Examining the broadband emission spectrum of WASP-19b: A new z-band eclipse detection

George Zhou, Lucyna Kedziora-Chudczer, Daniel D R Bayliss, Jeremy Bailey

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    13 Citations (Scopus)


    WASP-19b is one of the most irradiated hot-Jupiters known. Its secondary eclipse is the deepest of all transiting planets and has been measured in multiple optical and infrared bands. We obtained a z-band eclipse observation with a measured depth of 0.080% ± 0.029%, using the 2 m Faulkes Telescope South, which is consistent with the results of previous observations. We combined our measurement of the z-band eclipse with previous observations to explore atmosphere models of WASP-19b that are consistent with its broadband spectrum. We use the VSTAR radiative transfer code to examine the effect of varying pressure-temperature profiles and C/O abundance ratios on the emission spectrum of the planet. We find that models with super-solar carbon enrichment best match the observations, which is consistent with previous model retrieval studies. We also include upper atmosphere haze as another dimension in the interpretation of exoplanet emission spectra and find that particles <0.5 μm in size are unlikely to be present in WASP-19b.

    Original languageEnglish
    Article number118
    Pages (from-to)1-8
    Number of pages8
    JournalAstrophysical Journal
    Issue number2
    Publication statusPublished - 10 Sept 2013


    • planets and satellites: atmospheres
    • planets and satellites: individual (WASP-19b)


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