Astron. J., 154, 242-242 (2017/December-4)
The broadband and spectrally resolved H-band eclipse of KELT-1b and the role of surface gravity in stratospheric inversions in hot Jupiters.
BEATTY T.G., MADHUSUDHAN N., POGGE R., CHUNG S.M., BIERLYA A., GAUDI B.S. and LATHAM D.W.
Abstract (from CDS):
We present a high-precision H-band emission spectrum of the transiting brown dwarf KELT-1b, which we spectrophotometrically observed during a single secondary eclipse using the LUCI1 multiobject spectrograph on the Large Binocular Telescope. Using a Gaussian-process regression model, we are able to clearly measure the broadband eclipse depth as ΔH = 1418 ± 94 ppm. We are also able to spectrally resolve the H band into five separate wave channels and measure the eclipse spectrum of KELT-1b at R ≃ 50 with an average precision of ±135 ppm. We find that the day side has an average brightness temperature of 3250 ± 50 K, with significant variation as a function of wavelength. Based on our observations and previous measurements of KELT-1b's eclipse at other wavelengths, we find that KELT-1b's day side appears identical to an isolated 3200 K brown dwarf, and our modeling of the atmospheric emission shows a monotonically decreasing temperature-pressure profile. This is in contrast to hot Jupiters with similar day-side brightness temperatures near 3000 K, all of which appear to be either isothermal or possess a stratospheric temperature inversion. We hypothesize that the lack of an inversion in KELT-1b is due to its high surface gravity, which we argue could be caused by the increased efficiency of cold-trap processes within its atmosphere.
© 2017. The American Astronomical Society. All rights reserved.
brown dwarfs - planets and satellites: atmospheres - techniques: imaging spectroscopy - techniques: imaging spectroscopy
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