First Observations of the Brown Dwarf HD 19467 B with JWST
Alexandra Z. Greenbaum, Jorge Llop-Sayson, Ben Lew, Geoffrey Bryden,, Thomas Roellig, Marie Ygouf, B.J. Fulton, Daniel R. Hey, Daniel Huber,, Sagnick Mukherjee, Michael Meyer, Jarron Leisenring, Marcia Rieke, Martha, Boyer, Joseph J. Green, Doug Kelly, Karl Misselt

TL;DR
This paper reports the first JWST observations of the brown dwarf HD 19467 B, demonstrating advanced imaging techniques and deriving its physical properties through combined observational and modeling approaches.
Contribution
It presents the first use of JWST's NIRCam Long Wavelength Bar coronagraphic mask to observe a brown dwarf and combines multiple data sources to characterize its properties.
Findings
Detected HD 19467 B in six filters with high contrast
Derived a mass estimate consistent with previous dynamical measurements
Demonstrated successful synthetic PSF RDI post-processing despite guidestar failure
Abstract
We observed HD 19467 B with JWST's NIRCam in six filters spanning 2.5-4.6 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 K. We observed HD 19467 B as a part of the NIRCam GTO science program, demonstrating the first use of the NIRCam Long Wavelength Bar coronagraphic mask. The object was detected in all 6 filters (contrast levels of to ) at a separation of 1.6 arcsec using Angular Differential Imaging (ADI) and Synthetic Reference Differential Imaging (SynRDI). Due to a guidestar failure during acquisition of a pre-selected reference star, no reference star data…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Adaptive optics and wavefront sensing
