Search Publications
Limits on the size of aerosols from measurements of linear polarization in Titan’s atmosphere
Tomasko, M. G.; Doose, L. R.; Dafoe, L. E. +1 more
The Descent Imager/Spectral Radiometer (DISR) instrument on the Huygens probe into the atmosphere of Titan yielded information on the size, shape, optical properties, and vertical distribution of haze aerosols in the atmosphere of Titan [Tomasko, M.G., Doose, L., Engel, S., Dafoe, L.E., West, R., Lemmon, M., Karkoschka, E., 2008. Planet. Space Sci…
VLT/SINFONI time-resolved spectroscopy of the central, luminous, H-rich WN stars of R136
Chené, A. -N.; Moffat, A. F. J.; Schnurr, O. +2 more
Using the Very Large Telescope's Spectrograph for INtegral Field Observation in the Near-Infrared, we have obtained repeated adaptive-optics-assisted, near-infrared spectroscopy of the six central luminous, Wolf-Rayet (WR) stars in the core of the very young (~1 Myr), massive and dense cluster R136, in the Large Magellanic Cloud (LMC). We also de-…
A Young Super Star Cluster in the Nuclear Region of NGC 253
McCrady, Nate; Kornei, Katherine A.
We present observations of a massive star cluster near the nuclear region of the nearby starburst galaxy NGC 253. The peak of near-infrared (IR) emission, which is spatially separated by 4'' from the kinematic center of the galaxy, is coincident with a super star cluster whose properties we examine with low-resolution (R ~ 1200) infrared Cerro Tol…
Near-IR search for lensed supernovae behind galaxy clusters. II. First detection and future prospects
Lidman, C.; Amanullah, R.; Goobar, A. +11 more
Aims: Powerful gravitational telescopes in the form of massive galaxy clusters can be used to enhance the light collecting power over a limited field of view by about an order of magnitude in flux. This effect is exploited here to increase the depth of a survey for lensed supernovae at near-IR wavelengths.
Methods: We present a pilot supernova…
Evidence for carbonyl sulfide (OCS) conversion to CO in the lower atmosphere of Venus
Bézard, B.; Marcq, E.; Yung, Yuk L. +4 more
The chemical regimes in the atmosphere of Venus vary from photochemistry in the middle atmosphere to thermal equilibrium chemistry in the lower atmosphere and the surface. Many chemical cycles have been proposed, but few details about these cycles are fully verified by comparison between observations and modeling. Recent high-quality data of carbo…
Observation of Solar Wind Charge Exchange Emission from Exospheric Material in and Outside Earth's Magnetosheath 2008 September 25
Lepri, S. T.; Kuntz, K. D.; Snowden, S. L. +4 more
A long XMM-Newton exposure is used to observe solar wind charge exchange (SWCX) emission from exospheric material in and outside Earth's magnetosheath. The light curve of the O VII (0.5-0.62 keV) band is compared with a model for the expected emission, and while the emission is faint and the light curve has considerable scatter, the correlation is…
Emerging and Decaying Magnetic Flux and Subsurface Flows
Howe, R.; Komm, R.; Hill, F.
We study the temporal variation of subsurface flows of 788 active regions and 978 quiet regions. The vertical-velocity component used in this study is derived from the divergence of the measured horizontal flows using mass conservation. The horizontal flows cover a range of depths from the surface to about 16 Mm and are determined by analyzing abo…
High velocity outflows in narrow absorption line quasars
Chartas, G.; Giustini, M.; Charlton, J. +6 more
The current paradigm for the AGN phenomenon is a central engine that consists of an inflow of material accreting in the form of a disk onto a supermassive black hole. Observations in the UV and optical find high velocity ionized material outflowing from the black hole. We present results from Suzaku and XMM-Newton observations of a sample of intri…
Giant vortices lead to ion escape from Venus and re-distribution of plasma in the ionosphere
Barabash, S.; Zhang, T. L.; Balikhin, M. A. +3 more
The interaction of the solar wind with Venus has a significant influence on the evolution of its atmosphere. Due to the lack of an intrinsic planetary magnetic field, there is direct contact between the fast flowing solar wind and the Venusian ionosphere. This leads to a number of different types of atmospheric escape process. Using Venus Express …
Yearly and seasonal variations of low albedo surfaces on Mars in the OMEGA/MEx dataset: Constraints on aerosols properties and dust deposits
Bibring, J. -P.; Gondet, B.; Langevin, Y. +5 more
The time variations of spectral properties of dark martian surface features are investigated using the OMEGA near-IR dataset. The analyzed period covers two Mars years, spanning from early 2004 to early 2008 (includes the 2007 global dust event). Radiative transfer modeling indicates that the apparent albedo variations of low to mid-latitude dark …