Search Publications
Multi-point Shock and Flux Rope Analysis of Multiple Interplanetary Coronal Mass Ejections around 2010 August 1 in the Inner Heliosphere
Liu, Y.; Luhmann, J. G.; Webb, D. F. +20 more
We present multi-point in situ observations of a complex sequence of coronal mass ejections (CMEs) which may serve as a benchmark event for numerical and empirical space weather prediction models. On 2010 August 1, instruments on various space missions, Solar Dynamics Observatory/Solar and Heliospheric Observatory/Solar-TErrestrial-RElations-Obser…
Low-energy ions: A previously hidden solar system particle population
André, M.; Cully, C. M.
Ions with energies less than tens of eV originate from the Terrestrial ionosphere and from several planets and moons in the solar system. The low energy indicates the origin of the plasma but also severely complicates detection of the positive ions onboard sunlit spacecraft at higher altitudes, which often become positively charged to several tens…
SEDfit: Software for Spectral Energy Distribution Fitting of Photometric Data
Sawicki, Marcin
This article describes SEDfit, the earliest—but continually upgraded—software package for spectral energy distribution fitting (SED fitting) of high-redshift photometric data, and the only one to properly treat nondetections. The principles of maximum-likelihood SED fitting are described, including formulae used for fitting both detected and undet…
Uncloaking Globular Clusters in the Inner Galaxy
Minniti, Dante; Mateo, Mario; von Braun, Kaspar +4 more
Extensive photometric studies of the globular clusters located toward the center of the Milky Way have been historically neglected. The presence of patchy differential reddening in front of these clusters has proven to be a significant obstacle to their detailed study. We present here a well defined and reasonably homogeneous photometric database …
Evaporating very small grains as tracers of the UV radiation field in photo-dissociation regions
Joblin, C.; Pilleri, P.; Montillaud, J. +1 more
Context. In photo-dissociation regions (PDRs), polycyclic aromatic hydrocarbons (PAHs) may be produced by evaporation of very small grains (VSGs) by the impinging UV radiation field from a nearby star.
Aims: We quantitatively investigate the transition zone between evaporating VSGs (eVSGs) and PAHs in several PDRs.
Methods: We studied th…
Polar methane accumulation and rainstorms on Titan from simulations of the methane cycle
Brown, M. E.; Schaller, E. L.; Schneider, T. +1 more
Titan has a methane cycle akin to Earth's water cycle. It has lakes in polar regions, preferentially in the north; dry low latitudes with fluvial features and occasional rainstorms; and tropospheric clouds mainly (so far) in southern middle latitudes and polar regions. Previous models have explained the low-latitude dryness as a result of atmosphe…
Electron acceleration in the reconnection diffusion region: Cluster observations
André, M.; Vaivads, A.; Sahraoui, F. +10 more
We present one case study of magnetic islands and energetic electrons in the reconnection diffusion region observed by the Cluster spacecraft. The cores of the islands are characterized by strong core magnetic fields and density depletion. Intense currents, with the dominant component parallel to the ambient magnetic field, are detected inside the…
The Earliest Phases of Star Formation (EPoS): a Herschel key program. The precursors to high-mass stars and clusters
Henning, Th.; Krause, O.; Balog, Z. +14 more
Context. Stars are born deeply embedded in molecular clouds. In the earliest embedded phases, protostars emit the bulk of their radiation in the far-infrared wavelength range, where Herschel is perfectly suited to probe at high angular resolution and dynamic range. In the high-mass regime, the birthplaces of protostars are thought to be in the hig…
Direct Imaging Confirmation and Characterization of a Dust-enshrouded Candidate Exoplanet Orbiting Fomalhaut
Burrows, Adam; Currie, Thayne; Fukagawa, Misato +6 more
We present Subaru/IRCS J-band data for Fomalhaut and a (re)reduction of archival 2004-2006 HST/ACS data first presented by Kalas et al. We confirm the existence of a candidate exoplanet, Fomalhaut b, in both the 2004 and 2006 F606W data sets at a high signal-to-noise ratio. Additionally, we confirm the detection at F814W and present a new detectio…
Expanded Search for z ~ 10 Galaxies from HUDF09, ERS, and CANDELS Data: Evidence for Accelerated Evolution at z > 8?
Trenti, M.; Oesch, P. A.; Carollo, C. M. +7 more
We search for z ~ 10 galaxies over ~160 arcmin2 of Wide-Field Camera 3 (WFC3)/IR data in the Chandra Deep Field South, using the public HUDF09, Early Release Science, and CANDELS surveys, that reach to 5σ depths ranging from 26.9 to 29.4 in H 160 AB mag. z >~ 9.5 galaxy candidates are identified via J 125 - H