English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We revisit the calculation of the Ohmic dissipation in a hot Jupiterpresented in Laine et al. (2008) by considering more realistic interiorstructures, stellar obliquity, and the resulting orbital evolution. In thissimplified approach, the young hot Jupiter of one Jupiter mass is modelled as adiamagnetic sphere with a finite resistivity, orbiting across tilted stellarmagnetic dipole fields in vacuum. Since the induced Ohmic dissipation occursmostly near the planet's surface, we find that the dissipation is unable tosignificantly expand the young hot Jupiter. Nevertheless, the planet inside asmall co-rotation orbital radius can undergo orbital decay by the dissipationtorque and finally overfill its Roche lobe during the T Tauri star phase. Thestellar obliquity can evolve significantly if the magnetic dipole isparallel/anti-parallel to the stellar spin. Our results are validated by thegeneral torque-dissipation relation in the presence of the stellar obliquity.We also run the fiducial model in Laine et al. (2008) and find that theplanet's radius is sustained at a nearly constant value by the Ohmic heating,rather than being thermally expanded to the Roche radius as suggested by theauthors.

astrophysical journal/the astrophysical journal

Coupled evolutions of the stellar obliquity, orbital distance, and  planet's radius due to the Ohmic dissipation induced in a diamagnetic hot  Jupiter around a magnetic T Tauri star