Search Publications
Evidence for a Shallow Evolution in the Volume Densities of Massive Galaxies at z = 4–8 from CEERS
Papovich, Casey; Cole, Justin W.; Yang, Guang +36 more
We analyze the evolution of massive (log10[M ⋆/M ⊙] > 10) galaxies at z ∼ 1–4 selected from JWST Cosmic Evolution Early Release Survey (CEERS). We infer the physical properties of all galaxies in the CEERS NIRCam imaging through spectral energy distribution (SED) fitting with dense basis to select a sample of hi…
JWST/NIRCam Transmission Spectroscopy of the Nearby Sub-Earth GJ 341b
Sing, David K.; Lustig-Yaeger, Jacob; Fu, Guangwei +17 more
We present a JWST/Near Infrared Camera (NIRCam) transmission spectrum from 3.9 to 5.0 µm of the recently validated sub-Earth GJ 341b (R P = 0.92 R ⊕, T eq = 540 K) orbiting a nearby bright M1 star (d = 10.4 pc, K mag = 5.6). We use three independent pipelines to reduce the data from the three JWST …
A Combined Ground-based and JWST Atmospheric Retrieval Analysis: Both IGRINS and NIRSpec Agree that the Atmosphere of WASP-77A b Is Metal-poor
Brogi, Matteo; Kempton, Eliza; Line, Michael R. +12 more
Ground-based high-resolution and space-based low-resolution spectroscopy are the two main avenues through which transiting exoplanet atmospheres are studied. Both methods provide unique strengths and shortcomings, and combining the two can be a powerful probe into an exoplanet's atmosphere. Within a joint atmospheric retrieval framework, we combin…
JWST COMPASS: A NIRSpec/G395H Transmission Spectrum of the Sub-Neptune TOI-836c
Batalha, Natalie M.; Moran, Sarah E.; Kirk, James +13 more
Planets between the sizes of Earth and Neptune are the most common in the Galaxy, bridging the gap between the terrestrial and giant planets in our solar system. Now that we are firmly in the era of JWST, we can begin to measure, in more detail, the atmospheres of these ubiquitous planets to better understand their evolutionary trajectories. The t…
JWST-TST High Contrast: Achieving Direct Spectroscopy of Faint Substellar Companions Next to Bright Stars with the NIRSpec Integral Field Unit
Anderson, Jay; Wakeford, Hannah R.; van der Marel, Roeland P. +33 more
The JWST NIRSpec integral field unit (IFU) presents a unique opportunity to observe directly imaged exoplanets from 3 to 5 µm at moderate spectral resolution (R ∼ 2700) and thereby better constrain the composition, disequilibrium chemistry, and cloud properties of their atmospheres. In this work, we present the first NIRSpec IFU high-contras…
JWST Imaging of Edge-on Protoplanetary Disks. I. Fully Vertically Mixed 10 µm Grains in the Outer Regions of a 1000 au Disk
Duchêne, Gaspard; Wolff, Schuyler G.; Perrin, Marshall D. +6 more
Scattered light imaging of protoplanetary disks provides key insights on the geometry and dust properties in the disk surface. Here, we present James Webb Space Telescope (JWST) 2–21 µm images of a 1000 au radius edge-on protoplanetary disk surrounding an 0.4 M ⊙ young star in Taurus, Two Micron All Sky Survey (2MASS) J04202144 + …
JWST-TST High Contrast: Asymmetries, Dust Populations, and Hints of a Collision in the β Pictoris Disk with NIRCam and MIRI
Stark, Christopher C.; Valenti, Jeff A.; van der Marel, Roeland P. +21 more
We present the first JWST Mid-Infrared Instrument (MIRI) and Near Infrared Camera (NIRCam) observations of the prominent debris disk around β Pictoris. Coronagraphic observations in eight filters spanning from 1.8 to 23 µm provide an unprecedentedly clear view of the disk at these wavelengths. The objectives of the observing program were to …
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/NIRSpec Observations of the Coldest Known Brown Dwarf
Luhman, K. L.; Birkmann, S. M.; Tremblin, P. +6 more
We present 1-5 µm spectroscopy of the coldest known brown dwarf, WISE J085510.83-071442.5 (WISE 0855), performed with the Near-Infrared Spectrograph (NIRSpec) on board the James Webb Space Telescope (JWST). NIRSpec has dramatically improved the measurement of the spectral energy distribution (SED) of WISE 0855 in terms of wavelength coverage…
Multiple Clues for Dayside Aerosols and Temperature Gradients in WASP-69 b from a Panchromatic JWST Emission Spectrum
Fortney, Jonathan J.; Moran, Sarah E.; Bell, Taylor J. +16 more
WASP-69 b is a hot, inflated, Saturn-mass planet (0.26 M Jup) with a zero-albedo equilibrium temperature of 963 K. Here, we report the JWST 2–12 µm emission spectrum of the planet consisting of two eclipses observed with NIRCam grism time series and one eclipse observed with the MIRI low-resolution spectrometer (LRS). The emission…