Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Detection of a Helium Exosphere for the Hot Jupiter WASP-12b   An exosphere was recently detected around the exoplanet WASP-107b, a
low-density, warm Neptune, based on an absorption feature from metastable
helium (which has a vacuum wavelength of 10833 \AA). Inspired by the WASP-107b
detection, we reanalyzed archival HST observations of another evaporating
exoplanet, WASP-12b, to search for signs of helium in its exosphere. We find no
significant increase in transit depth at 10833 \AA. We compare this result to
theoretical predictions from a 1D model, and find that the expected helium
feature amplitude is small, in agreement with the observed non-detection. We
discuss possible explanations for why the helium feature is weaker for WASP-12b
than WASP-107b, and conclude that the amplitude of the signal is highly
sensitive to the stellar spectrum and the geometry of the evaporating gas
cloud. These considerations should be taken into account in the design of
future searches for helium exospheres.

16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph