Mon. Not. R. Astron. Soc., 509, 1447-1464 (2022/January-1)
The ultra-hot-Jupiter KELT-16 b: dynamical evolution and atmospheric properties.
MANCINI L., SOUTHWORTH J., NAPONIELLO L., BASTURK O., BARBATO D., BIAGIOTTI F., BRUNI I., CABONA L., D'AGO G., DAMASSO M., ERDEM A., EVANS D., HENNING T., OZTURK O., RICCI D., SOZZETTI A., TREGLOAN-REED J. and YALCINKAYA S.
Abstract (from CDS):
We present broad-band photometry of 30 planetary transits of the ultra-hot-Jupiter KELT-16 b, using five medium-class telescopes. The transits were monitored through standard B, V, R, I filters and four were simultaneously observed from different places, for a total of 36 new light curves. We used these new photometric data and those from the TESS space telescope to review the main physical properties of the KELT-16 planetary system. Our results agree with previous measurements but are more precise. We estimated the mid-transit times for each of these transits and combined them with others from the literature to obtain 69 epochs, with a time baseline extending over more than 4 yr, and searched for transit time variations. We found no evidence for a period change, suggesting a lower limit for orbital decay at 8 Myr, with a lower limit on the reduced tidal quality factor of Q^′^*> (1.9 ±0.8) ×10^5 with 95 per cent confidence. We built up an observational, low-resolution transmission spectrum of the planet, finding evidence of the presence of optical absorbers, although with a low significance. Using TESS data, we reconstructed the phase curve finding that KELT-16 b has a phase offset of 25.25 ± 14.03 °E, a day- and night-side brightness temperature of 3190 ± 61 K and 2668 ± 56 K, respectively. Finally, we compared the flux ratio of the planet over its star at the TESS and Spitzer wavelengths with theoretical emission spectra, finding evidence of a temperature inversion in the planet's atmosphere, the chemical composition of which is preferably oxygen-rich rather than carbon-rich.
© 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society
methods: data analysis - techniques: photometric - stars: fundamental parameters - stars: individual: KELT-16 - planetary systems
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<Available at CDS (J/MNRAS/509/1447): table1.dat lc/*>
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