The broad line region and dust torus structure of the Seyfert 1 WPVS48
  Optical and near-mid-infrared reverberation mapping data obtained at
Universit\"{a}tssternwarte Bochum in Chile and with the Spitzer Space Telescope
allow us to explore the geometry of both the H$\alpha$ BLR and the dust torus
for the nearby Seyfert 1 galaxy WPVS\,48. On average, the H$\alpha$ variations
lag the blue AGN continuum by about 18 days, while the dust emission variations
lag by 70 days in the J+K and by 90 days in the L+M bands. The IR echoes are
sharp, while the H$\alpha$ echo is smeared. This together favours a bowl-shaped
toroidal geometry where the dust sublimation radius is defined by a bowl
surface, which is virtually aligned with a single iso-delay surface, thus
leading to the sharp IR echoes. The BLR clouds, however, are located inside the
bowl and spread over a range of iso-delay surfaces, leading to a smeared echo.
