The GAPS Programme at TNG XXXIX -- Multiple molecular species in the atmosphere of the warm giant planet WASP-80 b unveiled at high resolution with GIANO-B

Abstract

Detections of molecules in the atmosphere of gas giant exoplanets allow us to investigate the physico-chemical properties of the atmospheres. Their inferred chemical composition is used as tracer of planet formation and evolution mechanisms. Currently, an increasing number of detections is showing a possible rich chemistry of the hotter gaseous planets, but whether this extends to cooler giants is still unknown. We observed four transits of WASP-80 b, a warm transiting giant planet orbiting a late-K dwarf star with the near-infrared GIANO-B spectrograph installed at the Telescopio Nazionale Galileo and performed high resolution transmission spectroscopy analysis. We report the detection of several molecular species in its atmosphere. Combining the four nights and comparing our transmission spectrum to planetary atmosphere models containing the signature of individual molecules within the cross-correlation framework, we find the presence of H2O, CH4, NH3 and HCN with high significance, tentative detection of CO2, and inconclusive results for C2H2 and CO. A qualitative interpretation of these results, using physically motivated models, suggests an atmosphere consistent with solar composition and the presence of disequilibrium chemistry and we therefore recommend the inclusion of the latter in future modelling of sub-1000K planets.

arXiv comment12 pages, 4 figures. AJ, Accepted July 11th, 2022

References in corpus (52)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion
• ExoMol molecular line lists XXX: a complete high-accuracy line list for water
• The ExoMol database: molecular line lists for exoplanet and other hot atmospheres
• C/O ratio as a Dimension for Characterizing Exoplanetary Atmospheres
• A variationally computed line list for hot NH3
• The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets
• Exoplanetary Atmospheres: Key Insights, Challenges and Prospects
• High C/O Ratio and Weak Thermal Inversion in the Very Hot Atmosphere of Exoplanet WASP-12b
• A population study of gaseous exoplanets
• ExoMol line lists III: An improved hot rotation-vibration line list for HCN and HNC
• Chemical consequences of the C/O ratio on hot Jupiters: Examples from WASP-12b,CoRoT-2b, XO-1b, and HD 189733b
• Retrieving Temperatures and Abundances of Exoplanet Atmospheres with High-Resolution Cross-Correlation Spectroscopy
• Rotation and winds of exoplanet HD 189733 b measured with high-dispersion transmission spectroscopy
• The Near-Infrared and Optical Spectra of Methane Dwarfs and Brown Dwarfs
• ExoMol molecular line lists XXXV: a rotation-vibration line list for hot ammonia
• Improved HCN/HNC linelist, model atmospheres and synthetic spectra for WZ Cas
• An accurate, extensive, and practical line list of methane for the HITEMP database
• Tracing the formation history of giant planets in protoplanetary disks with Carbon, Oxygen, Nitrogen and Sulphur
• HELIOS: An Open-source, GPU-accelerated Radiative Transfer Code For Self-consistent Exoplanetary Atmospheres
• Five carbon- and nitrogen-bearing species in a hot giant planet's atmosphere
• Retrieval analysis of 38 WFC3 transmission spectra and resolution of the normalisation degeneracy
• Neutral Iron Emission Lines From The Day-side Of KELT-9b -- The GAPS Programme With HARPS-N At TNG XX
• GENESIS: New Self-Consistent Models of Exoplanetary Spectra
• ExoMol molecular line lists -- XXXVII: spectra of acetylene
• Chemical Kinetics on Extrasolar Planets
• WASP-80b has a dayside within the T-dwarf range
• WASP-80b: a gas giant transiting a cool dwarf
• Analytical Models of Exoplanetary Atmospheres. II. Radiative Transfer via the Two-stream Approximation
• Thermal Emission from Transiting Very-Hot Jupiters: Prospects for Ground-based Detection at Optical Wavelengths
• TEA: A Code for Calculating Thermochemical Equilibrium Abundances
• A unique hot Jupiter spectral sequence with evidence for compositional diversity
• The GAPS programme at TNG XXII. The GIARPS view of the extended helium atmosphere of HD189733 b accounting for stellar activity
• Molecular Cross Sections for High Resolution Spectroscopy of Super Earths, Warm Neptunes and Hot Jupiters
• The Pyrat Bay Framework for Exoplanet Atmospheric Modeling: A Population Study of Hubble/WFC3 Transmission Spectra
• The GAPS Programme with HARPS-N at TNG XIX. Atmospheric Rossiter-McLaughlin effect and improved parameters of KELT-9b
• The GAPS Programme at TNG XXI -- A GIARPS case-study of known young planetary candidates: confirmation of HD 285507 b and refutation of AD Leo b
• A H13CN/HN13C linelist, model atmospheres and synthetic spectra for carbon stars
• Physical properties and transmission spectrum of the WASP-80 planetary system from multi-colour photometry
• Prospects for Characterizing the Haziest Sub-Neptune Exoplanets with High Resolution Spectroscopy
• LRG-BEASTS III: Ground-based transmission spectrum of the gas giant orbiting the cool dwarf WASP-80
• Exoplanet Atmospheres at High Spectral Resolution
• The GAPS Programme at TNG XXVII. Reassessment of a young planetary system with HARPS-N: is the hot Jupiter V830 Tau b really there?
• The GAPS Programme at TNG. XXXII. The revealing non-detection of metastable HeI in the atmosphere of the hot Jupiter WASP-80b
• An Algorithm to Compress Line-transition Data for Radiative-transfer Calculations
• Multi-band high resolution spectroscopy rules out the hot Jupiter BD+20 1790b - First data from the GIARPS Commissioning
• Exploring the link between star and planet formation with Ariel
• Probing the atmosphere of a sub-Jovian planet orbiting a cool dwarf
• The GTC exoplanet transit spectroscopy survey VIII. Flat transmission spectrum for the warm gas giant WASP-80
• The GAPS Programme at TNG -- XXIV. An eccentric Neptune-mass planet near the inner edge of the BD-11 4672 habitable zone

