Methane emission from a cool brown dwarf

Copyright and License

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Acknowledgement

J.F. acknowledges the Heising Simons Foundation, the National Science Foundation (Award Nos. 2009177 and 1909776) and NASA (Award No. 80NSSC22K0142). B.B. acknowledges support from the UK Research and Innovation Science and Technology Facilities Council (Grant No. ST/X001091/1). J.M.V. acknowledges support from a university research fellowship funded by the Royal Society and Science Foundation Ireland (URF\1\221932). Portions of this research were carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA.

Contributions

J.K.F. oversaw all work including data reduction, analysis and modelling. B.B. completed the atmospheric retrieval. J.G. extracted the radial velocity of the source. G.S., J.M.V., S.A.M. and R.K. contributed to the SED analysis. C.V.M., B.L., M.R. and E.G.-N. contributed to the modelling analysis. D.C., J.D.K., A.M., A.C.S., M.J.K., D.C.B.G., C.B., P.E., C.R.G., E.G., F.M., A.J.R. and N.W. were all part of the original JWST GO programme 2124 proposal, which led to this data.

Data Availability

The JWST data in this paper are part of GO programme 2124 (principal investigator: J.K.F.) and are publicly available from MAST (archive.stsci.edu/) under that programme ID. The HST WFC3 spectrum of W2220 is available from ui.adsabs.harvard.edu/abs/2015ApJ...804...92S/abstract.

Extended Data Fig. 1 The Spitzer color-magnitude diagram for cold brown dwarfs.

Code Availability

The data reduction pipeline jwst can be found at jwst-pipeline.readthedocs.io/en/latest/. The Brewster code is open source and available at the following GitHub repository: github.com/substellar/brewster. Similarly, the SEDkit code is open source and available at github.com/hover2pi/sedkit. The set-up that yields the results presented herein is discussed in the Methods.

Conflict of Interest