Search Publications
MIDIS: JWST/MIRI Reveals the Stellar Structure of ALMA-selected Galaxies in the Hubble Ultra Deep Field at Cosmic Noon
Henning, Thomas; Costantin, Luca; Boogaard, Leindert A. +30 more
We present deep James Webb Space Telescope (JWST)/Mid-Infrared Instrument (MIRI) F560W observations of a flux-limited, Atacama Large Millimeter/submillimeter Array (ALMA)-selected sample of 28 galaxies at z = 0.5–3.7 in the Hubble Ultra Deep Field (HUDF). The data from the MIRI Deep Imaging Survey (MIDIS) reveal the stellar structure of the HUDF g…
JWST COMPASS: NIRSpec/G395H Transmission Observations of the Super-Earth TOI-836b
Batalha, Natalie M.; Moran, Sarah E.; Kirk, James +13 more
We present two transit observations of the ∼870 K, 1.7 R ⊕ super-Earth TOI-836b with JWST NIRSpec/G395H, resulting in a 2.8–5.2 µm transmission spectrum. Using two different reduction pipelines, we obtain a median transit depth precision of 34 ppm for Visit 1 and 36 ppm for Visit 2, leading to a combined precision of 25 ppm in spe…
JWST MIRI flight performance: Imaging
Temim, Tea; Gordon, Karl D.; Law, David R. +37 more
The Mid-Infrared Instrument (MIRI) aboard the James Webb Space Telescope (JWST) provides the observatory with a huge advance in mid-infrared imaging and spectroscopy covering the wavelength range of 5-28 µm. This paper describes the performance and characteristics of the MIRI imager as understood during observatory commissioning activities, and th…
Measurement of D/H and 13C/12C ratios in methane ice on Eris and Makemake: Evidence for internal activity
Lunine, J. I.; Emery, J. P.; Hammel, H. B. +13 more
James Webb Space Telescope's NIRSpec infrared imaging spectrometer observed the outer solar system dwarf planets Eris and Makemake in reflected sunlight at wavelengths spanning 1 through 5 µm. Both objects have high albedo surfaces that are rich in methane ice, with a texture that permits long optical path lengths through the ice for solar p…
GRB 180128A: A second magnetar giant flare candidate from the Sculptor Galaxy
Andreoni, Igor; Frederiks, Dmitry D.; Svinkin, Dmitry S. +14 more
Magnetars are slowly rotating neutron stars that possess the strongest magnetic fields known in the cosmos (1014 − 1015 G). They display a range of transient high-energy electromagnetic activity. The brightest and most energetic of these events are the gamma-ray bursts (GRBs) known as magnetar giant flares (MGFs), with isotro…
Geometric distortion and astrometric calibration of the JWST MIRI Medium Resolution Spectrometer
Law, David R.; Álvarez-Márquez, Javier; Vandenbussche, Bart +13 more
Context. The Medium Resolution integral field Spectrometer (MRS) of the Mid-Infrared Instrument (MIRI) on board the James Webb Space Telescope (JWST) performs spectroscopy between 5 and 28 µm, with a field of view varying from ~13 to ~56 sq. arcsec. The optics of the MRS introduce substantial distortion and this needs to be rectified in order to r…
Large-scale Structures in COSMOS2020: Evolution of Star Formation Activity in Different Environments at 0.4 < z < 4
Casey, Caitlin M.; Kartaltepe, Jeyhan S.; Mobasher, Bahram +15 more
To study the role of environment in galaxy evolution, we reconstruct the underlying density field of galaxies based on COSMOS2020 (The Farmer catalog) and provide the density catalog for a magnitude-limited (K s < 24.5) sample of ∼210,000 galaxies at 0.4 < z < 5 within the COSMOS field. The environmental densities are calcula…
A Galactic Eclipse: The Small Magellanic Cloud Is Forming Stars in Two Superimposed Systems
Murray, Claire E.; Choi, Yumi; Lee, Min-Young +22 more
The structure and dynamics of the star-forming disk of the Small Magellanic Cloud (SMC) have long confounded us. The SMC is widely used as a prototype for galactic physics at low metallicity, and yet we fundamentally lack an understanding of the structure of its interstellar medium (ISM). In this work, we present a new model for the SMC by compari…
Are These Planets or Brown Dwarfs? Broadly Solar Compositions from High-resolution Atmospheric Retrievals of ∼10–30 M Jup Companions
Zhang, Yapeng; Fitzgerald, Michael P.; López, Ronald A. +32 more
Using Keck Planet Imager and Characterizer high-resolution (R ∼ 35,000) spectroscopy from 2.29 to 2.49 µm, we present uniform atmospheric retrievals for eight young substellar companions with masses of ∼10–30 M Jup, orbital separations spanning ∼50–360 au, and T eff between ∼1500 and 2600 K. We find that all companions …
The hierarchical formation of 30 Doradus as seen by JWST
Fahrion, Katja; De Marchi, Guido
The 30 Doradus region in the Large Magellanic Cloud (LMC) is the most energetic star-forming region in the Local Group. It is powered by the feedback from the massive stars in R 136, the 1-2 Myr old central massive cluster. 30 Doradus has therefore long been regarded as a laboratory for studying star and star cluster formation under conditions rem…