Victor Herrero Radio Astronomy Blog: January 2016

Friday, January 29, 2016

Sun Earth Jupiter 20160129

Many thanks to: STEREO and WIND Teams, Taxpayers of France, French Air Force, Nancay Decametric Array Team at the Nancay Radio Astronomy Station of Paris Observatory, Prof. Dr. Kazumasa Imai Kochi National College of Technology Kochi Japan, Trinity College Dublin Ireland Astrophysics Group, United States NOAA SWPC, NASA Solar Dynamics Observatory Teams, Lockheed Martin Solar Laboratory
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Links to earlier posts by month:

http://herrero-radio-astronomy.blogspot.com/2015/08/links-to-monthly-sun-earth-jupiter-posts.html?m=1

.Sun Earth Jupiter.

Saturday, January 23, 2016

Sun Earth Jupiter 20160122

Links to earlier posts by month:

http://herrero-radio-astronomy.blogspot.com/2015/08/links-to-monthly-sun-earth-jupiter-posts.html?m=1

.Sun Earth Jupiter.

Friday, January 22, 2016

Detection possibilities of "Hot Jupiter" planets orbiting red giant stars, with very large radio telescope arrays

With many thanks, I refer to Fujii at al., 2016:

"Radio Emission from Red-Giant Hot Jupiters"

http://arxiv.org/abs/1601.05428

http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1601.05428

Abstract: "When planet-hosting stars evolve off the main sequence and go through the red-giant branch, the stars become orders of magnitudes more luminous and at the same time lose mass at much higher rates than their main-sequence counterparts. Accordingly, planetary companions around them at orbital distances of a few AU, if they exist, will be heated up to the level of canonical hot Jupiters and also subjected to a dense stellar wind. Given that magnetized planets interacting with stellar winds emit radio waves, such "Red-Giant Hot Jupiters" (RGHJs) may also be candidate radio emitters. We estimate the spectral auroral radio intensity of RGHJs based on the empirical relation with the stellar wind as well as a proposed scaling for planetary magnetic fields. RGHJs might be intrinsically as bright as or brighter than canonical hot Jupiters, and about 100 times brighter than equivalent objects around main-sequence stars. We examine the capabilities of low-frequency radio observatories to detect this emission and find that the signal from a RGHJ may be detectable at distances up to a few hundred parsecs with the Square Kilometer Array."

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