Signs of strong Na and K absorption in the transmission spectrum of WASP-103b

Abstract

Context: Transmission spectroscopy has become a prominent tool for characterizing the atmospheric properties on close-in transiting planets. Recent observations have revealed a remarkable diversity in exoplanet spectra, which show absorption signatures of Na, K and ${\mathrm{H}}_2\mathrm{O}$, in some cases partially or fully attenuated by atmospheric aerosols. Aerosols (clouds and hazes) themselves have been detected in the transmission spectra of several planets thanks to wavelength-dependent slopes caused by the particles' scattering properties. Aims: We present an optical 550 - 960 nm transmission spectrum of the extremely irradiated hot Jupiter WASP-103b, one of the hottest (2500 K) and most massive (1.5 $M_J$) planets yet to be studied with this technique. WASP-103b orbits its star at a separation of less than 1.2 times the Roche limit and is predicted to be strongly tidally distorted. Methods: We have used Gemini/GMOS to obtain multi-object spectroscopy hroughout three transits of WASP-103b. We used relative spectrophotometry and bin sizes between 20 and 2 nm to infer the planet's transmission spectrum. Results: We find that WASP-103b shows increased absorption in the cores of the alkali (Na, K) line features. We do not confirm the presence of any strong scattering slope as previously suggested, pointing towards a clear atmosphere for the highly irradiated, massive exoplanet WASP-103b. We constrain the upper boundary of any potential cloud deck to reside at pressure levels above 0.01 bar. This finding is in line with previous studies on cloud occurrence on exoplanets which find that clouds dominate the transmission spectra of cool, low surface gravity planets while hot, high surface gravity planets are either cloud-free, or possess clouds located below the altitudes probed by transmission spectra.

arXiv commentAccepted for publication in A&A

References in corpus (43)

• Analytic Lightcurves for Planetary Transit Searches
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• Cosmic-Ray Rejection by Laplacian Edge Detection
• Detection of an Extrasolar Planet Atmosphere
• A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion
• Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
• Infrared Transmission Spectroscopy of the Exoplanets HD209458b and XO-1b Using the Wide Field Camera-3 on the Hubble Space Telescope
• Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
• Rayleigh scattering in the transit spectrum of HD 189733b
• The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO-3b
• Limb darkening and exoplanets: testing stellar model atmospheres and identifying biases in transit parameters
• The Near-Infrared and Optical Spectra of Methane Dwarfs and Brown Dwarfs
• Tidal Evolution of Close-in Planets
• HST hot-Jupiter transmission spectral survey: detection of potassium in WASP-31b along with a cloud deck and Rayleigh scattering
• The Transit Light Curve (TLC) Project. I. Four Consecutive Transits of the Exoplanet XO-1b
• HST hot Jupiter transmission spectral survey: evidence for aerosols and lack of TiO in the atmosphere of WASP-12b
• A consistent retrieval analysis of 10 Hot Jupiters observed in transmission
• Statistical properties of exoplanets. I. The period distribution: constraints for the migration scenario
• The Apparently Decaying Orbit of WASP-12
• Transmission Spectroscopy of the Hot-Jupiter WASP-12b from 0.7 to 5 microns
• Exoplanet Transit Spectroscopy Using WFC3: WASP-12 b, WASP-17 b, and WASP-19 b
• Quantifying and Predicting the Presence of Clouds in Exoplanet Atmospheres
• Friends of Hot Jupiters. IV. Stellar companions beyond 50 AU might facilitate giant planet formation, but most are unlikely to cause Kozai-Lidov migration
• The thermal emission of the young and massive planet CoRoT-2b at 4.5 and 8 microns
• On Correlated-noise Analyses Applied To Exoplanet Light Curves
• Probing the extreme planetary atmosphere of WASP-12b
• Rayleigh scattering by H2 in the extrasolar planet HD209458b
• VLT FORS2 comparative transmission spectroscopy: Detection of Na in the atmosphere of WASP-39b from the ground
• WASP-103b: a new planet at the edge of tidal disruption
• A Cloudiness Index for Transiting Exoplanets Based on the Sodium and Potassium Lines: Tentative Evidence for Hotter Atmospheres Being Less Cloudy at Visible Wavelengths
• A Lucky Imaging search for stellar sources near 74 transit hosts
• TEA: A Code for Calculating Thermochemical Equilibrium Abundances
• A simple model of the reflection effect for the interacting binaries and extrasolar planets
• FORS2 observes a multi-epoch transmission spectrum of the hot Saturn-mass exoplanet WASP-49b
• Distorted, non-spherical transiting planets: impact on the transit depth and on the radius determination
• High-precision photometry by telescope defocussing. VII. The ultra-short period planet WASP-103
• The GTC exoplanet transit spectroscopy survey. VII. Detection of sodium in WASP-52b's cloudy atmosphere
• Potassium detection in the clear atmosphere of a hot-Jupiter: FORS2 transmission spectroscopy of WASP-17b
• Near-Infrared Emission Spectrum of WASP-103b using Hubble Space Telescope/Wide Field Camera 3
• A transiting planet among 23 new near-threshold candidates from the OGLE survey - OGLE-TR-182
• Contamination from a nearby star cannot explain the anomalous transmission spectrum of the ultra-short period giant planet WASP-103b
• Spectral Resolution-linked Bias in Transit Spectroscopy of Extrasolar Planets
• Testing connections between exo-atmospheres and their host stars. GEMINI-N/GMOS ground-based transmission spectrum of Qatar-1b

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• Multi-season optical modulation phased with the orbit of the super-Earth 55 Cnc e
• On spectroscopic phase-curve retrievals: H2 dissociation and thermal inversion in the atmosphere of the ultra-hot Jupiter WASP-103 b
• Three Hot-Jupiters on the upper edge of the mass-radius distribution: WASP-177, WASP-181 and WASP-183
• WASP-147b, 160Bb, 164b and 165b: two hot Saturns and two Jupiters, including two planets with metal-rich hosts
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• Homogeneous Transit Timing Analyses of Ten Exoplanet Systems
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• Synergies between space telescopes in the photometric characterization of the atmospheres of Hot Jupiters