Planet-Induced Activity enhancements in the HD 179949 Systems

Details Planet-Induced Activity enhancements in the HD 179949 Systems Planet-Induced Activity enhancements in the HD 179949 Systems

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10355s&link_type=abstract

HST Proposal ID #10355

Physics

Hst Proposal Id #10355

Scientific paper

Many exoplanets are gas giants extremely close {<0.1 AU} to their parent stars, suggesting the posssiblitiy of exotic interactions. Recently, weakly enhanced Ca II HK emission was found in the HD 179949 system, phased to the orbital { 3 d} and not to the stellar rotation period { 8 d}. Theory suggests this enhancement is due to a magnetic interaction {MI} between the star and planet. Since the resulting heating should be largest in X-rays, we propose to study the system with Chandra to further characterize the MI. We will use HST to study the MI effect on the planet's ablating atmosphere by observing Doppler shifted H I around quadrature. These datasets will enable us to test interaction theories, and estimate exoplanetary magnetic fields, mass loss and stellar wind properties.

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