Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Aligned Orbit of WASP-148b, the Only Known Hot Jupiter with a Nearby
  Warm Jupiter Companion, from NEID and HIRES   We present spectroscopic measurements of the Rossiter-McLaughlin effect for
WASP-148b, the only known hot Jupiter with a nearby warm-Jupiter companion,
from the WIYN/NEID and Keck/HIRES instruments. This is one of the first
scientific results reported from the newly commissioned NEID spectrograph, as
well as the second obliquity constraint for a hot Jupiter system with a
close-in companion, after WASP-47. WASP-148b is consistent with being in
alignment with the sky-projected spin axis of the host star, with
$\lambda=-8^{\circ}.2^{{+8^{\circ}.7}}_{-9^{\circ}.7}$. The low obliquity
observed in the WASP-148 system is consistent with the orderly-alignment
configuration of most compact multi-planet systems around cool stars with
obliquity constraints, including our solar system, and may point to an early
history for these well-organized systems in which migration and accretion
occurred in isolation, with relatively little disturbance. By contrast,
previous results have indicated that high-mass and hot stars appear to more
commonly host a wide range of misaligned planets: not only single hot Jupiters,
but also compact systems with multiple super-Earths. We suggest that, to
account for the high rate of spin-orbit misalignments in both compact
multi-planet and isolated-hot-Jupiter systems orbiting high-mass and hot stars,
spin-orbit misalignments may be caused by distant giant planet perturbers,
which are most common around these stellar types.

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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ph
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The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: ao-sci
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The categories of this paper are: supr-con