@article{d81e7e85988e455985eb501c15a6566f,
title = "First Observations of the Brown Dwarf HD 19467 B with JWST",
abstract = "We observed HD 19467 B with JWST{\textquoteright}s NIRCam in six filters spanning 2.5-4.6 μm 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 the 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 an approximate temperature ∼1000 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 six filters (contrast levels of 2 × 10−4 to 2 × 10−5) at a separation of 1.″6 using angular differential imaging and synthetic reference differential imaging. Due to a guide star failure during the acquisition of a preselected reference star, no reference star data were available for post-processing. However, reference differential imaging was successfully applied using synthetic point-spread functions developed from contemporaneous maps of the telescope{\textquoteright}s optical configuration. Additional radial velocity data (from Keck/HIRES) are used to constrain the orbit of HD 19467 B. Photometric data from TESS are used to constrain the properties of the host star, particularly its age. NIRCam photometry, spectra, and photometry from the literature, and improved stellar parameters are used in conjunction with recent spectral and evolutionary substellar models to derive the physical properties of HD 19467 B. Using an age of 9.4 ± 0.9",
author = "Greenbaum, {Alexandra Z.} and Jorge Llop-Sayson and Lew, {Ben W.P.} and Geoffrey Bryden and Roellig, {Thomas L.} and Marie Ygouf and Fulton, {B. J.} and Hey, {Daniel R.} and Daniel Huber and Sagnick Mukherjee and Michael Meyer and Jarron Leisenring and Marcia Rieke and Martha Boyer and Green, {Joseph J.} and Doug Kelly and Karl Misselt and Eugene Serabyn and John Stansberry and Chu, {Laurie E.U.} and {De Furio}, Matthew and Doug Johnstone and Schlieder, {Joshua E.} and Charles Beichman",
note = "Funding Information: Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. Funding Information: The authors acknowledge this work was authored by employees of Caltech/IPAC under contract 80GSFC22CA003 with the the National Aeronautics and Space Administration. Some of the research described in this publication was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004). T.L.R acknowledges support from the NASA Science Mission Directorate under WBS 411672.05.05.02.01. D.J. is supported by NRC Canada and by an NSERC Discovery Grant. L.E.U.C.{\textquoteright}s research was supported by an appointment to the NASA Postdoctoral Program at the NASA Ames Research Center, administered by Oak Ridge Associated Universities under contract with NASA. D.R.H. and D.H. acknowledge support from the Research Corporation for Science Advancement (Scialog award #26996) and the National Science Foundation (AST-2009828). D.H. also acknowledges support from the Alfred P. Sloan Foundation and the National Aeronautics and Space Administration (80NSSC21K0652,80NSSC22K0303). Publisher Copyright: {\textcopyright} 2023. The Author(s). Published by the American Astronomical Society.",
year = "2023",
month = mar,
day = "1",
doi = "10.3847/1538-4357/acb68b",
language = "English (US)",
volume = "945",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",
}