Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: KELT-17b: A hot-Jupiter transiting an A-star in a misaligned orbit
  detected with Doppler tomography   We present the discovery of a hot-Jupiter transiting the V=9.23 mag
main-sequence A-star KELT-17 (BD+14 1881). KELT-17b is a 1.31 -0.29/+0.28 Mj,
1.525 -0.060/+0.065 Rj hot-Jupiter in a 3.08 day period orbit misaligned at
-115.9 +/- 4.1 deg to the rotation axis of the star. The planet is confirmed
via both the detection of the radial velocity orbit, and the Doppler
tomographic detection of the shadow of the planet over two transits. The nature
of the spin-orbit misaligned transit geometry allows us to place a constraint
on the level of differential rotation in the host star; we find that KELT-17 is
consistent with both rigid-body rotation and solar differential rotation rates
(alpha < 0.30 at 2 sigma significance). KELT-17 is only the fourth A-star with
a confirmed transiting planet, and with a mass of 1.635 -0.061/+0.066 Msun,
effective temperature of 7454 +/- 49 K, and projected rotational velocity v sin
I_* = 44.2 -1.3/+1.5 km/s; it is amongst the most massive, hottest, and most
rapidly rotating of known planet hosts.

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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph