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Photometric colors of late-type giants: theory versus observations
A. Kucinskas, P. H. Hauschildt, H. -G. Ludwig +5
To assess the current status in the theoretical modeling of the spectral properties of late-type giants, we provide a comparison of synthetic photometric colors of late-type giants…
Convection and observable properties of late-type giants
A. Kucinskas, H. -G. Ludwig, P. H. Hauschildt
We show that contrary to what is expected from 1D stationary model atmospheres, 3D hydrodynamical modeling predicts a considerable influence of convection on the spectral propertie…
Type Ia Supernova Spectral Line Ratios as Luminosity Indicators
Sebastien Bongard, E. Baron, G. Smadja +2
Type Ia supernovae have played a crucial role in the discovery of the dark energy, via the measurement of their light curves and the determination of the peak brightness via fittin…
The low-mass companion of GQ Lup
E. W. Guenther, R. Neuhaeuser, G. Wuchterl +3
Using NACO on the VLT in the imaging mode we have detected an object at a distance of only 0.7 arcsec from GQ Lup. The object turns out to be co-moving. We have taken two K-band sp…
Broad-band photometric colors and effective temperature calibrations for late-type giants. I. Z=0.02
A. Kucinskas, P. H. Hauschildt, H. -G. Ludwig +5
We present new synthetic broad-band photometric colors for late-type giants based on synthetic spectra calculated with the PHOENIX model atmosphere code. The grid covers effective…
Quantitative Spectroscopy of Supernovae for Dark Energy Studies
E. Baron, David Branch, David Jeffery +6
Detailed quantitative spectroscopy of Type Ia supernovae (SNe~Ia) provides crucial information needed to minimize systematic effects in both ongoing SNe Ia observational programs s…
Review on low-mass stars and brown dwarfs
G. Chabrier, I. Baraffe, F. Allard +1
In this review, we examine the successes and weaknesses of modern low-mass star and brown dwarf theory.(1) We first focus on the mechanical (equation of state) and thermal (atmosph…
6^Li in the atmosphere of GJ 117
D. J. Christian, M. Mathioudakis, D. Jevremovic +2
We present high resolution VLT UVES observations of the active K dwarf GJ 117. 6^Li enhancement has been shown for energetic solar events, one chromospherically active binary, and…
Determination of stellar shape in microlensing event MOA 2002-BLG-33
N. J. Rattenbury, F. Abe, D. P. Bennett +30
We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directl…
Direct detection of exo-planets: GQ Lupi
Ralph Neuhaeuser, Eike Guenther, Peter Hauschildt
We present a comparison of our VLT/NACO K-band spectrum of the GQ Lupi companion with the new GAIA-dusty model atmosphere grid for T=2000 and 2900 K and log g from 0 to 4. Then, we…
PHOENIX model chromospheres of mid- to late-type M dwarfs
B. Fuhrmeister, J. H. M. M. Schmitt, P. H. Hauschildt
We present semi-empirical model chromospheres computed with the atmosphere code PHOENIX. The models are designed to fit the observed spectra of five mid- to late-type M dwarfs. Nex…
Hot-Jupiters and hot-Neptunes: a common origin?
I. Baraffe, G. Chabrier, T. S. Barman +3
We compare evolutionary models for close-in exoplanets coupling irradiation and evaporation due respectively to the thermal and high energy flux of the parent star with observation…
Evidence for a co-moving sub-stellar companion of GQ Lup
R. Neuhaeuser, E. W. Guenther, G. Wuchterl +3
We present a companion of the \le 2 Myr young classical T Tauri star GQ Lup in the Lupus star forming region at 140 \pm 50 pc from imaging, astrometry, and spectroscopy. With direc…
A Phoenix Modelatmosphere Grid For GAIA
I. Brott, P. H. Hauschildt
We present the results of a set of model atmospheres and synthetic spectra computed with the PHOENIX code. The models cover a range of effective temperatures 2700 K <= T_eff <= 10…
Theoretical modelling of late-type giant atmospheres: preparing for Gaia
A. Kucinskas, I. Brott, P. H. Hauschildt +4
Late type giants (RGB/AGB stars) will be important tracers of the Galactic morphology and evolution in the framework of Gaia, as they are intrinsically bright and thus can probe di…
Low Temperature Opacities
Jason W. Ferguson, David R. Alexander, France Allard +5
Previous computations of low temperature Rosseland and Planck mean opacities from Alexander & Ferguson (1994) are updated and expanded. The new computations include a more complete…
Modelling Alkali Line Absorption and Molecular Bands in Cool DAZs
Derek Homeier, Nicole F. Allard, France Allard +4
Two peculiar stars showing an apparent extremely broadened and strong NaI D absorption have been discovered in surveys for cool white dwarfs by Oppenheimer et al. (2001) and Harris…
Modeling CHANDRA Low Energy Transmission Grating Spectrometer Observations of Classical Novae with PHOENIX
Alexander Petz, Peter H. Hauschildt, Jan-Uwe Ness +1
We use the PHOENIX code package to model the X-ray spectrum of Nova V4743 Sagittarii observed with the LETGS onboard the Chandra satellite on 19 March 2003. To analyze nova atmosph…