Diversity of Cold Worlds: A Near Complete Spectral Energy Distribution for 2MASS J04151954-0935066 using JWST

Abstract

We present the a near complete spectral energy distribution (SED) for an extrasolar world: the T8 brown dwarf 2MASS~J04151954$-$0935066. Spanning from optical to mid-infrared (0.7--20.4 micron) wavelengths, the SED for this substellar atmosphere is constructed from new JWST NIRSpec G395H ($R\sim$2700) and Magellan FIRE echelle ($R\sim$8000) near-infrared spectra, along with MIRI mid-infrared photometry complemented by spectra from Keck I, IRTF, Magellan, AKARI, Spitzer and photometry from various surveys and missions. The NIRSpec G395H spectrum reveals strong molecular absorptions from NH${}_3$, CH${}_4$, H${}_2$S, CO${}_2$ and H${}_2$O at approximately 3.00, 3.35, 3.95, 4.25, and 5.00 micron respectively, along with the presence of a CO absorption feature detected mainly at $\sim$ 4.6 micron. We detect no absorption of near-infrared K I doublets in the $R\sim 8000$ FIRE spectra. In the mid-infrared IRS spectrum, we tentatively identify a new CO${}_2$ feature at 14--16 micron. The comprehensive SED allows us to empirically constrain bolometric luminosity, effective temperature, mass and radius. Additionally, we demonstrate that the NIRSpec G395H resolution, the highest allowable by JWST, enables a precise radial velocity measurement of $47.1\pm 1.8$ km s${}^{-1}$ for the object, in agreement with previous measurements.

arXiv comment13 pages, 6 figures, 3 tables. Accepted for publication in ApJ

References in corpus (50)

• The Sloan Digital Sky Survey: Technical Summary
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• The Infrared Spectrograph on the Spitzer Space Telescope
• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• The Infrared Astronomical Mission AKARI
• The UKIRT Infrared Deep Sky Survey ZYJHK Photometric System: Passbands and Synthetic Colours
• The Evolution of L and T Dwarfs in Color-Magnitude Diagrams
• ExoMol molecular line lists XXX: a complete high-accuracy line list for water
• The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition
• Near-Infrared Photometry and Spectroscopy of L and T Dwarfs: the Effects of Temperature, Clouds, and Gravity
• L' and M' Photometry of Ultracool Dwarfs
• Neglected Clouds in T and Y Dwarf Atmospheres
• ExoMol: molecular line lists for exoplanet and other atmospheres
• The Science Performance of JWST as Characterized in Commissioning
• Preliminary Parallaxes of 40 L and T Dwarfs from the U.S. Naval Observatory Infrared Astrometry Program
• The Spectra of T Dwarfs I: Near-Infrared Data and Spectral Classification
• The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)
• The Discovery of Y Dwarfs Using Data from the Wide-field Infrared Survey Explorer (WISE)
• Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime
• The 2MASS Wide-Field T Dwarf Search. III. Seven New T Dwarfs and Other Cool Dwarf Discoveries
• The CatWISE2020 Catalog
• Discoveries from a Near-infrared Proper Motion Survey using Multi-epoch 2MASS Data
• ExoMol molecular line lists XXXV: a rotation-vibration line list for hot ammonia
• An accurate, extensive, and practical line list of methane for the HITEMP database
• The Missing Link: Early Methane ("T") Dwarfs in the Sloan Digital Sky Survey
• Hubble Space Telescope NICMOS Observations of T Dwarfs: Brown Dwarf Multiplicity and New Probes of the L/T Transition
• A Method for Determining the Physical Properties of the Coldest Known Brown Dwarfs
• Spitzer/IRAC Photometry of M, L, and T Dwarfs
• ExoMol line lists VII: The rotation-vibration spectrum of phosphine up to 1500 K
• The Spectra of T Dwarfs. II. Red Optical Data
• The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems II: A 1 to 20 Micron Spectrum of the Planetary-Mass Companion VHS 1256-1257 b
• Preliminary Trigonometric Parallaxes of 184 Late-T and Y Dwarfs and an Analysis of the Field Substellar Mass Function into the "Planetary" Mass Regime
• Physical parameters of two very cool T dwarfs
• MASE: A New Data--Reduction Pipeline for the Magellan Echellette Spectrograph
• Physical and Spectral Characteristics of the T8 and Later-Type Dwarfs
• A Volume-Limited Sample of Ultracool Dwarfs. I. Construction, Space Density, and a Gap in the L/T Transition
• The Sonora Substellar Atmosphere Models. IV. Elf Owl: Atmospheric Mixing and Chemical Disequilibrium with Varying Metallicity and C/O Ratios
• Observations of Disequilibrium CO Chemistry in the Coldest Brown Dwarfs
• Ultracool Dwarfs Observed with the Spitzer Infrared Spectrograph. II. Emergence and Sedimentation of Silicate Clouds in L Dwarfs, and Analysis of the Full M5--T9 Field Dwarf Spectroscopic Sample
• AKARI Observations of Brown Dwarfs I.: CO and CO_2 Bands in the Near-Infrared Spectra
• A Survey for H-alpha Emission from Late L dwarfs and T dwarfs
• The Properties of the 500 K Dwarf UGPS J072227.51-054031.2, and a Study of the Far-Red Flux of Cold Brown Dwarfs
• Signatures of Cloud, Temperature, and Gravity From Spectra of the Closest Brown Dwarfs
• BANYAN. XII. New Members of Nearby Young Associations from Gaia-Tycho Data
• Probing the Extent of Vertical Mixing in Brown Dwarf Atmospheres with Disequilibrium Chemistry
• Self-consistent Models of Y Dwarf Atmospheres with Water Clouds and Disequilibrium Chemistry
• The First JWST Spectral Energy Distribution of a Y dwarf
• First T dwarfs in the VISTA Hemisphere Survey
• Ultracool Dwarfs Observed with the Spitzer Infrared Spectrograph. I. An Accurate Look at the L-to-T Transition at $\sim$300 Myr from Optical through Mid-infrared Spectrophotometry
• Following the Lithium: Tracing Li-bearing Molecules Across Age, Mass, and Gravity in Brown Dwarfs

Cited by in corpus (2)

• JWST high-contrast spectroscopy with speckle modelling: Atmospheric retrievals of the T dwarf companion HD 19467 B
• Panchromatic View of the Frigid Jovian Exoplanet COCONUTS-2 b