Journal
ASTROPHYSICAL JOURNAL
Volume 820, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/0004-637X/820/2/122
Keywords
planetary systems; planets and satellites: individual (Jupiter); radio continuum: planetary systems; stars: AGB and post-AGB; stars: evolution; Sun: evolution
Categories
Funding
- Japan Society for the Promotion of Science [25887024]
- AMIAS group
- NASA [AR-12146.04-A]
- NSF [AST-1102738, 1352519, 1440343]
- National Research Council Research Associateship Award at the Naval Research Laboratory (NRL)
- NASA Postdoctoral Program at NASA Goddard Institute for Space Studies
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1352519] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1440343] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [25887024] Funding Source: KAKEN
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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, if planetary companions exist around these stars at orbital distances of a few au, they will be heated up to the level of canonical hot Jupiters and also be 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 an RGHJ may be detectable at distances up to a few hundred parsecs with the Square Kilometer Array.
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