Radio Observations of HD 80606 Near Planetary Periastron
T. J.W. Lazio (1,5,6), P. D. Shankland (2), W. M. Farrell (3,5), D. L., Blank (4) ((1) NRL, (2) USNO, (3) NASA/GSFC, (4) James Cook, (5) NLSI, (6), now JPL)

TL;DR
This study used VLA radio observations to set limits on HD 80606b's magnetospheric emission near periastron, exploring its detectability with current and future low-frequency radio telescopes.
Contribution
First to provide radio flux density limits for HD 80606b at multiple frequencies during periastron, assessing its potential detectability with upcoming low-frequency radio arrays.
Findings
Flux density limits of 1.7 mJy at 325 MHz and 48 microJy at 1425 MHz.
Estimated planetary magnetospheric emission frequency around 60--90 MHz.
HD 80606b could be detectable with future low-frequency radio telescopes like SKA-lo.
Abstract
This paper reports Very Large Array observations at 325 and 1425 MHz (90cm and 20cm) during and near the periastron passage of HD 80606b on 2007 November 20. We obtain flux density limits (3-sigma) of 1.7 mJy and 48 microJy at 325 and 1425 MHz, respectively, equivalent to planetary luminosity limits of 2.3 x 10^{24} erg/s and 2.7 x 10^{23} erg/s. These are well above the Jovian value (at 40 MHz) of 2 x 10^{18} erg/s. The motivation for these observations was that the planetary magnetospheric emission is driven by a stellar wind-planetary magnetosphere interaction so that the planetary luminosity would be elevated. Near periastron, HD 80606b might be as much as 3000 times more luminous than Jupiter. Recent transit observations of HD 80606b provide stringent constraints on the planetary mass and radius, and, because of the planet's highly eccentric orbit, its rotation period is likely to…
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Taxonomy
TopicsAstro and Planetary Science · Stellar, planetary, and galactic studies · Pulsars and Gravitational Waves Research
