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Determination of Primordial Metallicity and Mixing in the Type IIP Supernova 1993W
E. Baron, Peter E. Nugent, David Branch +3
We present the results of a large grid of synthetic spectra and compare them to early spectroscopic observations of SN 1993W. This supernova was discovered close to its explosion d…
The Extraordinary X-ray Light Curve of the Classical Nova V1494 Aquilae (1999 #2) in Outburst: The Discovery of Pulsations and a "Burst"
Jeremy J. Drake, R. Mark Wagner, Sumner Starrfield +12
V1494 Aql (Nova Aql 1999 No. 2) was discovered on 2 December 1999. We obtained Chandra ACIS-I spectra on 15 April and 7 June 2000 which appear to show only emission lines. Our thir…
Methane and the Spectra of T Dwarfs
Derek Homeier, Peter H. Hauschildt, France Allard
We have updated our PHOENIX model atmospheres and theoretical spectra for ultracool dwarfs with new opacity data for methane based on line strength predictions with the STDS softwa…
Highlights of Stellar Modeling with PHOENIX
E. Baron, Peter H. Hauschildt, F. Allard +4
We briefly describe the current version of the PHOENIX code. We then present some illustrative results from the modeling of Type Ia and Type II supernovae, hot stars, and irradiate…
Numerical simulations of surface convection in a late M-dwarf
H. -G. Ludwig, F. Allard, P. H. Hauschildt
Based on detailed 2D and 3D numerical radiation-hydrodynamics (RHD) simulations of time-dependent compressible convection, we have studied the dynamics and thermal structure of the…
Model atmosphere analyses of post-common envelope stars
Mark T. Rushton, Barry Smalley, Richard N. Ogley +3
Understanding post-common-envelope evolution is important in the studies of close-binary systems. The majority of all interacting binaries with a compact object in their system (e.…
Detectibility of Hydrogen Mixing in Type Ia Supernova pre-Maximum Spectra
Eric J. Lentz, E. Baron, Peter H. Hauschildt +1
The presence of a small amount of hydrogen is expected in most single degenerate scenarios for producing a Type Ia supernova (SN Ia). While hydrogen may be detected in very early h…
Spectral Types of Planetary Host Star Candidates: Two New Transiting Planets?
S. Dreizler, T. Rauch, P. Hauschildt +3
Recently, 46 low-luminosity object transits were reported from the Optical Gravitational Lensing Experiment. Our follow-up spectroscopy of the 16 most promising candidates provides…
Parallelization Strategies for ALI Radiative Transfer in Moving Media
E. Baron, P. H. Hauschildt, D. Lowenthal
We describe the method we have used to parallelize our spherically symmetric special relativistic short characteristics general radiative transfer code PHOENIX. We describe some po…
Detailed Spectroscopic Analysis of SN 1987A: The Distance to the LMC using the SEAM method
Robert C. Mitchell, E. Baron, David Branch +5
Supernova 1987A remains the most well-studied supernova to date. Observations produced excellent broad-band photometric and spectroscopic coverage over a wide wavelength range at a…
Non-LTE Effects of Na I in the Atmosphere of HD209458b
Travis S. Barman, Peter H. Hauschildt, Andreas Schweitzer +3
The recent announcement that sodium absorption has been observed in the atmosphere of HD209458b, the only EGP observed to transit its parent star, is the first direct detection of…
The Spectral Energy Distribution and Mass-loss Rate of the A-Type Supergiant Deneb
J. P. Aufdenberg, P. H. Hauschildt, E. Baron +5
A stellar wind module has been developed for the PHOENIX stellar atmosphere code for the purpose of computing non-LTE, line-blanketed, expanding atmospheric structures and detailed…