JWST observations shed more light on the properties of a nearby brown dwarf arxiv
We observed HD 19467 B with JWST's
Cam in six filters spanning 2.5-4.6 $\mu m$ with the Long Wavelength Bar coronagraph. The brown dwarf HD 19467 B was initially identified through a long-period trend in the radial velocity of G3V star HD 19467. HD 19467 B was subsequently detected via coronagraphic imaging and spectroscopy, and characterized as a late-T type brown dwarf with approximate temperature $\sim1000$K.
Cam GTO science program, demonstrating the first use of the Cam Long Wavelength Bar coronagraphic mask. The object was detected in all 6 filters at a separation of 1.6 arcsec using Angular Differential Imaging and Synthetic Reference Differential Imaging . Due to a guidestar failure during acquisition of a pre-selected reference star, no reference star data was available for post-processing. However, RDI was successfully applied using synthetic Point Spread Functions developed from contemporaneous maps of the telescope's optical configuration.
Cam photometry, spectra and photometry from literature, and improved stellar parameters are used in conjunction with recent spectral and evolutionary substellar models to derive physical properties for HD 19467 B. Using an age of 9.4$\pm$0.9 Gyr inferred from spectroscopy, Gaia astrometry, and TESS asteroseismology, we obtain a model-derived mass of 62$\pm 1M_{J}$, which is consistent within 2-$\sigma$ with the dynamically derived mass of 81$^{+14}_{-12}M_{J}$.
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