Mining the Ultra-Hot Skies of HAT-P-70b: Detection of a Profusion of Neutral and Ionized Species

Abstract

With an equilibrium temperature above 2500 K, the recently discovered HAT-P-70 b belongs to a new class of exoplanets known as ultra-hot Jupiters: extremely irradiated gas giants with day-side temperatures that resemble those found in stars. These ultra-hot Jupiters are among the most amenable targets for follow-up atmospheric characterization through transmission spectroscopy. Here, we present the first analysis of the transmission spectrum of HAT-P-70 b using high-resolution data from the HARPS-N spectrograph of a single transit event. We use a cross-correlation analysis and transmission spectroscopy to look for atomic and molecular species in the planetary atmosphere. We detect absorption by Ca II, Cr I, Cr II, Fe I, Fe II, H I, Mg I, Na I and V I, and we find tentative evidence of Ca I and Ti II. Overall, these signals appear blue-shifted by a few km s${}^{-1}$, suggestive of winds flowing at high velocity from the day-side to the night-side. We individually resolve the Ca II H & K lines, the Na I doublet, and the H$\alpha$, H$\beta$ and H$\gamma$ Balmer lines. The cores of the Ca II and H I lines form well above the continuum, indicating the existence of an extended envelope. We refine the obliquity of this highly misaligned planet to $107.9_{-1.7}^{+2.0}$ degrees by examining the Doppler shadow that the planet casts on its A-type host star. These results place HAT-P-70 b as one of the exoplanets with the highest number of species detected in its atmosphere.

17 pages, 10 figures, accepted to AJ

References in corpus (30)

• Array Programming with NumPy
• Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
• Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
• The fast spin-rotation of a young extrasolar planet
• A spectral survey of an ultra-hot Jupiter: Detection of metals in the transmission spectrum of KELT-9 b
• Detection of Fe I in the atmosphere of the ultra-hot Jupiter WASP-121b, and a new likelihood-based approach for Doppler-resolved spectroscopy
• Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) IV. A spectral inventory of atoms and molecules in the high-resolution transmission spectrum of WASP-121 b
• HELIOS-K 2.0 Opacity Calculator and Open-source Opacity Database for Exoplanetary Atmospheres
• Self-luminous and irradiated exoplanetary atmospheres explored with HELIOS
• Atmospheric Rossiter-McLaughlin effect and transmission spectroscopy of WASP-121b with ESPRESSO
• Neutral Iron Emission Lines From The Day-side Of KELT-9b -- The GAPS Programme With HARPS-N At TNG XX
• Ionized calcium in the atmospheres of two ultra-hot exoplanets WASP-33b and KELT-9b
• ESPRESSO high resolution transmission spectroscopy of WASP-76b
• Decomposing the Iron Cross-Correlation Signal of the Ultra-Hot Jupiter WASP-76b in Transmission using 3D Monte-Carlo Radiative Transfer
• Mass loss rate and local thermodynamic state of KELT-9 b thermosphere from the hydrogen Balmer series
• A Cloudiness Index for Transiting Exoplanets Based on the Sodium and Potassium Lines: Tentative Evidence for Hotter Atmospheres Being Less Cloudy at Visible Wavelengths
• SpectRes: A Fast Spectral Resampling Tool in Python
• Detection of ionized calcium in the atmosphere of the ultra-hot Jupiter KELT-9b
• ExoMol line lists XXIV: A new hot line list for silicon monohydride, SiH
• The atmosphere of HD 209458b seen with ESPRESSO. No detectable planetary absorptions at high resolution
• Confirmation of Asymmetric Iron Absorption in WASP-76b with HARPS
• The Influence of Host Star Spectral Type on Ultra-Hot Jupiter Atmospheres
• An inventory of atomic species in the atmosphere of WASP-121b using UVES high-resolution spectroscopy
• High-resolution Transmission Spectroscopy of MASCARA-2 b with EXPRES
• Into the Storm: Diving into the winds of the ultra hot Jupiter WASP-76 b with HARPS and ESPRESSO
• Detection of Fe\,{\sc i} Emission in the Day-side Spectrum of WASP-33b
• Rapid escape of ultra-hot exoplanet atmospheres driven by Hydrogen Balmer absorption
• Neutral Cr and V in the atmosphere of ultra hot jupiter WASP-121 b
• Detection of the hydrogen Balmer lines in the ultra-hot Jupiter WASP-33b
• Assessing telluric correction methods for Na detections with high-resolution exoplanet transmission spectroscopy

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