Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of the tidal deformation of WASP-103b at $3\,\sigma$ with
  CHEOPS   WASP-103b is the exoplanet with the highest expected deformation signature in
its transit light curve and one of the shortest expected spiral-in times.
Measuring the tidal deformation of the planet would allow us to estimate the
second degree fluid Love number and gain insight into the planet's internal
structure. Moreover, measuring the tidal decay timescale would allow us to
estimate the stellar tidal quality factor, which is key to constraining stellar
physics.
  We obtained 12 transit light curves of WASP-103b with the CHEOPS to estimate
the tidal deformation and tidal decay of this extreme system. We modelled the
high-precision CHEOPS transit light curves together with systematic
instrumental noise using multi-dimensional Gaussian process regression informed
by a set of instrumental parameters. To model the tidal deformation, we used a
parametrisation model which allowed us to determine the second degree fluid
Love number of the planet. We combined our light curves with previously
observed transits of WASP-103b with HST and Spitzer.
  We estimate the radial Love number of WASP-103b to be $h_f =
1.59^{+0.45}_{-0.53}$. This is the first time that the tidal deformation is
directly detected (at $3\, \sigma$) from the transit light curve of an
exoplanet. Combining the transit times derived from CHEOPS, with the other
transit times available in the literature, we find no significant orbital
period variation for WASP-103b. However, the data show a hint of an orbital
period increase instead of a decrease, as is expected for tidal decay. This
could be either due to a visual companion star if this star is bound, the
Applegate effect, or a statistical artefact.
  The estimated Love number of WASP-103b is similar to Jupiter's. This will
allow us to constrain the internal structure and composition of WASP-103b,
which could provide clues on the inflation of hot Jupiters. (Abridged)

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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: hep-ex