Best-fit Abundances, Observed Spectra and Spectral Models for the New Sample of Ultracool Dwarf Benchmarks with Detailed Chemical Characterization

Dataset associated with Fisher et al. 2024 in RNAAS [link to publication]

summary.mrt is a table of identifiers, photometry, fundamental stellar parameters and detailed chemical compositions for 13 candidate wide binary systems with FGK Main Sequence primaries (5100 K < Teff < 6300 K) and ultracool dwarf companions (2500 K < Teff < 3100 K). Refer to the file header for detailed description of columns and units.

stars.zip contains the high-resolution spectra of primaries observed with the Automated Planet Finder (APF, program 2021B_A010), as well as the corresponding best-fit spectral models. Each FITS file in the archive represents an individual exposure of the primary. The files are arranged in directories by identifiers of the primaries. The total number of exposures varies from source to source.

FITS files are composed of a primary HDU and 6 extensions.

The primary HDU contains the unmodified sky-subtracted spectrum of the object as produced by the APF pipeline and published on Jump. The spectrum is stored as a 2D array organized by Echelle orders.

The first extension contains the corresponding air wavelengths [in A] transformed to the rest frame of the source.

The second extension is the boolean mask of pixels included in model fitting.

The third extension is the adopted statistical weights of each pixel, estimated as inverse variances under the assumption of Poisson noise.

The fourth extension contains the best-fit synthetic spectrum in CGS units of surface intensity per wavelength in A.

The fifth extension is the best-fit spline continuum correction between the model and the data.

The final extension contains the adopted FWHM of the line spread function in each pixel, estimated by combining in quadrature a wavelength-dependent component with λ/Δλ=120,000 and a best-fit wavelength independent component (the quickblur parameter of the chemfit package)

This repository is for the research note "New Sample of Ultracool Dwarf Benchmarks with Detailed Chemical Characterization" by Fisher et al. It is associated with manuscript number AAS58102.