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We study mass transfer by Roche lobe overflow in close-in exoplanetarysystems. The planet's atmospheric gas passes through the inner Lagrangian pointand flows along a narrow stream, accelerating to 100-$200\kms$ velocity beforeforming an accretion disk. We show that the cylinder-shaped accretion streamcan have an area (projected in the plane of the sky) comparable to that of theplanet and a significant optical depth to spectral line absorption. Such a"transiting cylinder" may produce an earlier ingress of the planet transit, assuggested by recent HST observations of the WASP-12 system. The asymmetric diskproduced by the accretion stream may also lead to time-dependent obscuration ofthe star light and apparent earlier ingress. We also consider the interactionof the stellar wind with the planetary magnetosphere. Since the wind speed issubsonic/sub-Alfvenic and comparable to the orbital velocity of the planet, thehead of the magnetopause lies eastward relative to the substellar line (theline joining the planet and the star). The gas around the magnetopause may, ifsufficiently compressed, give rise to asymmetric ingress/egress during theplanet transit, although more works are needed to evaluate this possibility.

Mass Transfer, Transiting Stream and Magnetopause in Close-in Exoplanetary Systems with Applications to WASP-12