The Study of Exoplanetary Atmosphere with IGRINS Keun-Hong Park Seoul National University

Outline Introduction Method Observation Analysis Result

Introduction Why Exoplanetary Atmosphere? 1.Formation of the Planetary System 2.Environment of Exoplanet 3.Extraterrestrial Life

IGRINS Instruments of the previous studies NICMOS (HST) CRIRES (VLT) OSIRIS (KECK) … IGRINS (McDonald) H & K band ( ㎛ ) 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

Method Absorption line in Primary Eclipse Thermal emission in Secondary Eclipse

Method

Observation Month/YearNightsObservation Result 2014 T3 09/2014 3Cloudy 2015 T1 03/2015 2Cloudy 2015 T2 04 – 05 / Apr. 29 – Tau Boo May. 1 – WASP3

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

Analysis Line HITRAN 2012 Shift of the lines Tau Boo : Radial Velocity from SIMBAD WASP-3 : Calculation from Mg I line ( nm) Long Wavelength μm μm CH4 HCl H2O C2H2 N2O H2S C2H2 CO2 CONH3 HI OH

Analysis stellar Stellar - planet stellar Stellar – planet - atmosphere

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

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

Result Tau Boo CH4, NH3, H2S shows the low probability. ????

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