Search Publications
The MUSCLES Treasury Survey. III. X-Ray to Infrared Spectra of 11 M and K Stars Hosting Planets
Redfield, Seth; Brown, Alexander; France, Kevin +8 more
We present a catalog of panchromatic spectral energy distributions (SEDs) for 7 M and 4 K dwarf stars that span X-ray to infrared wavelengths (5 Å -5.5 µm). These SEDs are composites of Chandra or XMM-Newton data from 5-∼50 Å, a plasma emission model from ∼50-100 Å, broadband empirical estimates from 100-1170 Å, Hubble Space Telescope data f…
The Influence of Nonuniform Cloud Cover on Transit Transmission Spectra
Line, Michael R.; Parmentier, Vivien
We model the impact of nonuniform cloud cover on transit transmission spectra. Patchy clouds exist in nearly every solar system atmosphere, brown dwarfs, and transiting exoplanets. Our major findings suggest that fractional cloud coverage can exactly mimic high mean molecular weight atmospheres and vice versa over certain wavelength regions, in pa…
Hubble Imaging of the Ionizing Radiation from a Star-forming Galaxy at Z=3.2 with fesc>50%
Giavalisco, M.; Castellano, M.; Pentericci, L. +20 more
Star-forming galaxies are considered to be the leading candidate sources dominating cosmic reionization at z\gt 7: the search for analogs at moderate redshift showing Lyman continuum (LyC) leakage is currently an active line of research. We have observed a star-forming galaxy at z = 3.2 with Hubble/WFC3 in the F336W filter, corresponding to the 73…
An HST/COS Survey of the Low-redshift Intergalactic Medium. I. Survey, Methodology, and Overall Results
Savage, Blair D.; Shull, J. Michael; Danforth, Charles W. +12 more
We use high-quality, medium-resolution Hubble Space Telescope/Cosmic Origins Spectrograph (HST/COS) observations of 82 UV-bright active galactic nuclei (AGNs) at redshifts zAGN < 0.85 to construct the largest survey of the low-redshift intergalactic medium (IGM) to date: 5138 individual extragalactic absorption lines in H I and 25 di…
Detection of H2O and Evidence for TiO/VO in an Ultra-hot Exoplanet Atmosphere
Nikolov, Nikolay; Drummond, Benjamin; Gibson, Neale P. +7 more
We present a primary transit observation for the ultra-hot (T eq ∼ 2400 K) gas giant expolanet WASP-121b, made using the Hubble Space Telescope Wide Field Camera 3 in spectroscopic mode across the 1.12-1.64 µm wavelength range. The 1.4 µm water absorption band is detected at high confidence (5.4σ) in the planetary atmosphere…
The Link between Turbulence, Magnetic Fields, Filaments, and Star Formation in the Central Molecular Zone Cloud G0.253+0.016
Testi, L.; Federrath, C.; Bally, J. +8 more
Star formation is primarily controlled by the interplay between gravity, turbulence, and magnetic fields. However, the turbulence and magnetic fields in molecular clouds near the Galactic center may differ substantially compared to spiral-arm clouds. Here we determine the physical parameters of the central molecular zone (CMZ) cloud G0.253+0.016, …
Precise Strong Lensing Mass Modeling of Four Hubble Frontier Field Clusters and a Sample of Magnified High-redshift Galaxies
Ouchi, Masami; Shimasaku, Kazuhiro; Oguri, Masamune +2 more
We conduct precise strong lensing mass modeling of four Hubble Frontier Field (HFF) clusters, Abell 2744, MACS J0416.1-2403, MACS J0717.5+3745, and MACS J1149.6+2223, for which HFF imaging observations are completed. We construct a refined sample of more than 100 multiple images for each cluster by taking advantage of the full-depth HFF images, an…
A Comparison of Flare Forecasting Methods. I. Results from the “All-Clear” Workshop
Schrijver, C. J.; Zhang, J.; Leka, K. D. +15 more
Solar flares produce radiation that can have an almost immediate effect on the near-Earth environment, making it crucial to forecast flares in order to mitigate their negative effects. The number of published approaches to flare forecasting using photospheric magnetic field observations has proliferated, with varying claims about how well each wor…
Detection of an Atmosphere Around the Super-Earth 55 Cancri e
Tsiaras, A.; Waldmann, I. P.; Rocchetto, M. +8 more
We report the analysis of two new spectroscopic observations in the near-infrared of the super-Earth 55 Cancri e, obtained with the WFC3 camera on board the Hubble Space Telescope. 55 Cancri e orbits so close to its parent star that temperatures much higher than 2000 K are expected on its surface. Given the brightness of 55 Cancri, the observation…
Probing for Evidence of Plumes on Europa with HST/STIS
Deustua, S. E.; Sparks, W. B.; Hand, K. P. +3 more
Roth et al. (2014a) reported evidence for plumes of water venting from a southern high latitude region on Europa: spectroscopic detection of off-limb line emission from the dissociation products of water. Here, we present Hubble Space Telescope direct images of Europa in the far-ultraviolet (FUV) as it transited the smooth face of Jupiter to measu…