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A 3D radiative transfer framework: VI. PHOENIX/3D example applications
Peter H. Hauschildt, E. Baron
We demonstrate the application of our 3D radiative transfer framework in the model atmosphere code PHOENIX/3D for a number of spectrum synthesis calculations for very different con…
On the Hydrogen Recombination Time in Type II Supernova Atmospheres
Soma De, E. Baron, P. H. Hauschildt
NLTE radiative transfer calculations of differentially expanding supernovae atmospheres are computationally intensive and are almost universally performed in time-independent snaps…
Comoving-frame radiative transfer in arbitrary velocity fields -- II. Large scale applications
S. Knop, P. H. Hauschildt, E. Baron
A solution of the radiative-transfer problem in arbitrary velocity fields introduced in a previous paper, has limitations in its applicability. For large-scale applications, the me…
3D Radiative Transfer with PHOENIX
E. Baron, Bin Chen, P. H. Hauschildt
Using the methods of general relativity Lindquist derived the radiative transfer equation that is correct to all orders in v/c. Mihalas developed a method of solution for the impor…
Dust in brown dwarfs and extra-solar planets II. Cloud formation for cosmologically evolving abundances
S. Witte, Ch. Helling, P. H. Hauschildt
Substellar objects have extremely long life-spans. The cosmological consequence for older objects are low abundances of heavy elements, which results in a wide distribution of obje…
Time-dependent radiative transfer with PHOENIX
D. Jack, P. H. Hauschildt, E. Baron
Aims. We present first results and tests of a time-dependent extension to the general purpose model atmosphere code PHOENIX. We aim to produce light curves and spectra of hydro mod…
Spectral synthesis of circumstellar disks - application to white dwarf debris disks
S. D. Huegelmeyer, S. Dreizler, D. Homeier +1
Gas and dust disks are common objects in the universe and can be found around various objects, e.g. young stars, cataclysmic variables, active galactic nuclei, or white dwarfs. The…
Physical parameters of T dwarfs derived from high-resolution near-infrared spectra
C. del Burgo, E. L. Martin, M. R. Zapatero Osorio +1
We determine the effective temperature, surface gravity and projected rotational velocity of nine T dwarfs from the comparison of high-resolution near-infrared spectra and syntheti…
A 3D radiative transfer framework: V. Homologous Flows
E. Baron, Peter H. Hauschildt, Bin Chen
Observations and theoretical calculations have shown the importance of non-spherically symmetric structures in supernovae. Thus, the interpretation of observed supernova spectra re…
Radiative transfer in circumstellar disks - I. 1D models for GQ Lupi
S. D. Huegelmeyer, S. Dreizler, P. H. Hauschildt +3
We present a new code for the calculation of the 1D structure and synthetic spectra of accretion disks. The code is an extension of the general purpose stellar atmosphere code PHOE…
A 3D radiative transfer framework: IV. spherical & cylindrical coordinate systems
Peter H. Hauschildt, E. Baron
We extend our framework for 3D radiative transfer calculations with a non-local operator splitting methods along (full) characteristics to spherical and cylindrical coordinate syst…
Optical and Near-Infrared Spectroscopy of the L Subdwarf SDSS J125637.13-022452.4
Adam J. Burgasser, Soeren Witte, Christiane Helling +3
Red optical and near-infrared spectroscopy are presented for SDSS J125637.13-022452.4, one of only four L subdwarfs reported to date. These data confirm the low-temperature, metal-…
A new formal solution of the radiative transfer in arbitrary velocity fields
S. Knop, P. H. Hauschildt, E. Baron
We present a new formal solution of the Lagrangian equation of radiative transfer that is useful in solving the equation of radiative transfer in the presence of arbitrary velocity…