Observations of transiting extra-solar planets provide rich sources of data for probing the in-system environment. In the WASP-12 system, a broad depression in the usually bright Mg II h&k lines has been observed, in addition to atmospheric escape from the extremely hot Jupiter WASP-12b. It has been hypothesized that a translucent circumstellar cloud is formed by the outflow from the planet, causing the observed signatures. We perform 3D hydrodynamic simulations of the full system environment of WASP-12, injecting a planetary wind and stellar wind from their respective surfaces. We find that a torus of density high enough to account for the lack of Mg II h&k line core emission in WASP-12 can be formed in approximately 13 yr. We also perform synthetic observations of the Lyman α spectrum at different points in the planet's orbit, which demonstrate that significant absorption occurs at all points in the orbit, not just during transits, as suggested by the observations.
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- August 2018
- planets and satellites: atmospheres;
- planet-star interactions;
- Astrophysics - Earth and Planetary Astrophysics