Search Publications
Limb Darkening study using Venus nightside infrared spectra from VIRTIS-Venus Express data
Drossart, Pierre; Longobardo, Andrea; Palomba, Ernesto +3 more
The Limb Darkening (LD) effect consists in an attenuation of the measured radiance at increasing emergence angles, due to the larger portion of the atmosphere traversed by the radiation observed at higher emergence angles. The behaviour of radiance emerging with atmosphere as function of the emergence angle (i.e., the Limb Darkening Function) is r…
Optical and infrared imaging and spectroscopy of the multiple-shell planetary nebula NGC 6369
Guerrero, M. A.; Ramos-Larios, G.; Phillips, J. P. +1 more
NGC 6369 is a double-shell planetary nebula consisting of a bright annular inner shell with faint bipolar extensions and a filamentary envelope. We have used ground- and space-based narrow-band optical and near-infrared (near-IR) images, broad-band mid-IR images, optical long-slit echelle spectra and mid-IR spectra to investigate its physical stru…
Two New Bursting Neutron Star Low-mass X-Ray Binaries: Swift J185003.2-005627 and Swift J1922.7-1716
Altamirano, D.; Degenaar, N.; Wijnands, R. +1 more
We discuss the origin of two triggers of Swift's Burst Alert Telescope (BAT) that occurred in 2011. The triggers were identified with Swift J185003.2-005627, a previously unknown X-ray source, and the known but unclassified X-ray transient Swift J1922.7-1716. We investigate the BAT data and follow-up observations obtained with Swift's X-ray and ul…
The light curve of asteroid 21 Lutetia measured by VIRTIS-M during the Rosetta fly-by
Erard, S.; Capaccioni, F.; Coradini, A. +7 more
On 10 July 2010, the Rosetta spacecraft encountered the asteroid 21 Lutetia on its way to the comet 67P/Churyumov-Gerasimenko. This was the second of two planned asteroid fly-bys performed by the probe, the first fly-by being with the much smaller asteroid 2867 Steins in September 2008. The VIRTIS imaging spectrometer (angular resolution 0.250 mra…
Hydrated minerals in the deposits of Aureum Chaos
Neukum, G.; McGuire, P. C.; Sowe, M. +1 more
Hydrated minerals have been detected in many martian chaos regions and chasmata, playing a major role in its past aqueous activity. Based on short wave infrared data from CRISM, imagery and elevation data, we identified and mapped hydrated minerals in Aureum Chaos to shed light on their stratigraphy and geological context.
The Interior Layere…First Simultaneous Detection of Moving Magnetic Features in Photospheric Intensity and Magnetic Field Data
Yurchyshyn, Vasyl; Lim, Eun-Kyung; Goode, Philip
The formation and the temporal evolution of a bipolar moving magnetic feature (MMF) was studied with high-spatial and temporal resolution. The photometric properties were observed with the New Solar Telescope at Big Bear Solar Observatory using a broadband TiO filter (705.7 nm), while the magnetic field was analyzed using the spectropolarimetric d…
Bolocam Observations of Two Unconfirmed Galaxy Cluster Candidates from the Planck Early Sunyaev-Zel'dovich Sample
Umetsu, K.; Bridge, C.; Sayers, J. +5 more
We present Bolocam observations of two galaxy cluster candidates reported as unconfirmed in the Planck early Sunyaev-Zel'dovich (eSZ) sample, PLCKESZ G115.71+17.52 and PLCKESZ G189.84-37.24. We observed each of these candidates with Bolocam at 140 GHz from the Caltech Submillimeter Observatory in 2011 October. The resulting images have white noise…
Type II solar radio bursts: 2. Detailed comparison of theory with observations
Cairns, Iver H.; Robinson, P. A.; Hillan, D. S.
In this paper, the second in a two paper series, we quantitatively compare a detailed theory for type II solar radio bursts with observations and extract the parameters of the associated shocks. We use the techniques and assessment parameters developed and demonstrated in the companion paper for artificial data sets and solar wind models. Here we …
Modeling an array of encapsulated germanium detectors
Kshetri, R.
A probability model has been presented for understanding the operation of an array of encapsulated germanium detectors generally known as composite detector. The addback mode of operation of a composite detector has been described considering the absorption and scattering of γ-rays. Considering up to triple detector hit events, we have obtained ex…
Optical depth of the Martian atmosphere and surface albedo from high-resolution orbiter images
Thomas, N.; Hoekzema, N. M.; Stenzel, O. J. +2 more
In this paper we describe and evaluate the so-called shadow method. This method can be used to estimate the optical depth of the Martian atmosphere from the differences in brightness between shadowed and sunlit regions observed from an orbiter. We present elaborate and simplified versions of the method and analyze the capabilities and the sources …