Cited by in corpus (15)

• Chemical Diversity in Protoplanetary Disks and Its Impact on the Formation History of Giant Planets
• Robustness Measures for Molecular Detections using High-Resolution Transmission Spectroscopy of Exoplanets
• CRIRES+ and ESPRESSO reveal an atmosphere enriched in volatiles relative to refractories on the ultra-hot Jupiter WASP-121b
• The GAPS Programme at TNG LV. Multiple molecular species in the atmosphere of HAT-P-11 b and review of the HAT-P-11 planetary system
• Transmission spectroscopy of the lowest-density gas giant: metals and a potential extended outflow in HAT-P-67b
• The chemical evolution of the solar neighbourhood for planet-hosting stars
• Ariel stellar characterisation II. Chemical abundances of carbon, nitrogen, and oxygen for 181 planet-host FGK dwarf stars
• Planet formation in chemically diverse and evolving discs -- I. Composition of planetary building blocks
• A Population Analysis of 20 Exoplanets Observed from the Optical to the Near-infrared Wavelengths with HST: Evidence for Widespread Stellar Contamination
• Probing reflection from aerosols with the near-infrared dayside spectrum of WASP-80b
• The GAPS programme at TNG LXVI. A homogeneous search for Na i and its possible variability in ten gas giant exoplanets
• The GAPS Programme at TNG. LXIX.The Dayside of WASP-76b revealed by GIANO-B, HARPS-N and ESPRESSO: Evidence for Three-Dimensional Atmospheric Effects
• Exploring Synergies between Twinkle and Ariel: a Pilot Study
• Unraveling the Mystery of the Peculiar and Young Hot Jupiter CoRoT-2b. I. H${}_2$O and CO Detection from Dayside Observations with Gemini-S/IGRINS
• Probing the geological setting of exoplanets through atmospheric analysis: using Mars as a test case