Search Publications
Water Vapor in the Spectrum of the Extrasolar Planet HD 189733b. I. The Transit
Deming, D.; Crouzet, N.; Madhusudhan, N. +1 more
We report near-infrared spectroscopy of the gas giant planet HD 189733b in transit. We used the Hubble Space Telescope Wide Field Camera 3 (HST WFC3) with its G141 grism covering 1.1 µm to 1.7 µm and spatially scanned the image across the detector at 2'' s-1. When smoothed to 75 nm bins, the local maxima of the transit depth…
Hydrogen-poor Superluminous Supernovae and Long-duration Gamma-Ray Bursts Have Similar Host Galaxies
Price, P. A.; Berger, E.; Kirshner, R. P. +27 more
We present optical spectroscopy and optical/near-IR photometry of 31 host galaxies of hydrogen-poor superluminous supernovae (SLSNe), including 15 events from the Pan-STARRS1 Medium Deep Survey. Our sample spans the redshift range 0.1 <~ z <~ 1.6, and is the first comprehensive host galaxy study of this specific subclass of cosmic explosions…
A Panchromatic View of the Restless SN 2009ip Reveals the Explosive Ejection of a Massive Star Envelope
Im, M.; Choi, C.; Campana, S. +54 more
The double explosion of SN 2009ip in 2012 raises questions about our understanding of the late stages of massive star evolution. Here we present a comprehensive study of SN 2009ip during its remarkable rebrightenings. High-cadence photometric and spectroscopic observations from the GeV to the radio band obtained from a variety of ground-based and …
Evidence for Wide-spread Active Galactic Nucleus-driven Outflows in the Most Massive z ~ 1-2 Star-forming Galaxies
Wuyts, E.; Berta, S.; Lutz, D. +35 more
In this paper, we follow up on our previous detection of nuclear ionized outflows in the most massive (log(M */M ⊙) >= 10.9) z ~ 1-3 star-forming galaxies by increasing the sample size by a factor of six (to 44 galaxies above log(M */M ⊙) >= 10.9) from a combination of the SINS/zC-SINF, LUCI, GNIRS…
The COS-Dwarfs Survey: The Carbon Reservoir around Sub-L* Galaxies
Tripp, Todd M.; Kollmeier, Juna A.; Prochaska, J. Xavier +12 more
We report new observations of circumgalactic gas from the COS-Dwarfs survey, a systematic investigation of the gaseous halos around 43 low-mass z <= 0.1 galaxies using background QSOs observed with the Cosmic Origins Spectrograph. From the projected one-dimensional and two-dimensional distribution of C IV absorption, we find that C IV is detect…
High-density Circumstellar Interaction in the Luminous Type IIn SN 2010jl: The First 1100 Days
Smith, Nathan; France, Kevin; Fransson, Claes +16 more
Hubble Space Telescope and ground-based observations of the Type IIn supernova (SN) 2010jl are analyzed, including photometry and spectroscopy in the ultraviolet, optical, and near-IR bands, 26-1128 days after first detection. At maximum, the bolometric luminosity was ~3 × 1043 erg s-1 and even at 850 days exceeds 1042
BICEP2. II. Experiment and three-year Data Set
Ade, P. A. R.; Bock, J. J.; Hildebrandt, S. R. +49 more
We report on the design and performance of the BICEP2 instrument and on its three-year data set. BICEP2 was designed to measure the polarization of the cosmic microwave background (CMB) on angular scales of 1°-5°(l = 40-200), near the expected peak of the B-mode polarization signature of primordial gravitational waves from cosmic inflation. Measur…
Cosmology from Gravitational Lens Time Delays and Planck Data
Treu, T.; Blandford, R. D.; Auger, M. W. +11 more
Under the assumption of a flat ΛCDM cosmology, recent data from the Planck satellite point toward a Hubble constant that is in tension with that measured by gravitational lens time delays and by the local distance ladder. Prosaically, this difference could arise from unknown systematic uncertainties in some of the measurements. More interestingly—…
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. I. First Results from a New Reverberation Mapping Campaign
Kaspi, Shai; Netzer, Hagai; Du, Pu +8 more
We report first results from a large project to measure black hole (BH) mass in high accretion rate active galactic nuclei (AGNs). Such objects may be different from other AGNs in being powered by slim accretion disks and showing saturated accretion luminosities, but both are not yet fully understood. The results are part of a large reverberation …
Lyα Transit Spectroscopy and the Neutral Hydrogen Tail of the Hot Neptune GJ 436b
Loyd, R. O. Parke; France, Kevin; Kulow, Jennifer R. +1 more
To date, more than 750 planets have been discovered orbiting stars other than the Sun. Two sub-classes of these exoplanets, "hot Jupiters" and their less massive counterparts "hot Neptunes," provide a unique opportunity to study the extended atmospheres of planets outside of our solar system. We describe here the first far-ultraviolet transit stud…