Tsutomu Aoki

TL;DR: In this article, the authors present the results of a dust reverberation survey for 17 nearby Seyfert 1 galaxies, which provides the largest homogeneous data collection for the radius of the innermost dust torus.

TL;DR: In this paper, a correlation between the optical luminosity of an active galactic nucleus (AGN) and the lag time between the UV/optical and the near-infrared light curves is presented for NGC 4151 in combination with previous lag-time measurements of other AGNs in the literature.

TL;DR: In this article, the photometric evolution is faster than in the well-known "hypernovae" SNe 1998bw and 1997ef, indicating that SN 2002ap ejected less mass.

TL;DR: In this article, the most extensive observations of the Seyfert 1 galaxies were carried out by the MAGNUM telescope, and clear time delayed responses of the K-band and V-band variations were found for all the galaxies.

TL;DR: In this paper, the authors measured a lag time Δt for eight separate periods and found that Δt is not constant, changing between 30 and 70 d during the monitoring period, which is the first convincing evidence that the inner radius of the dust torus did change in an individual AGN.