Planet-Induced Activity Enhancements in the HD 179949 System

Details Planet-Induced Activity Enhancements in the HD 179949 System Planet-Induced Activity Enhancements in the HD 179949 System

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1653s&link_type=abstract

Chandra Proposal ID #06200882

Physics

Chandra Proposal Id #06200882

Scientific paper

Many exoplanets are gas giants extremely close (<0.1 AU) to their parent stars, suggesting the possibility 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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