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The stable climate of KELT-9b
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi.ORCID-id: 0000-0002-7201-7536
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi.ORCID-id: 0000-0003-3747-7120
Rekke forfattare: 792022 (engelsk)Inngår i: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 666, artikkel-id A118Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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 ~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%

sted, utgiver, år, opplag, sider
2022. Vol. 666, artikkel-id A118
Emneord [en]
techniques: photometric, instrumentation: photometers, planets and satellites: atmospheres, planets and satellites: gaseous planets, eclipses, occultations
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-211593DOI: 10.1051/0004-6361/202243823ISI: 000869898200006OAI: oai:DiVA.org:su-211593DiVA, id: diva2:1712954
Tilgjengelig fra: 2022-11-23 Laget: 2022-11-23 Sist oppdatert: 2022-11-23bibliografisk kontrollert

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Brandeker, AlexisOlofsson, Göran

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