MASS TRANSFER, TRANSITING STREAM, AND MAGNETOPAUSE IN CLOSE-IN EXOPLANETARY SYSTEMS WITH APPLICATIONS TO WASP-12

摘要: We study mass transfer by Roche lobe overflow in close-in exoplanetary systems. The planet's atmospheric gas passes through the inner Lagrangian point and flows along a narrow stream, accelerating to 100-200 km s{sup -1} velocity before forming an accretion disk. show that cylinder-shaped stream can have area (projected plane of sky) comparable planet significant optical depth spectral line absorption. Such 'transiting cylinder' may produce earlier ingress transit, as suggested recent Hubble Space Telescope observations WASP-12 system. asymmetric disk produced also lead time-dependent obscuration starlight apparent ingress. consider interaction stellar wind with planetary magnetosphere. Since speed is subsonic/sub-Alfvenic orbital planet, head magnetopause lies eastward relative substellar (the joining star). around may, if sufficiently compressed, give rise ingress/egress during although more works are needed evaluate this possibility.