Comparing Low- and High-Resolution Model Fits to T Dwarf Spectra

Details Comparing Low- and High-Resolution Model Fits to T Dwarf Spectra Comparing Low- and High-Resolution Model Fits to T Dwarf Spectra

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934526b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #345.26

Physics

Scientific paper

Brown dwarfs provide indispensable laboratories for studying the physics and chemistry of cool atmospheres in detail, and the understanding gained is directly applicable to gas giant exoplanets. Creating quality models for brown dwarf atmospheres is dependent on developing models for which the physical parameters inferred from best-fit spectra are consistent at all resolutions and across all wavelength regimes. For a sample of T dwarfs, we have begun to test the consistency of PHOENIX models by comparing best-fit parameters for low- and high-resolution near-infrared spectra. We fit low-resolution (Δλ ≈ 4 Å) SpeX Prism data from the NASA Infrared Telescope Facility Spectral Library and high-resolution (Δλ ≈ 0.625 Å) Keck/NIRSPEC data from the Brown Dwarf Spectroscopic Survey with PHOENIX cond (dust-free) model spectra calculated specifically for this project. The best-fit models for the high-resolution data were found using the MPFIT model fitting routine, while the best-fit models for the low-resolution data were found using a Markov Chain Monte Carlo routine. For twelve T dwarfs, the discrepancies between the low- and high-resolution best-fit effective temperature and surface gravity parameters are discussed. The low-resolution best-fit parameters are somewhat more consistent with expectations in effective temperature and are conclusively more consistent with expectations in surface gravity.

Affiliated with

Also associated with

No associations

Rating

Comparing Low- and High-Resolution Model Fits to T Dwarf Spectra does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Comparing Low- and High-Resolution Model Fits to T Dwarf Spectra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comparing Low- and High-Resolution Model Fits to T Dwarf Spectra will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1581729