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Detection of radio emission from exoplanets can provide information on thestar-planet system that is difficult to study otherwise, such as the planetarymagnetic field, magnetosphere, rotation period, interior structure, atmosphericdynamics and escape, and any star-planet interactions. Such a detection in theradio domain would open up a whole new field in the study of exoplanets.However, currently there are no confirmed detections of an exoplanet at radiofrequencies. In this study, we search for non-thermal radio emission from the55 Cnc system which has 5 known exoplanets. According to theoreticalpredictions 55 Cnc e, the innermost planet, is among the best targets for thissearch. We observed for 18 hours with the Low-Frequency Array (LOFAR) Low BandAntenna in the frequency range 26-73 MHz with full-polarization and covered 85%of the orbital phase of 55 Cnc e. During the observations four digital beamswithin the station beam were recorded simultaneously on 55 Cnc, nearby "empty"sky, a bright radio source, and a pulsar. A pipeline was created toautomatically find and mask radio frequency interference, calibrate thetime-frequency response of the telescope, and to search for bursty planetaryradio signals in our data. Extensive tests and verifications were carried outon the pipeline. Analysis of the first 4 hours of these observations do notcontain any exoplanet signal from 55 Cnc but we can confirm that our setup isadequate to detect faint astrophysical signals. We find a 3$\sigma$ upper limitfor 55 Cnc of 230 mJy using the pulsar to estimate the sensitivity of theobservations and 2.6 Jy using the time-series difference between the target andsky beam. The full data set is still under-going analysis. In the near futurewe will apply our observational technique and pipeline to the most promisingexoplanet candidates for which LOFAR observations have already been obtained.

earth and planetary astrophysics

The search for radio emission from exoplanets using LOFAR low-frequency  beam-formed observations: Data pipeline and preliminary results for the 55  Cnc system