High-Resolution Transit Spectroscopy of Warm Saturns

Abstract

We present high-resolution optical transmission spectroscopy of two sub-Saturn mass transiting exoplanets, HAT-P-12b and WASP-69b. With relatively low densities and high atmospheric scale heights, these planets are particularly well-suited to characterization through transit spectroscopy, and serve as ideal candidates for extending previously-tested methods to lower planetary masses. Using a single transit for each planet, we take advantage of the Doppler cross-correlation technique to search for sodium, potassium, and water absorption features. Our analysis reveals a likely ($3.2\sigma$) detection of sodium absorption features in the atmosphere of HAT-P-12b, and enables us to place constraints on the presence of alkaline and molecular species in the atmospheres of both planets. With our results, we highlight the efficacy of ground-based campaigns for characterizing exoplanetary atmospheres, and pave the way for future analyses of low-mass planets.

arXiv comment15 pages, 11 figures

References in corpus (41)

• Analytic Lightcurves for Planetary Transit Searches
• Detection of an Extrasolar Planet Atmosphere
• A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion
• Clouds in the atmosphere of the super-Earth exoplanet GJ 1214b
• The orbital motion, absolute mass, and high-altitude winds of exoplanet HD209458b
• A high accuracy computed water line list
• Detection of oxygen and carbon in the hydrodynamically escaping atmosphere of the extrasolar planet HD209458b
• Correcting systematic effects in a large set of photometric lightcurves
• Infrared Transmission Spectroscopy of the Exoplanets HD209458b and XO-1b Using the Wide Field Camera-3 on the Hubble Space Telescope
• The prevalence of dust on the exoplanet HD 189733b from Hubble and Spitzer observations
• Hubble Space Telescope Transmission Spectroscopy of the Exoplanet HD 189733b: High-altitude atmospheric haze in the optical and near-UV with STIS
• Detection of water absorption in the day side atmosphere of HD 189733 b using ground-based high-resolution spectroscopy at 3.2 microns
• Planetary Spectrum Generator: an accurate online radiative transfer suite for atmospheres, comets, small bodies and exoplanets
• Comparative Planetary Atmospheres: Models of TrES-1 and HD209458b
• Ground-based detection of sodium in the transmission spectrum of exoplanet HD209458b
• Synthetic Spectra and Colors of Young Giant Planet Atmospheres: Effects of Initial Conditions and Atmospheric Metallicity
• Extremely Irradiated Hot Jupiters: Non-Oxide Inversions, H- Opacity, and Thermal Dissociation of Molecules
• Rotation and winds of exoplanet HD 189733 b measured with high-dispersion transmission spectroscopy
• Carbon monoxide and water vapor in the atmosphere of the non-transiting exoplanet HD 179949 b
• Spatially resolved eastward winds and rotation of HD 189733b
• Exoplanet Transit Spectroscopy Using WFC3: WASP-12 b, WASP-17 b, and WASP-19 b
• A non-grey analytical model for irradiated atmospheres. I: Derivation
• Forward and Inverse Modeling of the Emission and Transmission Spectrum of GJ 436b: Investigating Metal Enrichment, Tidal Heating, and Clouds
• HAT-P-12b: A Low-Density Sub-Saturn Mass Planet Transiting a Metal-Poor K Dwarf
• Three sub-Jupiter-mass planets: WASP-69b & WASP-84b transit active K dwarfs and WASP-70Ab transits the evolved primary of a G4+K3 binary
• Discovery of water at high spectral resolution in the atmosphere of 51 Peg b
• HST hot-Jupiter transmission spectral survey: Haze in the atmosphere of WASP-6b
• Exoplanet atmospheres with GIANO. I. Water in the transmission spectrum of HD 189733b
• Exo-Transmit: An Open-Source Code for Calculating Transmission Spectra for Exoplanet Atmospheres of Varied Composition
• Detection of sodium in the atmosphere of WASP-69b
• The GAPS Programme with HARPS-N at TNG XVI: Measurement of the Rossiter-McLaughlin effect of the transiting planetary systems HAT-P-3, HAT-P-12, HAT-P-22, WASP-39 and WASP-60
• A Near-Infrared Transmission Spectrum for the Warm Saturn HAT-P-12b
• The effect of the stellar absorption line centre-to-limb variation on exoplanet transmission spectrum observations
• Search for water in a super-Earth atmosphere: High-resolution optical spectroscopy of 55 Cancri e
• The origin of the excess transit absorption in the HD 189733 system: planet or star?
• Deciphering the atmosphere of HAT-P-12b: solving discrepant results
• Identifying new opportunities for exoplanet characterisation at high spectral resolution
• Ground-Based Transit Observations of the Super-Earth 55 Cnc e
• Diagnosing aerosols in extrasolar giant planets with cross-correlation function of water bands
• GRACES: Gemini remote access to CFHT ESPaDOnS Spectrograph through the longest astronomical fiber ever made (Experimental phase completed.)
• Search for Rayleigh scattering in the atmosphere of GJ1214b

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• Ground-based Atmospheric Characterization of Super-Earth L 98-59 d at High Spectral Resolution
• Day-side Fe I Emission, Day-Night Brightness Contrast and Phase Offset of the Exoplanet WASP-33b