A search for cyclotron maser radiation from substellar and planet-like companions of nearby stars

Astronomy and Astrophysics – Astrophysics

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Companion Stars, Cyclotron Radiation, Interstellar Masers, Kepler Laws, Radio Spectra, Stellar Spectrophotometry, Emission Spectra

Scientific paper

Several stars within 5 pc have variations in their rectilinear or Keplerian motion that suggest that they have substellar or planetlike companions. However, direct, unambiguous evidence of such companions is difficult to obtain. It is argued that such objects should commonly emit cyclotron maser radiation and that this radiation should be observable with modern radio telescopes. Its detection would confirm the presence of the companions and permit many of the properties of the stars and companions to be derived. A search was made for the cyclotron maser emission from six nearby stars with suspected companions using the VLA at frequencies of 0.33 and 1.4 GHz. None was detected. Typical observing times were 3.5 hr, and typical upper limits were 30 mJy at 0.33 GHz and 0.3 mJy at 1.4 GHz.

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