Search Publications
Interferometric Studies of the Extreme Binary epsilon Aurigae: Pre-Eclipse Observations
Stencel, Robert E.; Creech-Eakman, Michelle; Hart, Alexa +3 more
We report new and archival K-band interferometric uniform disk diameters obtained with the Palomar Testbed Interferometer for the eclipsing binary star epsilon Aurigae, in advance of the start of its eclipse in 2009. The observations were intended to test whether low-amplitude variations in the system are connected with the F supergiant star (prim…
Spatial variability of carbon monoxide in Venus' mesosphere from Venus Express/Visible and Infrared Thermal Imaging Spectrometer measurements
Irwin, P. G. J.; Drossart, P.; Piccioni, G. +6 more
Observations of Venus' mesosphere by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS)-M instrument of Venus Express have been used to investigate the spatial distribution of CO above Venus' nightside cloud tops by fitting the CO absorption in the (1-0) CO band around 4.7 µm. We find little spatial variation in the abundance of …
Exospheric heating by pickup ions at Titan
Ip, W. -H.; Kopp, A.; Tseng, W. -L.
Titan has a very extensive atmosphere and exosphere which interact strongly with the corotating magnetospheric plasma. Some of the new pickup ions created in the vicinity of the exosphere will re-impact the upper atmosphere causing additional energy input. Previous investigations of the atmospheric collisional interaction of the pickup ions have g…
VLBI for better gravimetry in SELENE
Noda, H.; Tamura, Y.; Tsuruta, S. +17 more
The Japanese lunar explorer SELENE (SElenological and Engineering Explorer), to be launched in 2007, will for the first time utilize VLBI observations in lunar gravimetry investigations. This will particularly improve the accuracy to which the low degree gravitational harmonics and the gravity field near the limb can be measured, and when combined…
AG Draconis observed with XMM-Newton
Bernabei, S.; Rossi, C.; Frasca, A. +5 more
Context:
Aims: Study of the X-ray spectrum of this peculiar binary system, covering both quiescence and activity periods, is necessary to investigate the physics of the high temperature spectral component, and…
Inversion solutions of the elliptic cone model for disk frontside full halo coronal mass ejections
Zhao, X. P.
A new algorithm is developed for inverting six unknown elliptic cone model parameters from five observed CME halo parameters. It is shown that the halo parameter α includes the information on the coronal mass ejection (CME) propagation direction denoted by two model parameters. On the basis of the given halo parameter α, two approaches are present…
Photometric redshifts with surface brightness priors
Connolly, Andrew; Jain, Bhuvnesh; Stabenau, Hans F.
We use galaxy surface brightness as prior information to improve photometric redshift (photo-z) estimation. We apply our template-based photo-z method to imaging data from the ground-based VVDS survey and the space-based GOODS field from HST, and use spectroscopic redshifts to test our photometric redshifts for different galaxy types and redshifts…
Expansion Velocities and Core Masses of Bright Planetary Nebulae in the Virgo Cluster
Freeman, Kenneth C.; Gerhard, Ortwin; Ciardullo, Robin +5 more
The line-of-sight velocities and [O III] 5007 Å expansion velocities are measured for 11 planetary nebulae (PNs) in the Virgo Cluster core, at 15 Mpc distance, with the FLAMES spectrograph on the ESO VLT. These PNs are located about halfway between the two giant elliptical galaxies M87 and M86. From the [O III] 5007 Å line profile widths, the aver…
Extended 3He-rich Periods of Solar Energetic Particles in Structured Solar Wind
Mason, G. M.; Kocharov, L.; Laivola, J. +2 more
We have surveyed helium isotope abundance data (1997-2005) measured with the Ultra-Low-Energy Isotope Spectrometer (ULEIS) on the Advanced Composition Explorer (ACE) and have found multiday periods of 3He-rich solar energetic particles (SEPs) in the energy range of ~0.4-10 MeV nucleon-1 with 3He/4He ~ 0.…
Ionospheric oxygen ions dominant bursty bulk flows: Cluster and Double Star observations
Zhang, H.; Zong, Q. -G.; Daly, P. W. +5 more
Two extreme oxygen-rich bursty bulk flows (BBFs) with predominant ionospheric O+ ions have been observed on 8 November 2004 by the Cluster and Double Star spacecraft during a strong magnetic storm time period with Dst = -373 nT. The oxygen densities in two BBFs are found to be 3-5 times larger than the hydrogen densities and the oxygen …