Search Publications
Possible Carbon Dioxide above the Thick Aerosols of GJ 1214 b
Fortney, Jonathan J.; Wheatley, Peter J.; Henry, Gregory W. +14 more
Sub-Neptune planets with radii smaller than Neptune (3.9 R ⊕) are the most common type of planet known to exist in the Milky Way, even though they are absent in the solar system. These planets can potentially have a large diversity of compositions as a result of different mixtures of rocky material, icy material, and gas accreted from a…
Characterizing the Average Interstellar Medium Conditions of Galaxies at z ∼ 5.6–9 with Ultraviolet and Optical Nebular Lines
Papovich, Casey; Cole, Justin W.; Finkelstein, Steven L. +30 more
Ultraviolet (UV; rest-frame ∼1200–2000 Å) spectra provide a wealth of diagnostics to characterize fundamental galaxy properties, such as their chemical enrichment, the nature of their stellar populations, and their amount of Lyman-continuum (LyC) radiation. In this work, we leverage publicly released JWST data to construct the rest-frame UV-to-opt…
The Search for Failed Supernovae with the Large Binocular Telescope: The Mid-infrared Counterpart to N6946-BH1
Kochanek, Christopher S.; Neustadt, Jack M. M.; Stanek, Krzysztof Z.
We present JWST MIRI 5.6, 10, and 21 µm observations of the candidate failed supernova N6946-BH1 along with Hubble Space Telescope (HST) WFPC/IR 1.1 and 1.6 µm data and ongoing optical monitoring data with the Large Binocular Telescope. There is a very red, dusty source at the location of the candidate, which has only ∼10%–15% of the l…
A Census from JWST of Extreme Emission-line Galaxies Spanning the Epoch of Reionization in CEERS
Papovich, Casey; Finkelstein, Steven L.; Barro, Guillermo +30 more
We present a sample of 1165 extreme emission-line galaxies (EELGs) at 4 < z < 9 selected using James Webb Space Telescope (JWST) NIRCam photometry in the Cosmic Evolution Early Release Science (CEERS) program. We use a simple method to photometrically identify EELGs with Hβ + [O III] (combined) or Hα emission of observed-frame equivalent wid…
Primordial Black Holes in Scalar Field Inflation Coupled to the Gauss–Bonnet Term with Fractional Power-law Potentials
Ashrafzadeh, Ali; Karami, Kayoomars
In this study, we investigate the formation of primordial black holes (PBHs) in a scalar field inflationary model coupled to the Gauss–Bonnet term with fractional power-law potentials. The coupling function enhances the curvature perturbations, then results in the generation of PBHs and detectable secondary gravitational waves (GWs). We identify t…
The Next Generation Deep Extragalactic Exploratory Public Near-infrared Slitless Survey Epoch 1 (NGDEEP-NISS1): Extragalactic Star-formation and Active Galactic Nuclei at 0.5 < z < 3.6
Papovich, Casey; Finkelstein, Steven L.; Pérez-González, Pablo G. +48 more
The Next Generation Deep Extragalactic Exploratory Public (NGDEEP) survey program was designed specifically to include Near Infrared Slitless Spectroscopic observations (NGDEEP-NISS) to detect multiple emission lines in as many galaxies as possible and across a wide redshift range using the Near Infrared Imager and Slitless Spectrograph. We presen…
NICER Discovery that SRGA J144459.2–604207 Is an Accreting Millisecond X-Ray Pulsar
Chakrabarty, Deepto; Ray, Paul S.; Wolff, Michael T. +17 more
We present the discovery, with the Neutron Star Interior Composition Explorer (NICER), that SRGA J144459.2‑604207 is a 447.9 Hz accreting millisecond X-ray pulsar (AMXP), which underwent a 4 week long outburst starting on 2024 February 15. The AMXP resides in a 5.22 hr binary, orbiting a low-mass companion donor with M d > 0.1 M
Spectral Calculations of 3D Radiation Magnetohydrodynamic Simulations of Super-Eddington Accretion onto a Stellar-mass Black Hole
Middleton, Matthew J.; Mills, Brianna S.; Davis, Shane W. +1 more
We use the Athena++ Monte Carlo (MC) radiation transfer module to postprocess simulation snapshots from nonrelativistic Athena++ radiation magnetohydrodynamic (RMHD) simulations. These simulations were run using a gray (frequency-integrated) approach but were also restarted and ran with a multigroup approach that accounts for Compton scattering wi…
CEERS: 7.7 µm PAH Star Formation Rate Calibration with JWST MIRI
Papovich, Casey; Yang, Guang; Finkelstein, Steven L. +33 more
We test the relationship between UV-derived star formation rates (SFRs) and the 7.7 µm polycyclic aromatic hydrocarbon luminosities from the integrated emission of galaxies at z ∼ 0–2. We utilize multiband photometry covering 0.2–160 µm from the Hubble Space Telescope, CFHT, JWST, Spitzer, and Herschel for galaxies in the Cosmic Evolut…
On the Pair-instability Supernova Origin of J1010+2358
Aguado, David S.; Lucchesi, Romain; Amarsi, Anish M. +4 more
The first (Population III) stars formed only out of H and He and were likely more massive than present-day stars. Massive Population III stars in the range 140–260 M ⊙ are predicted to end their lives as pair-instability supernovae (PISNe), enriching the environment with a unique abundance pattern, with high ratios of odd to even elemen…