Search Publications
The impact of methane thermodynamics on seasonal convection and circulation in a model Titan atmosphere
Mitchell, Jonathan L.; Pierrehumbert, Raymond T.; Frierson, Dargan M. W. +1 more
We identify mechanisms controlling the distribution of methane convection and large-scale circulation in a simplified, axisymmetric model atmosphere of Titan forced by gray radiation and moist (methane) convection. The large-scale overturning circulation, or Hadley cell, is global in latitudinal extent and provides fundamental control of precipita…
A Multi-color Optical Survey of the Orion Nebula Cluster. I. The Catalog
Panagia, N.; Robberto, M.; Da Rio, N. +4 more
We present U, B, V, I broadband, 6200 Å TiO mediumband, and Hα narrowband photometry of the Orion Nebula Cluster (ONC) obtained with the WFI imager at the ESO/MPI 2.2 telescope at La Silla Observatory. The nearly simultaneous observations cover the entire ONC in a field of about 34 × 34 arcmin. They enable us to determine stellar colors avoiding t…
Hard X-Ray Properties of the Merging Cluster Abell 3667 as Observed with Suzaku
Sarazin, Craig L.; Fukazawa, Yasushi; Makishima, Kazuo +10 more
Wide-band Suzaku data on the merging cluster Abell 3667 were examined for hard X-ray emission in excess to the known thermal component. Suzaku detected X-ray signals in a wide energy band from 0.5 to 40keV. The hard X-ray (>10keV) flux observed by the HXD around the cluster center cannot be explained by a simple extension of the thermal emissio…
Transiting exoplanets from the CoRoT space mission. VII. The ``hot-Jupiter''-type planet CoRoT-5b
Mazeh, T.; Aigrain, S.; Alonso, R. +43 more
Aims: The CoRoT space mission continues to photometrically monitor about 12 000 stars in its field-of-view for a series of target fields to search for transiting extrasolar planets ever since 2007. Deep transit signals can be detected quickly in the “alarm-mode” in parallel to the ongoing target field monitoring. CoRoT's first planets have been de…
Resolving the Stellar Outskirts of M81: Evidence for a Faint, Extended Structural Component
Jablonka, P.; Ferguson, A. M. N.; Barker, M. K. +2 more
We present a wide field census of resolved stellar populations in the northern half of M81, conducted with Suprime-Cam on the 8 m Subaru telescope and covering an area ~0.3 deg2. The resulting color-magnitude diagram reaches over one magnitude below the red giant branch (RGB) tip, allowing a detailed comparison between the young and old…
Photometric anomalies of the lunar surface studied with SMART-1 AMIE data
Foing, B.; Kreslavsky, M.; Pinet, P. +6 more
We present new results from the mapping of lunar photometric function parameters using images acquired by the spacecraft SMART-1 (European Space Agency). The source data for selected lunar areas imaged by the AMIE camera of SMART-1 and the data processing are described. We interpret the behavior of photometric function in terms of lunar regolith p…
Planetary companions around the K giant stars 11 Ursae Minoris and HD 32518
Guenther, E. W.; Pasquini, L.; Hatzes, A. P. +2 more
Context: 11 UMi and HD 32518 belong to a sample of 62 K giant stars that has been observed since February 2004 using the 2m Alfred Jensch telescope of the Thüringer Landessternwarte (TLS) to measure precise radial velocities (RVs).
Aims: The aim of this survey is to investigate the dependence of planet formation on the mass of the host star by…
X-Ray Insights into the Nature of Weak Emission-Line Quasars at High Redshift
Brandt, W. N.; Strauss, Michael A.; Anderson, Scott F. +5 more
We present Chandra observations of nine high-redshift quasars (z = 2.7-5.9) discovered by the Sloan Digital Sky Survey with weak or undetectable high-ionization emission lines in their UV spectra (WLQs). Adding archival X-ray observations of six additional sources of this class has enabled us to place the strongest constraints yet on the X-ray pro…
Rotation Measures Across Parsec-Scale Jets of Fanaroff-Riley Type I Radio Galaxies
O'Dea, C. P.; Baum, S. A.; Kharb, P. +2 more
We present the results of a parsec-scale polarization study of three FRI radio galaxies—3C66B, 3C78, and 3C264—obtained with Very Long Baseline Interferometry at 5, 8, and 15 GHz. Parsec-scale polarization has been detected in a large number of beamed radio-loud active galactic nuclei, but in only a handful of the relatively unbeamed radio galaxie…
A global study of hot flow anomalies using Cluster multi-spacecraft measurements
Dandouras, I.; Facskó, G.; Erdos, G. +2 more
Hot flow anomalies (HFAs) are studied using observations of the magnetometer and the plasma instrument aboard the four Cluster spacecraft. We study several specific features of tangential discontinuities on the basis of Cluster measurements from the time periods of February-April 2003, December 2005-April 2006 and January-April 2007, when the sepa…