Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: GMRT search for 150 MHz radio emission from the transiting extrasolar
  planets HD189733b and HD209458b   We report a sensitive search for meter-wavelength emission at 150 MHz from
two prominent transiting extrasolar planets, HD189733b and HD209458b. To
distinguish any planetary emission from possible stellar or background
contributions, we monitored these systems just prior to, during, and after the
planet's eclipse behind the host star. No emission was detected from HD209458b
with a 3-sigma upper limit of 3.6 mJy. For HD189733b we obtain a 3-sigma upper
limit of 2.1 mJy and a marginal 2.7-sigma detection of about 1.9+/-0.7 mJy from
a direction just 13" from the star's coordinates (i.e., within the beam), but
its association with the planet remains unconfirmed. Thus, the present GMRT
observations provide unprecedentedly tight upper limits for meter wavelengths
emissions from these nearest two transiting type exoplanets. We point out
possible explanations of the non-detections and briefly discuss the resulting
constraints on these systems.

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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: atom-ph