Search Publications
Missions
Journals
Publication Years
Three-dimensional global simulation of interplanetary coronal mass ejection propagation from the Sun to the heliosphere: Solar event of 12 May 1997
Wu, S. T.; Dryer, M.; Fry, C. D. +2 more
A newly developed hybrid code, HAFv.2+3DMHD, that combines two simulation codes, Hakamada-Akasofu-Fry code version 2 (HAFv.2) and a fully three-dimensional (3-D), time-dependent MHD simulation code, is used to study the global interplanetary coronal mass ejection (ICME) from the 12 May 1997 solar event. The solar wind structure is first simulated …
The outburst of the eruptive young star OO Serpentis between 1995 and 2006
Prusti, T.; Siebenmorgen, R.; Hony, S. +4 more
Aims:OO Serpentis is a deeply embedded pre-main sequence star in the Serpens NW star-forming region. The star went into outburst in 1995 and gradually faded afterwards. In many respects its eruption resembled the well-known FU Orionis-type (FUor) or EX Lupi-type (EXor) outbursts. Since very few such events have ever been documented at infrared wav…
Atmospheric composition, chemistry, and clouds
Esposito, Larry W.; Yung, Yuk L.; Mills, Franklin P.
Venus' atmosphere has a rich chemistry involving interactions among sulfur, chlorine, nitrogen, hydrogen, and oxygen radicals. The chemical regimes in the atmosphere range from ion-neutral reactions in the ionosphere to photochemistry in the middle atmosphere to thermal equilibrium chemistry and surface-atmosphere reactions in the lower atmosphere…
Ptolemy an Instrument to Measure Stable Isotopic Ratios of Key Volatiles on a Cometary Nucleus
Andrews, D. J.; Leese, M. R.; Zarnecki, J. C. +17 more
A fundamental goal of cometary studies is to determine the exact relationship between these bodies and the Solar System - the question(s) can be summarised as follows: did comets originate during the same events that spawned the Sun and planets, are they more primitive bodies that record a pre-solar history, or are they interstellar materials coll…
Feedback in the Antennae Galaxies (NGC 4038/9). I. High-Resolution Infrared Spectroscopy of Winds from Super Star Clusters
Graham, James R.; Gilbert, Andrea M.
We present high-resolution (R~24,600) near-IR spectroscopy of the youngest super star clusters (SSCs) in the prototypical starburst merger, the Antennae galaxies. These SSCs are young (3-7 Myr old) and massive (105-107 Msolar for a Kroupa initial mass function), and their spectra are characterized by broad, extende…
Role of photoionization in the formation of complex organic molecules in Titan's upper atmosphere
Imanaka, Hiroshi; Smith, Mark A.
Recent observations by the Cassini Orbiter suggest that complex organic chemistry occurs in the upper atmosphere of Titan. To understand the role of EUV-VUV light in the complex organic chemistry of Titan's upper atmosphere, we investigate the formation of gaseous species from a N2/CH4 gas mixture as a function of irradiation…
Measuring PAH Emission in Ultradeep Spitzer IRS Spectroscopy of High-Redshift IR-Luminous Galaxies
Frayer, D. T.; Scott, D.; Chary, R. +9 more
The study of the dominant population of high-redshift IR-luminous galaxies (1011-1012 Lsolar at 1<z<3), requires observation of sources at the ~0.1 mJy level in the mid-IR. We present the deepest spectra taken to date with the Infrared Spectrograph (IRS) on the Spitzer Space Telescope. We targeted two faint (…
Dust Environment Modelling of Comet 67P/Churyumov-Gerasimenko
Agarwal, Jessica; Grün, Eberhard; Müller, Michael
Dust is an important constituent of cometary emission; its analysis is one of the major objectives of ESA's Rosetta mission to comet 67P/Churyumov-Gerasimenko (C-G). Several instruments aboard Rosetta are dedicated to studying various aspects of dust in the cometary coma, all of which require a certain level of exposure to dust to achieve their go…
Local plasma processes and enhanced electron densities in the lower ionosphere in magnetic cusp regions on Mars
Gurnett, D. A.; Lundin, R.; Winningham, J. D. +11 more
Both the MARSIS ionospheric sounder and the charged particle instrument package ASPERA-3 are experiments on board the Mars Express spacecraft. Joint observations have shown that events of intense ionospheric electron density enhancements occur in the lower ionosphere of magnetic cusp regions, and that these enhancements are not associated with pre…
The Titan 14N/ 15N and 12C/ 13C isotopic ratios in HCN from Cassini/CIRS
Bézard, Bruno; Vinatier, Sandrine; Nixon, Conor A.
We report the detection of H 13CN and HC 15N in mid-infrared spectra recorded by the Composite Infrared Spectrometer (CIRS) aboard Cassini, along with the determination of the 12C/ 13C and 14N/ 15N isotopic ratios. We analyzed two sets of limb spectra recorded near 13-15° S (Tb flyb…