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Variability in the Atmosphere of the Hot Jupiter Kepler-76b

The Astronomical journal, 2019-06, Vol.157 (6), p.239 [Peer Reviewed Journal]

2019. The American Astronomical Society. All rights reserved. ;Copyright IOP Publishing Jun 2019 ;ISSN: 0004-6256 ;ISSN: 1538-3881 ;EISSN: 1538-3881 ;DOI: 10.3847/1538-3881/ab1b30

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Title:
Variability in the Atmosphere of the Hot Jupiter Kepler-76b
Author: Jackson, Brian ; Adams, Elisabeth ; Sandidge, Wesley ; Kreyche, Steven ; Briggs, Jennifer
Subjects: Amplitudes ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; Atmospheric composition ; Atmospheric dynamics ; Atmospheric variability ; COSMIC DUST ; Data search ; Datasets ; Diagnostic systems ; DISTURBANCES ; ECLIPSE ; Eclipses ; EMISSION ; Extrasolar planets ; Feedback loops ; Gas giant planets ; Jupiter ; Kepler mission (NASA) ; METEOROLOGY ; PERTURBATION THEORY ; Planet detection ; PLANETARY ATMOSPHERES ; planets and satellites: atmospheres ; planets and satellites: gaseous planets ; planets and satellites: individual (Kepler-76b) ; REFLECTIVITY ; RISE ; SATELLITE ATMOSPHERES ; SATELLITES ; SENSITIVITY ; Transit ; Variability ; WAVELENGTHS
Is Part Of: The Astronomical journal, 2019-06, Vol.157 (6), p.239
Description: Phase curves and secondary eclipses of gaseous exoplanets are diagnostic of atmospheric composition and meteorology, and the long observational baseline and high photometric precision from the Kepler mission make its data set well suited for exploring phase curve variability, which provides additional insights into atmospheric dynamics. Observations of the hot Jupiter Kepler-76b span more than 1000 days, providing an ideal data set to search for atmospheric variability. In this study, we find that Kepler-76b's secondary eclipse, with a depth of 87 6 ppm, corresponds to an effective temperature of 2830 K. Our results also show clear indications of variability in Kepler-76b's atmospheric emission and reflectivity, with the phase curve amplitude typically 50.5 1.3 ppm but varying between 35 and 70 ppm over tens of days. As is common for hot Jupiters, Kepler-76b's phase curve shows a discernible offset of eastward of the substellar point and varying in concert with the amplitude. These variations may arise from the advance and retreat of thermal structures and cloud formations in Kepler-76b's atmosphere; the resulting thermal perturbations may couple with the super-rotation expected to transport aerosols, giving rise to a feedback loop. Looking forward, the Transiting Exoplanet Survey Satellite (TESS) mission can provide new insight into planetary atmospheres, with good prospects to observe both secondary eclipses and phase curves among targets from the mission. TESS's increased sensitivity in red wavelengths as compared to Kepler means that it will probably probe different aspects of planetary atmospheres.
Publisher: Madison: The American Astronomical Society
Language: English
Identifier: ISSN: 0004-6256
ISSN: 1538-3881
EISSN: 1538-3881
DOI: 10.3847/1538-3881/ab1b30
Source: Alma/SFX Local Collection

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Variability in the Atmosphere of the Hot Jupiter Kepler-76b

2019. The American Astronomical Society. All rights reserved. ;Copyright IOP Publishing Jun 2019 ;ISSN: 0004-6256 ;ISSN: 1538-3881 ;EISSN: 1538-3881 ;DOI: 10.3847/1538-3881/ab1b30

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