength coverage R ~ 40,000 : High Resolution The Goal of this study Finding of new molecular features The properties of exoplanetary atmospheres
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Method Absorption line in Primary Eclipse Thermal emission in Secondary Eclipse
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Method
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Observation Month/YearNightsObservation Result 2014 T3 09/2014 3Cloudy 2015 T1 03/2015 2Cloudy 2015 T2 04 – 05 / 2015 3 Apr. 29 – Tau Boo May. 1 – WASP3
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Observation Tau Boo b Non-Transit Star F6IV H ~ 3.6 R planet /R star = 0.08 Observed on Apr. 29 Clear In Transit (?) : 120sec × 64, S/N ~ 1200 at 1.6 Out of Transit (?) : 120sec × 64, S/N ~ 1100 at 1.6 WASP-3 b F7V H ~ 9.4 R planet /R star = 0.11 Observed on May 1 Clear -> Cloudy In Transit : 240sec × 14, S/N ~ 120 at 1.6 Out of Transit : 240sec × 22, S/N ~ 220 at 1.6
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Analysis Line HITRAN 2012 Shift of the lines Tau Boo : Radial Velocity from SIMBAD WASP-3 : Calculation from Mg I line (1710.86 nm) 2322212019181716151413121110987654321 Long Wavelength 1.475 μm 1.816 μm CH4 HCl H2O C2H2 N2O H2S C2H2 CO2 CONH3 HI OH
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Analysis stellar Stellar - planet stellar Stellar – planet - atmosphere
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Analysis < 0.01 nm from the molecular lines Away from telluric & other contamination. Pixels of the lines > 0.05 nm from the molecular lines Away from telluric & other contamination. Pixels of the continuum K-S Test Probability that two groups are same Low Probability : Differences between lines & Continuum
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Result K-S test with 11 molecular in the spectra of two target stars. Expected Result Tau Boo (non-Transit) : All of the probabilities are high. WASP-3 (Transit) : Some of the probabilities are low. WASP-3 Couldn’t find any evidence of the atmosphere
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Result Tau Boo CH4, NH3, H2S shows the low probability. ????
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Thank You
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