Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radial Velocity Follow-up of Planetary Transit Candidate
  MACHO.120.22303.5389   We present preliminary results on the radial velocity follow-up of a
planetary transit candidate (P=2.43d, V=15.4) detected during the MACHO
project. The photometry is consistent with a grazing transit of an object with
radius >=1.8RJ orbiting a K dwarf star, and is the brightest best candidate
detected from MACHO. Results from the 2.2m MPG/ESO telescope and FEROS
(R=48,000) in May 2006 display an apparent radial velocity variation with
amplitude ~650m/s with the same period as the transit, and a solar-type
primary. This is consistent with an orbiting companion of mass ~4MJ. However,
further observations display an additional secondary long-period variation with
amplitude of several km/s, indicating the presence of a third body. The system
is likely a low mass eclipsing binary orbiting the solar-type primary. Further
observations are planned to fully characterize the system.

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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th