Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of Na, K, and H$\alpha$ absorption in the atmosphere of
  WASP-52b using ESPRESSO   WASP-52b is a low density hot Jupiter orbiting a moderately active K2V star.
Previous low-resolution studies have revealed a cloudy atmosphere and found
atomic Na above the cloud deck. Here we report the detection of excess
absorption at the Na doublet, the H$\alpha$ line, and the K D$_1$ line. We
derived a high-resolution transmission spectrum based on three transits of
WASP-52b, observed with the ultra stable, high-resolution spectrograph ESPRESSO
at the VLT. We measure a line contrast of $1.09\pm 0.16$% for Na D$_1$,
$1.31\pm 0.13$% for Na D$_2$, $0.86\pm 0.13$% for H$\alpha$, and $0.46\pm
0.13$% for K D$_1$, with a line FWHM range of 11-22 km s$^{-1}$. We also find
that the velocity shift of these detected lines during the transit is
consistent with the planet orbital motion, thus confirming their planetary
origin. We do not observe any significant net blueshift or redshift that can be
attributed to planetary winds. We use activity indicator lines as control but
find no excess absorption. However, we do notice signatures arising from the
Center-to-Limb variation (CLV) and the Rossiter-McLaughlin (RM) effect at these
control lines. This highlights the importance of the CLV+RM correction in
correctly deriving the transmission spectrum, which, if not corrected, could
resemble or cancel out planetary absorption in certain cases. WASP-52b is the
second non-ultra-hot Jupiter to show excess H$\alpha$ absorption, after HD
189733b. Future observations targeting non-ultra-hot Jupiters that show
H$\alpha$ could help reveal the relation between stellar activity and the
heating processes in the planetary upper atmosphere.

22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: eess