Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hot Jupiters with relatives: discovery of additional planets in orbit
  around WASP-41 and WASP-47   We report the discovery of two additional planetary companions to WASP-41 and
WASP-47. WASP-41 c is a planet of minimum mass 3.18 $\pm$ 0.20 M$_{\rm Jup}$
and eccentricity 0.29 $\pm$ 0.02, and it orbits in 421 $\pm$ 2 days. WASP-47 c
is a planet of minimum mass 1.24 $\pm$ 0.22 M$_{\rm Jup}$ and eccentricity 0.13
$\pm$ 0.10, and it orbits in 572 $\pm$ 7 days. Unlike most of the planetary
systems that include a hot Jupiter, these two systems with a hot Jupiter have a
long-period planet located at only $\sim$1 au from their host star. WASP-41 is
a rather young star known to be chromospherically active. To differentiate its
magnetic cycle from the radial velocity effect induced by the second planet, we
used the emission in the H$\alpha$ line and find this indicator well suited to
detecting the stellar activity pattern and the magnetic cycle. The analysis of
the Rossiter-McLaughlin effect induced by WASP-41 b suggests that the planet
could be misaligned, though an aligned orbit cannot be excluded. WASP-47 has
recently been found to host two additional transiting super Earths. With such
an unprecedented architecture, the WASP-47 system will be very important for
understanding planetary migration.

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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: cs
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: physics