Search Publications
A Herschel resolved far-infrared dust ring around HD 207129
Fridlund, M.; Krivov, A. V.; Eiroa, C. +26 more
Context. Dusty debris discs around main sequence stars are thought to be the result of continuous collisional grinding of planetesimals in the system. The majority of these systems are unresolved and analysis of the dust properties is limited by the lack of information regarding the dust location.
Aims: The Herschel DUNES key program is obser…
Evolution of Currents of Opposite Signs in the Flare-productive Solar Active Region NOAA 10930
Tiwari, Sanjiv Kumar; Venkatakrishnan, P.; Ravindra, B. +1 more
Analysis of a time series of high spatial resolution vector magnetograms of the active region NOAA 10930 available from the Solar Optical Telescope SpectroPolarimeter on board Hinode revealed that there is a mixture of upward and downward currents in the two footpoints of an emerging flux rope. The flux emergence rate is almost the same in both th…
The UDF05 Follow-up of the Hubble Ultra Deep Field. III. The Luminosity Function at z ~ 6
Ferguson, Henry C.; Giavalisco, Mauro; Lucas, Ray A. +13 more
In this paper, we present a derivation of the rest-frame 1400 Å luminosity function (LF) at redshift six from a new application of the maximum likelihood method by exploring the five deepest Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) fields, i.e., the Hubble Ultra Deep Field, two UDF05 fields, and two Great Observatories Origins …
Herschel-ATLAS: statistical properties of Galactic cirrus in the GAMA-9 Hour Science Demonstration Phase Field
Rodighiero, G.; Ivison, R. J.; Clements, D. L. +35 more
We study the spectral energy distribution (SED) and the power spectrum of Galactic cirrus emission observed in the 14 deg2 Science Demonstration Phase field of the Herschel-ATLAS using Herschel and IRAS data from 100 to 500 µm. We compare the Spectral and Photometric Imaging Receiver (SPIRE) 250, 350 and 500 µm maps with IRA…
Current sheets from Ulysses observation
Li, G.; Miao, B.; Peng, B.
Current sheet is a significant source of solar wind MHD turbulence intermittency. It has long been recognized that these structures can arise from non-linear interactions of MHD turbulence. Alternatively, they may also be relic structures in the solar wind that have a solar origin, e.g., magnetic walls of flux tubes that separate solar wind plasma…
Revisiting two-step Forbush decreases
Spence, H. E.; Blake, J. B.; Jordan, A. P. +1 more
Interplanetary coronal mass ejections (ICMEs) and their shocks can sweep out galactic cosmic rays (GCRs), thus creating Forbush decreases (FDs). The traditional model of FDs predicts that an ICME and its shock decrease the GCR intensity in a two-step profile. This model, however, has been the focus of little testing. Thus, our goal is to discover …
Transiting exoplanets from the CoRoT space mission. XVIII. CoRoT-18b: a massive hot Jupiter on a prograde, nearly aligned orbit
Mazeh, T.; Aigrain, S.; Alonso, R. +44 more
We report the detection of CoRoT-18b, a massive hot Jupiter transiting in front of its host star with a period of 1.9000693 ± 0.0000028 days. This planet was discovered thanks to photometric data secured with the CoRoT satellite combined with spectroscopic and photometric ground-based follow-up observations. The planet has a mass Mp = 3…
Sulfates and iron oxides in Ophir Chasma, Mars, based on OMEGA and CRISM observations
Neukum, Gerhard; Combe, Jean-Philippe; Gross, Christoph +5 more
We investigate the sulfate and iron oxide deposits in Ophir Chasma, Mars, based on short-wave infrared data from the Compact Reconnaissance Imaging Spectrometer for Mars - CRISM and from the Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité - OMEGA. Sulfates are detected mainly in two locations. In the valley between Ophir Mensa an…
Magnetosphere-ionosphere coupling in Jupiter's middle magnetosphere: Computations including a self-consistent current sheet magnetic field model
Nichols, J. D.
In this paper we consider the effect of a self-consistently computed magnetodisc field structure on the magnetosphere-ionosphere coupling current system at Jupiter. We find that the azimuthal current intensity, and thus the stretching of the magnetic field lines, is dependent on the magnetosphere-ionosphere coupling current system parameters, i.e.…
Optical Properties of the Ultraluminous X-Ray Source Holmberg IX X-1 and Its Stellar Environment
Motch, C.; Kaaret, P.; Pakull, M. W. +1 more
Holmberg IX X-1 is an archetypal ultraluminous X-ray source (ULX). Here we study the properties of the optical counterpart and of its stellar environment using optical data from SUBARU/Faint Object Camera and Spectrograph, GEMINI/GMOS-N and Hubble Space Telescope (HST)/Advanced Camera for Surveys, as well as simultaneous Chandra X-ray data. The V …