Search Publications
High atmospheric metal enrichment for a Saturn-mass planet
Stassun, Keivan G.; Mansfield, Megan; Bean, Jacob L. +9 more
Atmospheric metal enrichment (that is, elements heavier than helium, also called `metallicity') is a key diagnostic of the formation of giant planets1-3. The giant planets of the Solar System show an inverse relationship between mass and both their bulk metallicities and atmospheric metallicities. Extrasolar giant planets also display a…
The First JWST Spectral Energy Distribution of a Y Dwarf
Cushing, Michael C.; Kirkpatrick, J. Davy; Marley, Mark S. +3 more
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 rotatio…
Nitrogen-enriched, Highly Pressurized Nebular Clouds Surrounding a Super Star Cluster at Cosmic Noon
Pascale, Massimo; Dai, Liang; McKee, Christopher F. +1 more
Strong lensing offers a precious opportunity for studying the formation and early evolution of super star clusters that are rare in our cosmic backyard. The Sunburst Arc, a lensed Cosmic Noon galaxy, hosts a young super star cluster with escaping Lyman continuum radiation. Analyzing archival Hubble Space Telescope images and emission line data fro…
The Mass-Metallicity Relation of Dwarf Galaxies at Cosmic Noon from JWST Observations
Chevallard, Jacopo; Fan, Xiaohui; Cai, Zheng +13 more
We present a study of the mass-metallicity relation (MZR) of 51 dwarf galaxies (M ⋆ ≈ 106.5-109.5 M ⊙) at z = 2-3 from the A2744 and SMACS J0723-3732 galaxy cluster fields. These dwarf galaxies are identified and confirmed by deep JWST/NIRISS imaging and slitless grism spectroscopic observations. By taki…
Paschen-line Constraints on Dust Attenuation and Star Formation at z 1-3 with JWST/NIRSpec
Shapley, Alice E.; Reddy, Naveen A.; Sanders, Ryan L. +2 more
We use medium-resolution JWST/NIRSpec observations from the Cosmic Evolution Early Release Science Survey to place the first constraints on dust attenuation and star formation based on Paschen lines for a sizable sample of 63 galaxies at redshifts z = 1.0-3.1. Our analysis indicates strong correlations between the Balmer decrement, Hα/Hβ, and line…
JWST/MIRI Spectroscopy of the Disk of the Young Eruptive Star EX Lup in Quiescence
Banzatti, Andrea; Henning, Thomas; Bouwman, Jeroen +7 more
EX Lup is a low-mass pre-main-sequence star that occasionally shows accretion-related outbursts. Here, we present JWST/MIRI medium-resolution spectroscopy obtained for EX Lup 14 yr after its powerful outburst. EX Lup is now in quiescence and displays a Class II spectrum. We detect a forest of emission lines from molecules previously identified in …
The Cosmic Hunt for members in the outskirts of ultra-faint dwarf galaxies: Ursa Major I, Coma Berenices, and Boötes I
Sestito, Federico; Jensen, Jaclyn; McConnachie, Alan W. +6 more
Gaia EDR3 data were used to identify potential members in the outskirts of three ultra-faint dwarf (UFD) galaxies: Coma Berenices (>2Rh), Ursa Major I (~4Rh), and Boötes I (~4Rh), as well as a new member in the central region of Ursa Major I. These targets were observed with the Gemini GRACES spectrograph, which…
PHANGS-JWST First Results: Variations in PAH Fraction as a Function of ISM Phase and Metallicity
Kruijssen, J. M. Diederik; Leroy, Adam K.; Rosolowsky, Erik +26 more
We present maps tracing the fraction of dust in the form of polycyclic aromatic hydrocarbons (PAHs) in IC 5332, NGC 628, NGC 1365, and NGC 7496 from JWST/MIRI observations. We trace the PAH fraction by combining the F770W (7.7 µm) and F1130W (11.3 µm) filters to track ionized and neutral PAH emission, respectively, and comparing the PA…
Stellar halo substructure generated by bar resonances
Belokurov, Vasily; Evans, N. Wyn; Davies, Elliot Y. +1 more
Using data from the Gaia satellite's Radial Velocity Spectrometer Data Release 3 (RVS, DR3), we find a new and robust feature in the phase-space distribution of halo stars. It is a prominent ridge at constant energy and with angular momentum Lz > 0. We run test particle simulations of a stellar halo-like distribution of particles in …
Early Planet Formation in Embedded Disks (eDisk). II. Limited Dust Settling and Prominent Snow Surfaces in the Edge-on Class I Disk IRAS 04302+2247
Kwon, Woojin; Lai, Shih-Ping; Han, Ilseung +26 more
While dust disks around optically visible, Class II protostars are found to be vertically thin, when and how dust settles to the midplane are unclear. As part of the Atacama Large Millimeter/submillimeter Array large program, Early Planet Formation in Embedded Disks, we analyze the edge-on, embedded, Class I protostar IRAS 04302+2247, also nicknam…