Search Publications
A Cool Dust Factory in the Crab Nebula: A Herschel Study of the Filaments
Ivison, R. J.; Henning, Th.; Krause, O. +13 more
Whether supernovae are major sources of dust in galaxies is a long-standing debate. We present infrared and submillimeter photometry and spectroscopy from the Herschel Space Observatory of the Crab Nebula between 51 and 670 µm as part of the Mass Loss from Evolved StarS program. We compare the emission detected with Herschel with multiwavele…
Composition of the Solar Corona, Solar Wind, and Solar Energetic Particles
Schmelz, J. T.; Reames, D. V.; von Steiger, R. +1 more
Along with temperature and density, the elemental abundance is a basic parameter required by astronomers to understand and model any physical system. The abundances of the solar corona are known to differ from those of the solar photosphere via a mechanism related to the first ionization potential of the element, but the normalization of these val…
Strong Tidal Dissipation in Saturn and Constraints on Enceladus' Thermal State from Astrometry
Charnoz, Sébastien; Mathis, Stéphane; Tobie, Gabriel +8 more
Tidal interactions between Saturn and its satellites play a crucial role in both the orbital migration of the satellites and the heating of their interiors. Therefore, constraining the tidal dissipation of Saturn (here the ratio k 2/Q) opens the door to the past evolution of the whole system. If Saturn's tidal ratio can be determined at…
EVLA Observations Constrain the Environment and Progenitor System of Type Ia Supernova 2011fe
Fransson, Claes; Chevalier, Roger A.; Chomiuk, Laura +7 more
We report unique Expanded Very Large Array observations of SN 2011fe representing the most sensitive radio study of a Type Ia supernova to date. Our data place direct constraints on the density of the surrounding medium at radii ~1015-1016 cm, implying an upper limit on the mass loss rate from the progenitor system of \dot{M}…
Near-ultraviolet Absorption, Chromospheric Activity, and Star-Planet Interactions in the WASP-12 system
Burwitz, V.; France, K.; Fossati, L. +15 more
Extended gas clouds have been previously detected surrounding the brightest known close-in transiting hot Jupiter exoplanets, HD 209458 b and HD 189733 b we observed the distant but more extreme close-in hot Jupiter system, WASP-12, with Hubble Space Telescope (HST). Near-UV (NUV) transits up to three times deeper than the optical transit of WASP-…
The Herschel Reference Survey: Dust in Early-type Galaxies and across the Hubble Sequence
Clements, D. L.; Ciesla, L.; Bianchi, S. +24 more
We present Herschel observations of 62 early-type galaxies (ETGs), including 39 galaxies morphologically classified as S0+S0a and 23 galaxies classified as ellipticals using SPIRE at 250, 350, and 500 µm as part of the volume-limited Herschel Reference Survey (HRS). We detect dust emission in 24% of the ellipticals and 62% of the S0s. The me…
Magnetic Field Structures Triggering Solar Flares and Coronal Mass Ejections
Kusano, K.; Yamamoto, T. T.; Iida, Y. +3 more
Solar flares and coronal mass ejections, the most catastrophic eruptions in our solar system, have been known to affect terrestrial environments and infrastructure. However, because their triggering mechanism is still not sufficiently understood, our capacity to predict the occurrence of solar eruptions and to forecast space weather is substantial…
A Systematic Survey of High-temperature Emission in Solar Active Regions
Winebarger, Amy R.; Warren, Harry P.; Brooks, David H.
The recent analysis of observations taken with the EUV Imaging Spectrometer and X-Ray Telescope instruments on Hinode suggests that well-constrained measurements of the temperature distribution in solar active regions can finally be made. Such measurements are critical for constraining theories of coronal heating. Past analysis, however, has suffe…
The Direct Detection of Cool, Metal-enriched Gas Accretion onto Galaxies at z ~ 0.5
Prochaska, J. Xavier; Koo, David C.; Rubin, Kate H. R. +1 more
We report on the discovery of cool gas inflow toward six star-forming galaxies with redshifts z ~ 0.35-1. Analysis of Mg II and Fe II resonance-line absorption in Keck/LRIS spectroscopy of the galaxies reveals positive velocity shifts for cool gas of 80-200 km s-1 with respect to the host galaxy velocity centroids, and equivalent widths…
The BOSS Emission-Line Lens Survey (BELLS). I. A Large Spectroscopically Selected Sample of Lens Galaxies at Redshift ~0.5
Brownstein, Joel R.; Schlegel, David J.; Schneider, Donald P. +11 more
We present a catalog of 25 definite and 11 probable strong galaxy-galaxy gravitational lens systems with lens redshifts 0.4 <~ z <~ 0.7, discovered spectroscopically by the presence of higher-redshift emission lines within the Baryon Oscillation Spectroscopic Survey (BOSS) of luminous galaxies, and confirmed with high-resolution Hubble Space…