2023ApJ...951L..48B

Query : 2023ApJ...951L..48B

2023ApJ...951L..48B - Astrophys. J., 951, L48 (2023/July-2)

The First JWST Spectral Energy Distribution of a Y Dwarf.

BEILER S.A., CUSHING M.C., KIRKPATRICK J.D., SCHNEIDER A.C., MUKHERJEE S. and MARLEY M.S.

Abstract (from CDS):

We present the first JWST spectral energy distribution of a Y dwarf. This spectral energy distribution of the Y0 dwarf WISE J035934.06-540154.6 consists of low-resolution (λ/Δλ ∼100) spectroscopy from 1-12 μm and three photometric points at 15, 18, and 21 μm. The spectrum exhibits numerous fundamental, overtone, and combination rotational-vibrational bands of H₂O, CH₄, CO, CO₂, and NH₃, including the previously unidentified ν₃ band of NH₃ at 3 μm. Using a Rayleigh-Jeans tail to account for the flux emerging at wavelengths greater than 21 μm, we measure a bolometric luminosity of 1.523 ± 0.090 × 10²⁰ W. We determine a semiempirical effective temperature estimate of ${467}_{-18}^{+16}$ K using the bolometric luminosity and evolutionary models to estimate a radius. Finally, we compare the spectrum and photometry to a grid of atmospheric models and find reasonably good agreement with a model having T_eff = 450 K, log g = 3.25 [cm s^–2], and [M/H] = -0.3. However, the low surface gravity implies an extremely low mass of 1 M_Jup and a very young age of 20 Myr, the latter of which is inconsistent with simulations of volume-limited samples of cool brown dwarfs.

Journal keyword(s): Brown dwarfs - Stellar effective temperatures - Y dwarfs - Near infrared astronomy - Spectroscopy

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	WISE J035934.06-540154.6	BD*	03 59 34.24998	-54 01 46.4287						Y0	43	0

Query : 2023ApJ...951L..48B

Basic data :

WISE J035934.06-540154.6 -- Brown Dwarf

BD* (2013ApJ), MIR (WISEA,WISE), * (CNS5)

03 59 34.24998 -54 01 46.4287 (Middle-IR) [ ] C 2021ApJS..253....7K

03 58 20.97705 -54 09 33.7388 [ ]

264.29717299 -46.49630153 [ ]

-134.1 -758.9 [0.7 0.9 90] C 2021ApJS..253....7K

73.6 [2.0] C 2021ApJS..253....7K

Y0 C 2012ApJ...753..156K

J 21.40 [0.09] C 2014ApJ...796...39T

H 21.72 [0.17] D 2017ApJ...842..118L

K 22.80 [0.30] D 2017ApJ...842..118L

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CNS5 994 WISEA J035934.07-540154.8 WISE J035934.06-540154.6

References (43 between 1850 and 2026) (Total 43)
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WISEA J035934.07-540154.8 WISE J035934.06-540154.6

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