Search Publications
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 …
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…
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…
PHANGS-JWST First Results: Massive Young Star Clusters and New Insights from JWST Observations of NGC 1365
White, Richard L.; Henshaw, Jonathan D.; Kruijssen, J. M. Diederik +28 more
A primary new capability of JWST is the ability to penetrate the dust in star-forming galaxies to identify and study the properties of young star clusters that remain embedded in dust and gas. In this Letter we combine new infrared images taken with JWST with our optical Hubble Space Telescope (HST) images of the starbursting barred (Seyfert2) spi…
Stellar Properties of Observed Stars Stripped in Binaries in the Magellanic Clouds
Smith, N.; Crowther, P. A.; de Mink, S. E. +6 more
Massive stars (~8-25 M ⊙) stripped of their hydrogen-rich envelopes via binary interaction are thought to be the main progenitors for merging neutron stars and stripped-envelope supernovae. We recently presented the discovery of the first set of such stripped stars in a companion paper. Here, we fit the spectra of 10 stars with new atmo…
The Puzzling Properties of the MACS1149-JD1 Galaxy at z = 9.11
Stiavelli, Massimo; Treu, Tommaso; Trenti, Michele +6 more
We analyze new JWST NIRCam and NIRSpec data on the redshift 9.11 galaxy MACS1149-JD1 (hereafter JD1). Our NIRCam imaging data reveal that JD1 comprises three spatially distinct components. Our spectroscopic data indicate that JD1 appears dust free but is already enriched, $12+\mathrm{log}({\rm{O}}/{\rm{H}})={7.90}_{-0.05}^{+0.04}$ . We also find t…
Using [Ne V]/[Ne III] to Understand the Nature of Extreme-ionization Galaxies
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +14 more
Spectroscopic studies of extreme-ionization galaxies (EIGs) are critical to our understanding of exotic systems throughout cosmic time. These EIGs exhibit spectral features requiring >54.42 eV photons: the energy needed to ionize helium into He2+ fully and emit He II recombination lines. Spectroscopic studies of EIGs can probe exotic…
The GLASS-JWST Early Release Science Program. II. Stage I Release of NIRCam Imaging and Catalogs in the Abell 2744 Region
Santini, Paola; Calabrò, Antonello; Castellano, Marco +27 more
We present images and a multiwavelength photometric catalog based on all of the JWST NIRCam observations obtained to date in the region of the Abell 2744 galaxy cluster. These data come from three different programs, namely, the GLASS-JWST Early Release Science Program, UNCOVER, and the Director's Discretionary Time program 2756. The observed area…
The Ages of Galactic Bulge Stars with Realistic Uncertainties
Rich, R. Michael; Johnson, Christian I.; Joyce, Meridith +3 more
Using modern isochrones with customized physics and carefully considered statistical techniques, we recompute the age distribution for a sample of 91 microlensed dwarfs in the Galactic bulge presented by Bensby et al. and do not produce an age distribution consistent with their results. In particular, our analysis finds that only 15 of 91 stars ha…
Potential Atmospheric Compositions of TRAPPIST-1 c Constrained by JWST/MIRI Observations at 15 µm
Kreidberg, Laura; Meadows, Victoria S.; Lincowski, Andrew P. +13 more
The first James Webb Space Telescope observations of TRAPPIST-1 c showed a secondary eclipse depth of 421 ± 94 ppm at 15 µm, which is consistent with a bare rock surface or a thin, O2-dominated, low-CO2 atmosphere. Here we further explore potential atmospheres for TRAPPIST-1 c by comparing the observed secondary eclipse…