Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The ultra-hot-Jupiter KELT-16 b: Dynamical Evolution and Atmospheric
  Properties   We present broad-band photometry of 30 planetary transits of the ultra-hot
Jupiter KELT-16b, 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
four years, 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 $Q^{\prime}_{\star}>(1.9 \pm
0.8) \times 10^5$ with $95\%$ 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-16b has a phase offset
of $25.25 \pm 14.03$ $^{\circ}$E, a day- and night-side brightness temperature
of $3190 \pm 61$ K and $2668 \pm 56$ 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.

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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas