On the star-magnetosphere interaction of close-in exoplanets

Wing Huen Ip, Andreas Kopp, Juei Hwa Hu

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Numerical simulations using a resistive MHD code are performed in order to investigate the interaction of the magnetospheres of hot Jupiters (or close-in extrasolar giant planets) with the central host stars. Because of the sub-Alfvénic nature of the stellar wind outflow at the orbital positions of these close-in exoplanets, no bow shock would form. When the orientation of the stellar coronal magnetic field is favorable to strong coupling with magnetic reconnection, the power (∼1027 ergs s-1) generated could reach the level of a typical solar flare. As a particular type of star-planet atmospheric interaction, as investigated by Cuntz, Saar, & Musielak, magnetospheric interaction as studied in this Letter could lead to extensive energy injection into the auroral zones of the exoplanets, producing massive atmospheric escape process as recently detected.

Original languageEnglish
Pages (from-to)L53-L56
JournalAstrophysical Journal
Issue number1 II
StatePublished - 10 Feb 2004


  • Magnetic fields
  • Planetary systems
  • Stars: atmospheres
  • Stars: chromospheres
  • Stars: flare


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