Search Publications
The needle in the haystack: searching for transiting extrasolar planets in CoRoT stellar light curves
Pätzold, M.; Grziwa, S.; Carone, L.
EXOTRANS is a software package developed by the Department of Planetary Research of the Rheinisches Institut für Umweltforschung (RIU-PF) at Cologne University for detecting transit signals from extrasolar planets in stellar light curves. EXOTRANS is used very successfully by RIU-PF within the CoRoT mission. The software package uses two different…
ULF wave activity during the 2003 Halloween superstorm: multipoint observations from CHAMP, Cluster and Geotail missions
Tsinganos, K.; Daglis, I. A.; Haagmans, R. +4 more
We examine data from a topside ionosphere and two magnetospheric missions (CHAMP, Cluster and Geotail) for signatures of ultra low frequency (ULF) waves during the exceptional 2003 Halloween geospace magnetic storm, when Dst reached ~-380 nT. We use a suite of wavelet-based algorithms, which are a subset of a tool that is being developed for the a…
Suzaku Observations of the Non-thermal Supernova Remnant HESS J1731-347
Acero, Fabio; Klochkov, Dmitry; Bamba, Aya +7 more
A detailed analysis of the non-thermal X-ray emission from the northwestern and southern parts of the supernova remnant (SNR) HESS J1731-347 with Suzaku is presented. The shell portions covered by the observations emit hard and lineless X-rays. The spectrum can be reproduced by a simple absorbed power-law model with a photon index Γ of 1.8-2.7 and…
Constraints on Saturn's tropospheric general circulation from Cassini ISS images
Del Genio, Anthony D.; Barbara, John M.
An automated cloud tracking algorithm is applied to Cassini Imaging Science Subsystem high-resolution apoapsis images of Saturn from 2005 and 2007 and moderate resolution images from 2011 and 2012 to define the near-global distribution of zonal winds and eddy momentum fluxes at the middle troposphere cloud level and in the upper troposphere haze. …
Cyclotron resonance energies and orbital elements of accretion pulsar 4U 0115+63 during the giant outburst in 2008
Wang, Wei; Zhao, Yongheng; Li, Jun
In this paper, we present both timing and spectral analyses of the outburst of 4U 0115+63 in 2008 April-May with International Gamma-Ray Astrophysics Laboratory (INTEGRAL) and Rossi X-ray Timing Explorer (RXTE) observations. We have determined the spin period of the neutron star at ∼3.614 30 ± 0.000 03 s, a spin-up rate during the outburst of ?, t…
The Photometric Study of a Neglected Near Contact Binary: BS Vulpeculae
Zejda, M.; Liška, J.; Qian, S. -B. +3 more
We present a detailed study of the close eclipsing binary BS Vulpeculae. Although it is relatively bright (V: 10.9-11.6 mag) and belongs to short-periodic variable stars (P = 0.48 days), it is rather neglected. To perform a thorough period analysis, we collected all available photometric observations that span the time interval of 1898-2010. Obser…
Spin-down Measurement of PSR J1813-1749: The Energetic Pulsar Powering HESS J1813-178
Camilo, F.; Gotthelf, E. V.; Halpern, J. P.
Two new X-ray timing observations of the 44.7 ms pulsar in G12.82-0.02/HESS J1813-178 were obtained with Chandra and XMM-Newton to determine its precise spin-down rate. With a period derivative of \dot{P} = 1.265\times 10^{-13}, PSR J1813-1749 is the third most energetic pulsar in the Galaxy, having spin-down luminosity \dot{E} = 5.6\times 10^{37}…
H2O line mapping at high spatial and spectral resolution. Herschel observations of the VLA 1623 outflow
Liseau, R.; Benedettini, M.; van Dishoeck, E. F. +12 more
Context. Apart from being an important coolant, water is known to be a tracer of high-velocity molecular gas. Recent models predict relatively high abundances behind interstellar shockwaves. The dynamical and physical conditions of the water emitting gas, however, are not fully understood yet. Using the Herschel Space Observatory, it is now possib…
A simple empirically motivated template for the thermal Sunyaev-Zel'dovich effect
Efstathiou, George; Migliaccio, Marina
We develop a model for the power spectrum of unresolved clusters of galaxies arising from the thermal Sunyaev-Zel'dovich (tSZ) effect. The model is based on a 'universal' gas pressure profile constrained by X-ray observations and includes a parameter to describe departures from self-similar evolution. The model is consistent with recent Planck obs…
Herschel PACS Observations and Modeling of Debris Disks in the Tucana-Horologium Association
Ménard, F.; Dent, W. R. F.; Krivov, A. V. +9 more
We present Herschel PACS photometry of 17 B- to M-type stars in the 30 Myr old Tucana-Horologium Association. This work is part of the Herschel Open Time Key Programme "Gas in Protoplanetary Systems". 6 of the 17 targets were found to have infrared excesses significantly greater than the expected stellar IR fluxes, including a previously unknown d…