Search Publications
Noncircular features in Saturn's rings I: The edge of the B ring
Nicholson, Philip D.; French, Richard G.; Hedman, Matthew M. +2 more
A comprehensive investigation of all available radio and stellar occultation data for the outer edge of Saturn's B ring, spanning the period 1980-2010, confirms that the m = 2 distortion due to the strong Mimas 2:1 inner Lindblad resonance circulates slowly relative to Mimas in a prograde direction, with a frequency ΩL = 0.1819° d-…
Evolution of isolated G-band bright points: size, intensity and velocity
Feng, Song; Wang, Feng; Deng, Hui +3 more
We study the evolution pattern of isolated G-band bright points (GBPs) in terms of their size, intensity and velocity. Using a high resolution image sequence taken with the Hinode/Solar Optical Telescope (SOT), we detect GBPs in each image by the Laplacian and Morphological Dilation algorithm, and track their evolutions by a 26-adjacent method in …
ALMA-backed NIR high resolution integral field spectroscopy of the NUGA galaxy NGC 1433
Eckart, Andreas; García-Marín, Macarena; Combes, Françoise +7 more
Aims: We present the results of near-infrared (NIR) H- and K-band European Southern Observatory SINFONI integral field spectroscopy (IFS) of the Seyfert 2 galaxy
Three infrared spectrometers, an atmospheric chemistry suite for the ExoMars 2016 trace gas orbiter
Montmessin, Franck; Korablev, Oleg; Moshkin, Boris +8 more
The atmospheric chemistry suite (ACS) package is a part of the Russian contribution to the ExoMars ESA-Roscosmos mission. ACS consists of three separate infrared spectrometers, sharing common mechanical, electrical, and thermal interfaces. The near-infrared (NIR) channel is a versatile spectrometer for the spectral range of 0.7-1.6 µm with a…
Characterization of the Benchmark Binary NLTT 33370
Henning, Thomas; Skemer, Andrew; Leisenring, Jarron +16 more
We confirm the binary nature of the nearby, very low mass (VLM) system NLTT 33370 with adaptive optics imaging and present resolved near-infrared photometry and integrated light optical and near-infrared spectroscopy to characterize the system. VLT-NaCo and LBTI-LMIRCam images show significant orbital motion between 2013 February and 2013 April. O…
Formaldehyde Chemistry in Cometary Ices: On the Prospective Detection of NH2CH2OH, HOCH2OH, and POM by the On-board ROSINA Instrument of the Rosetta Mission
Duvernay, F.; Danger, G.; Theulé, P. +2 more
The thermal reactivity of a water-dominated cometary ice analog containing H2CO and NH3 is investigated by means of Fourier transform infrared spectroscopy, mass spectrometry, and B3LYP calculations. Three products are characterized by these techniques: aminomethanol (NH2CH2OH), methyleneglycol (HOCH
Time transfer functions as a way to validate light propagation solutions for space astrometry
Bertone, Stefano; Crosta, Mariateresa; Vecchiato, Alberto +3 more
Given the extreme accuracy of modern space astrometry, a precise relativistic modeling of observations is required. Concerning light propagation, the standard procedure is the solution of the null-geodesic equations. However, another approach based on the time transfer functions (TTF) has demonstrated its capability to give access to key quantitie…
Derivation of an Analytical Approximation of the Spectrum of Spinning Dust Emission
Stevenson, Matthew A.
An analytical function for the spectrum of spinning dust emission is presented. It is derived through the application of careful approximations, with each step tested against numerical calculations. This approach ensures accuracy while providing an intuitive picture of the physics. The final result may be useful for fitting of anomalous microwave …
Spectrum characteristics of electromagnetic ion cyclotron triggered emissions and associated energetic proton dynamics
Omura, Yoshiharu; Shoji, Masafumi
We perform parametric analyses of electromagnetic ion cyclotron (EMIC) triggered emissions with a gradient of the nonuniform ambient magnetic field using a hybrid simulation. According to nonlinear wave growth theory, as the gradient of the ambient magnetic field becomes larger, the theoretical threshold of the wave amplitude becomes larger, altho…
On the Collective Magnetic Field Strength and Vector Structure of Dark Umbral Cores Measured by the Hinode Spectropolarimeter
Schad, T. A.
We study 7530 sunspot umbrae and pores measured by the Hinode Spectropolarimeter (SP) between November 2006 and November 2012. We primarily seek confirmation of the long term secular decrease in the mean magnetic field strength of sunspot umbrae found by Penn and Livingston (IAU Symp.273, 126, 2011) between 1998 and 2011. The excellent SP photomet…