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  1. Pubblicazioni

The stable climate of KELT-9b

Articolo
Data di Pubblicazione:
2022
Abstract:
Even among the most irradiated gas giants, so-called ultra-hot Jupiters, KELT-9b stands out as the hottest planet thus far discovered with a dayside temperature of over 4500 K. At these extreme irradiation levels, we expect an increase in heat redistribution efficiency and a low Bond albedo owed to an extended atmosphere with molecular hydrogen dissociation occurring on the planetary dayside. We present new photometric observations of the KELT-9 system throughout 4 full orbits and 9 separate occultations obtained by the 30 cm space telescope CHEOPS. The CHEOPS bandpass, located at optical wavelengths, captures the peak of the thermal emission spectrum of KELT-9b. In this work we simultaneously analyse CHEOPS phase curves along with public phase curves from TESS and Spitzer to infer joint constraints on the phase curve variation, gravity-darkened transits, and occultation depth in three bandpasses, as well as derive 2D temperature maps of the atmosphere at three different depths. We find a day-night heat redistribution efficiency of similar to 0.3 which confirms expectations of enhanced energy transfer to the planetary nightside due to dissociation and recombination of molecular hydrogen. We also calculate a Bond albedo consistent with zero. We find no evidence of variability of the brightness temperature of the planet, excluding variability greater than 1% (1 sigma).
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
techniques: photometric; instrumentation: photometers; planets and satellites: atmospheres; planets and satellites: gaseous planets; eclipses; occultations
Elenco autori:
K. Jones; B. M. Morris; B.-O. Demory; K. Heng; M. J. Hooton; N. Billot; D. Ehrenreich; S. Hoyer; A. E. Simon; M. Lendl; O. D. S. Demangeon; S. G. Sousa; A. Bonfanti; T. G. Wilson; S. Salmon; Sz. Csizmadia; H. Parviainen; G. Bruno; Y. Alibert; R. Alonso; G. Anglada; T. B??rczy; D. Barrado; S. C. C. Barros; W. Baumjohann; M. Beck; T. Beck; W. Benz; X. Bonfils; A. Brandeker; C. Broeg; J. Cabrera; S. Charnoz; A. Collier Cameron; M. B. Davies; M. Deleuil; A. Deline; L. Delrez; A. Erikson; A. Fortier; L. Fossati; M. Fridlund; D. Gandolfi; M. Gillon; M. G??del; K. G. Isaak; L. L. Kiss; J. Laskar; A. Lecavelier des Etangs; C. Lovis; D. Magrin; P. F. L. Maxted; V. Nascimbeni; G. Olofsson; R. Ottensamer; I. Pagano; E. Pall??; G. Peter; G. Piotto; D. Pollacco; D. Queloz; R. Ragazzoni; N. Rando; F. Ratti; H. Rauer; C. Reimers; I. Ribas; N. C. Santos; G. Scandariato; D. S??gransan; A. M. S. Smith; M. Steller; Gy. M. Szab??; N. Thomas; S. Udry; V. Van Grootel; I. Walter; N. A. Walton; W. Wang Jungo
Autori di Ateneo:
GANDOLFI Davide
Link alla scheda completa:
https://iris.unito.it/handle/2318/1948620
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/1948620/1220770/Jones_2022.pdf
Pubblicato in:
ASTRONOMY & ASTROPHYSICS
Journal
Progetto:
GANDOLFI D. - Fondaz.CRT - II tornata 2018 - Rif. 2018.2323 - "Gaseous or rocky? Unveiling the nature of small worlds"
  • Dati Generali
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Dati Generali

URL

https://www.aanda.org/articles/aa/full_html/2022/10/aa43823-22/aa43823-22.html

Aree Di Ricerca

Settori (2)


PE9_3 - Exoplanetary science, formation and characterization of extrasolar planets - (2022)

SCIENZE MATEMATICHE, CHIMICHE, FISICHE - Cosmologia e Universo
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