5 papers
Interpretation of the Spectra Originating from the Photospheres Contaminated with Dust - Experience in L and T Dwarfs
Takashi Tsuji
Recent observations revealed that the infrared colors of L and T dwarfs show a large variation at a given T_ eff and this result may imply that the thickness of the dust cloud is c…
Spectral Classification Beyond M
S. K. Leggett, F. Allard, A. J. Burgasser +3
Significant populations of field L and T dwarfs are now known, and we anticipate the discovery of even cooler dwarfs by Spitzer and ground-based infrared surveys. However, as the n…
Water Observed in Red Giant and Supergiant Stars - Manifestation of a Novel Picture of the Stellar Atmosphere or else Evidence against the Classical Model Stellar Photosphere
Takashi Tsuji
We detected the H2O 6.3 micron bands in more than 30 normal red giants stars from K5III to M8III as well as in some early M supergiants on the SWS spectra retrieved from the ISO Da…
Unified Cloudy Models of L and T Dwarfs - Physical Basis of the Spectral Classification in the Substellar Regime
Takashi Tsuji
Based on a simple thermodynamical argument, we proposed a unified cloudy model (UCM) with a warm dust cloud deep in the photosphere. We showed, for the first time, that a single gr…
Unified Model Photospheres for Ultracool Dwarfs of the Types L and T
Takashi Tsuji
We show that the two groups of ultracool dwarfs classified as L and T types can be understood as a temperature effect in a unique sequence of the model photospheres in which dust a…