GMRT Observations of the Exoplanetary Systems τ Boötis and 55 Cancri

Abstract

Abstract We present archival Giant Metrewave Radio Telescope (GMRT) observations of two exoplanetary systems, τ Boötis, and 55 Cancri, at 610 MHz and 150 MHz, respectively. Theoretical models predict these systems to have some of the highest expected flux densities at radio wavelengths. Both τ Boötis and 55 Cancri have been previously observed at low frequency (∼30 MHz) with Low-Frequency Array. τ Boötis shows tentative signatures of circularly polarized emission at 30 MHz, while no emission was detected from 55 Cancri. We do not detect radio emission from both the systems, but the GMRT observations set 3σ upper limits of 0.6 mJy at 610 MHz for τ Boötis and 4.6 mJy at 150 MHz for 55 Cancri. The sensitivity achieved at 610 MHz in these observations is comparable to some of the deepest images of an exoplanet field.