EC086
LSR J1835 follow-up observations
Previous EVN observations of a sample of Ultracool Dwarfs (EC067 and EC077) resulted in detection of radio emission in all objects proposed. One of them, LSR J1835+3259, shows a list of intriguing results: (i) in two of the three full rotations observed, a single LCP burst of radio emission is detected. (ii) These large pulses are preceded by a smaller RCP peak. (iii) The quiescent emission in epoch EC077 is detected as an extended structure which may be originated by energetic electrons trapped in radiation belts around LSRJ1835. (iv) The location of the bursting emission in this epoch reveals that the magnetosphere of LSRJ1835 appears to be asymmetric, or at least, to show an asymmetric radio activity. Although several scenarios are possible, these results are best explained by a star-planet interaction scenario where the companion will act as the source of plasma that can eventually produce both the gyrosynchrotron and pulsed emission detected. Our observations show the capacity of the EVN to significantly contribute to the study of the auroral emission in ultracool dwarfs. We request a new campaign of 5 GHz EVN observation to further explore the possible connection between auroras, exoplanets, and radiation belts in LSRJ1835.
Observation pages at the EVN archive:
This data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197