Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radial Velocity Measurements of HR 8799 b and c with Medium Resolution
  Spectroscopy   High-contrast medium resolution spectroscopy has been used to detect
molecules such as water and carbon monoxide in the atmospheres of gas giant
exoplanets. In this work, we show how it can be used to derive radial velocity
(RV) measurements of directly imaged exoplanets. Improving upon the traditional
cross-correlation technique, we develop a new likelihood based on joint forward
modelling of the planetary signal and the starlight background (i.e.,
speckles). After marginalizing over the starlight model, we infer the
barycentric RV of HR 8799 b and c in 2010 yielding -9.2 +- 0.5 km/s and -11.6
+- 0.5 km/s respectively. These RV measurements help to constrain the 3D
orientation of the orbit of the planet by resolving the degeneracy in the
longitude of ascending node. Assuming coplanar orbits for HR 8799 b and c, but
not including d and e, we estimate \Omega = 89 (+27,-17) deg and i = 20.8
(4.5,-3.7) deg.

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The categories of this paper are: math
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg