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An HST search for planets in the lower main sequence of the globular cluster NGC 6397
Bedin, L. R.; Rich, R. M.; Piotto, G. +2 more
Searches for planetary transits carried out in open and globular clusters have to date yielded only a handful of weak, unconfirmed candidates. These results have been interpreted as either being insignificant, or evidence that the cluster chemical or dynamical environment inhibits planetary formation or survival. Most campaigns have been limited b…
Large-scale Magnetic Helicity Fluxes Estimated from MDI Magnetic Synoptic Charts over the Solar Cycle 23
Zhang, Hongqi; Yang, Shangbin
To investigate the characteristics of large-scale and long-term evolution of magnetic helicity with solar cycles, we use the method of Local Correlation Tracking to estimate the magnetic helicity evolution over solar cycle 23 from 1996 to 2009 using 795 MDI magnetic synoptic charts. The main results are as follows: the hemispheric helicity rule st…
Masses and accretion rates of supermassive black holes in active galactic nuclei from the INTEGRAL survey
Sazonov, S. Yu.; Khorunzhev, G. A.; Burenin, R. A. +1 more
The masses of 68 supermassive black holes (SMBHs) in nearby ( z < 0.15) active galactic nuclei (AGNs) detected by the INTEGRAL observatory in the hard X-ray energy band (17-60 keV) outside the Galactic plane (| b| 5°) have been estimated. Well-known relations between the SMBHmass and (1) the infrared luminosity of the stellar bulge (from 2MASS …
Hard X-Ray and Ultraviolet Observations of the 2005 January 15 Two-ribbon Flare
Qiu, J.; Cheng, J. X.; Kerr, G.
It is well known that two-ribbon flares observed in Hα and ultraviolet (UV) wavelengths mostly exhibit compact and localized hard X-ray (HXR) sources. In this paper, we present comprehensive analysis of a two-ribbon flare observed in UV 1600 Å by Transition Region and Coronal Explorer and in HXRs by Reuven Ramaty High Energy Solar Spectroscopic Im…
Dune fields on Mars: Recorders of a climate change?
Quantin, Cathy; Silvestro, Simone; Gardin, Emilie +2 more
Dunes have similar morphologies on the Earth and Mars. The main differences between Martian and terrestrial dunes are their size, which is larger on Mars, and their duration of formation, which is longer on Mars. As the characteristic time of Martian dunes is in the same order as that of the Martian climatic oscillations, Martian dunes could be re…
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…