2022AJ....163...96B -
Astron. J., 163, 96 (2022/February-0)
Mining the ultrahot skies of HAT-P-70b: Detection of a profusion of neutral and ionized species.
BELLO-ARUFE A., CABOT S.H.C., MENDONCA J.M., BUCHHAVE L.A. and RATHCKE A.D.
Abstract (from CDS):
With an equilibrium temperature above 2500 K, the recently discovered HAT-P-70b belongs to a new class of exoplanets known as ultrahot Jupiters: extremely irradiated gas giants with day-side temperatures that resemble those found in stars. These ultrahot 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-70b 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 blueshifted 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 and K lines, the Na I doublet, and the Hα, Hβ, and Hγ 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-70b as one of the exoplanets with the highest number of species detected in its atmosphere.
Abstract Copyright:
©
Journal keyword(s):
Earth and Planetary Astrophysics
Simbad objects:
9
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