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26 April 2024 |
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A search for circularly polarised emission from young exoplanets | | C. R. Lynch
; Tara Murphy
; D. L. Kaplan
; M. Ireland
; M. E. Bell
; | | Date: |
7 Feb 2017 | | Abstract: | We report the results of a 154 MHz survey to search for emission from
exoplanets located in the Upper Scorpius subgroup of the Sco Cen OB2
Association, the closest substantial region of recent star formation. This
survey is different from previous efforts in that it is the first to target
exoplanets orbiting Myr-old stars. Young exoplanet systems are expected to be
the best candidates for radio detections given the higher magnetic field
strengths predicted for young planets as well as the stronger and more dense
stellar wind expected for the host stars. The radio emission from exoplanets is
expected to be highly circularly polarised therefore we restricted our search
to the circular polarisation images rather than the total intensity images. We
carried out two different search methods using this data. The first method was
a targeted search for exoplanet emission using catalogues of known stars and
Hot Jupiters within the Upper Scorpius field. The second search method was a
blind search for highly circularly polarised sources in the field and for
sources identified only in our polarisation images. Both the blind and targeted
search resulted in non-detections with typical 3-sigma flux density limits of
4--235 mJy over timescales of 1.87--1000 minutes. In particular, we place the
first limits on low-frequency emission from the Hot Jupiter systems WASP-17 b
and K2-33 b. These are the first results from a larger program to
systematically search for low-frequency radio emission from planets orbiting
young stars. | | Source: | arXiv, 1702.1826 | | Services: | Forum | Review | PDF | Favorites | |
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