Search Publications
Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue
Olling, Rob P.; Shaya, Ed J.
We develop Bayesian statistical methods for discovering and assigning probabilities to non-random (e.g., physical) stellar companions. These companions are either presently bound or were previously bound. The probabilities depend on similarities in corrected proper motion parallel and perpendicular to the brighter component's motion, parallax, and…
Intermittent heating in the solar corona employing a 3D MHD model
Peter, H.; Bingert, S.
Aims: We investigate the spatial and temporal evolution of the heating of the corona of a cool star such as our Sun in a three-dimensional magneto-hydrodynamic (3D MHD) model.
Methods: We solve the 3D MHD problem numerically in a box representing part of the (solar) corona. The energy balance includes Spitzer heat conduction along the ma…
Transient surface liquid in Titan's polar regions from Cassini
Lorenz, R. D.; Wye, L. C.; Zebker, H. A. +12 more
Cassini RADAR images of Titan's south polar region acquired during southern summer contain lake features which disappear between observations. These features show a tenfold increases in backscatter cross-section between images acquired one year apart, which is inconsistent with common scattering models without invoking temporal variability. The mo…
The haze and methane distributions on Neptune from HST-STIS spectroscopy
Karkoschka, Erich; Tomasko, Martin G.
We analyzed a data cube of Neptune acquired with the Hubble STIS spectrograph on August 3, 2003. The data covered the full afternoon hemisphere at 0.1 arcsec spatial resolution between 300 and 1000 nm wavelength at 1 nm resolution. Navigation was accurate to 0.004 arcsec and 0.05 nm. We constrained the vertical aerosol structure with radiative tra…
A Magellan MIKE and Spitzer MIPS Study of 1.5-1.0 M sun Stars in Scorpius-Centaurus
Weinberger, Alycia J.; Chen, Christine H.; Mamajek, Eric E. +3 more
We obtained Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS) 24 µm and 70 µm observations of 182 nearby, Hipparcos F- and G-type common proper motion single and binary systems in the nearest OB association, Scorpius-Centaurus. We also obtained Magellan/MIKE R ~ 50,000 visual spectra at 3500-10500 Å for 181 candid…
The Surface Composition and Temperature of Asteroid 21 Lutetia As Observed by Rosetta/VIRTIS
Langevin, Y.; Bellucci, G.; Jaumann, R. +46 more
The Visible, InfraRed, and Thermal Imaging Spectrometer (VIRTIS) on Rosetta obtained hyperspectral images, spectral reflectance maps, and temperature maps of the asteroid 21 Lutetia. No absorption features, of either silicates or hydrated minerals, have been detected across the observed area in the spectral range from 0.4 to 3.5 micrometers. The s…
An Accounting of the Dust-obscured Star Formation and Accretion Histories Over the Last ~11 Billion Years
Frayer, D. T.; Chary, R. -R.; Dickinson, M. +3 more
We report on an accounting of the star-formation- and accretion-driven energetics of 24 µm-detected sources in the Great Observatories Origins Deep Survey-North field. For sources having infrared (IR; 8-1000 µm) luminosities gsim3 × 1012 L sun when derived by fitting local spectral energy distributions (SEDs) to 2…
The ACS LCID Project. V. The Star Formation History of the Dwarf Galaxy LGS-3: Clues to Cosmic Reionization and Feedback
Ferguson, Henry; Dolphin, Andrew; Tolstoy, Eline +11 more
We present an analysis of the star formation history (SFH) of the transition-type (dIrr/dSph) Local Group galaxy LGS-3 (Pisces) based on deep photometry obtained with the Advanced Camera for Surveys onboard the Hubble Space Telescope. Our observations reach the oldest main-sequence turnoffs at high signal to noise, allowing a time resolution at th…
Quantitative Analysis of CME Deflections in the Corona
Wang, Yuming; Wang, Shui; Shen, Chenglong +4 more
In this paper, ten CME events viewed by the STEREO twin spacecraft are analyzed to study the deflections of CMEs during their propagation in the corona. Based on the three-dimensional information of the CMEs derived by the graduated cylindrical shell (GCS) model (Thernisien, Howard, and Vourlidas in Astrophys. J.652, 1305, 2006), it is found that …
The HST/ACS Coma Cluster Survey. IV. Intergalactic Globular Clusters and the Massive Globular Cluster System at the Core of the Coma Galaxy Cluster
Ferguson, Henry C.; Miller, Bryan W.; Hudson, Michael J. +21 more
Intracluster stellar populations are a natural result of tidal interactions in galaxy clusters. Measuring these populations is difficult, but important for understanding the assembly of the most massive galaxies. The Coma cluster of galaxies is one of the nearest truly massive galaxy clusters and is host to a correspondingly large system of globul…