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JWST/NIRISS Reveals the Water-rich "Steam World" Atmosphere of GJ 9827 d
Fortney, Jonathan J.; MacDonald, Ryan J.; Knutson, Heather A. +30 more
With sizable volatile envelopes but smaller radii than the solar system ice giants, sub-Neptunes have been revealed as one of the most common types of planet in the galaxy. While the spectroscopic characterization of larger sub-Neptunes (2.5–4 R ⊕) has revealed hydrogen-dominated atmospheres, smaller sub-Neptunes (1.6–2.5 R ⊕…
A 1.9 solar-mass neutron star candidate in a 2-year orbit
Bieryla, Allyson; Latham, David W.; Rix, Hans-Walter +10 more
We report discovery and characterization of a main-sequence G star orbiting a dark object with mass 1.90±0.04M⊙. The system was discovered via Gaia astrometry and has an orbital period of 731 days. We obtained multi-epoch RV follow-up over a period of 639 days, allowing us to refine the Gaia orbital solution and precisely constrain the masses of b…
CEERS Key Paper. VIII. Emission-line Ratios from NIRSpec and NIRCam Wide-Field Slitless Spectroscopy at z > 2
Papovich, Casey; Yang, Guang; Finkelstein, Steven L. +37 more
We use James Webb Space Telescope Near-Infrared Camera Wide Field Slitless Spectroscopy (NIRCam WFSS) and the Near-Infrared spectrograph (NIRSpec) in the Cosmic Evolution Early Release survey to measure rest-frame optical emission-line ratios of 155 galaxies at z > 2. The blind NIRCam grism observations include a sample of galaxies with bright …
Discovery of a Collimated Jet from the Low-luminosity Protostar IRAS 16253‑2429 in a Quiescent Accretion Phase with the JWST
Manoj, P.; Narang, Mayank; Bourke, Tyler L. +36 more
Investigating Protostellar Accretion (IPA) is a JWST Cycle 1 GO program that uses NIRSpec integral field units and MIRI Medium Resolution Spectrograph to obtain 2.9–28 µm spectral cubes of young, deeply embedded protostars with luminosities of 0.2–10,000 L ⊙ and central masses of 0.15–12 M ⊙. In this Letter, we report t…
Statistical analysis of the gravitational anomaly in Gaia wide binaries
Hernandez, X.; Aguayo-Ortiz, A.; Verteletskyi, V. +1 more
The exploration of the low acceleration a < a0 regime, where a0 = 1.2 × 10-10 m s-2 is the acceleration scale of MOND around which gravitational anomalies at galactic scale appear, has recently been extended to the much smaller mass and length scales of local wide binaries thanks to the availability o…
GA-NIFS: NIRSpec reveals evidence for non-circular motions and AGN feedback in GN20
Charlot, Stéphane; Parlanti, Eleonora; Carniani, Stefano +15 more
We present rest-frame optical data of the
Spectroscopic sizing of interstellar icy grains with JWST
Rocha, W. R. M.; Melnick, G. J.; Boogert, A. C. A. +22 more
Clouds of gas and dust in the Galaxy are nurseries in which stars and planetary systems are born. During their journey from the diffuse interstellar medium to the protoplanetary disks, molecular solids accumulate on cold dust grains by accretion and surface chemistry. These so-called icy grains will continuously evolve, notably by collision and ag…
Sustained super-Eddington accretion in high-redshift quasars
Lupi, Alessandro; Volonteri, Marta; Colpi, Monica +2 more
Observations of z ≳ 6 quasars provide information on the early evolution of the most massive black holes (MBHs) and galaxies. Current observations, able to trace both gas and stellar properties, reveal a population of MBHs that is significantly more massive than expected from the local MBH-stellar mass relation. The population lies on, but mostly …
The ALMA REBELS survey: obscured star formation in massive Lyman-break galaxies at z= 4-8 revealed by the IRX-β and M⋆ relations
Inami, H.; Bowler, R. A. A.; Cullen, F. +23 more
We investigate the degree of dust obscured star formation in 49 massive (log10(M⋆/M⊙) > 9) Lyman-break galaxies (LBGs) at z = 6.5-8 observed as part of the Atacama Large Millimeter/submillimeter Array (ALMA) Reionization Era Bright Emission Line Survey (REBELS) large program. By creating deep stacks of the photo…
JADES: Balmer decrement measurements at redshifts 4 < z < 7
Chevallard, Jacopo; Carniani, Stefano; Übler, Hannah +33 more
We present Balmer decrement, Hα/Hβ, measurements for a sample of 51 galaxies at redshifts z = 4 ‑ 7 observed with the JWST/NIRSpec micro-shutter assembly (MSA), as part of the JWST Advanced Deep Extragalactic Survey (JADES). Leveraging 28-hour long exposures and the efficiency of the prism/clear configuration (but also using information from the m…