skip to main content

SciTech ConnectSciTech Connect

Title: RADIO EMISSION FROM RED-GIANT HOT JUPITERS

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8]
  1. Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo, 152-8550 (Japan)
  2. Analytics and Algorithms, Stitch Fix, San Francisco, CA 94103 (United States)
  3. Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC 20375 (United States)
  4. Department of Science and Mathematics, National Technical Institute for the Deaf, Rochester Institute of Technology, Rochester, NY 14623 (United States)
  5. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
  6. Astronomy Department, University of California, Berkeley, CA (United States)
  7. Astrophysics Department, Institute for Advanced Study, Princeton, NJ 08540 (United States)
  8. Astronomy Department, University of Cambridge (United Kingdom)
Publication Date:
OSTI Identifier:
22518530
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 820; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DISTANCE; JUPITER PLANET; MAGNETIC FIELDS; MASS; RADIOWAVE RADIATION; RED GIANT STARS; SATELLITES; STAR EVOLUTION; STELLAR WINDS; SUN