Search Publications
Detection of frequency spacings in the young O-type binary HD 46149 from CoRoT photometry
Auvergne, M.; Baudin, F.; Poretti, E. +15 more
Aims: Using the CoRoT space based photometry of the O-type binary HD 46149, stellar atmospheric effects related to rotation can be separated from pulsations, because they leave distinct signatures in the light curve. This offers the possibility of characterising and exploiting any pulsations seismologically.
Methods: Combining high-quali…
Productivity of Solar Flares and Magnetic Helicity Injection in Active Regions
Wang, Haimin; Chae, Jongchul; Park, Sung-hong
The main objective of this study is to better understand how magnetic helicity injection in an active region (AR) is related to the occurrence and intensity of solar flares. We therefore investigate the magnetic helicity injection rate and unsigned magnetic flux, as a reference. In total, 378 ARs are analyzed using SOHO/MDI magnetograms. The 24 hr…
Deep high-resolution X-ray spectra from cool-core clusters
Fabian, A. C.; Russell, H. R.; Sanders, J. S. +2 more
We examine deep XMM-Newton Reflection Grating Spectrometer (RGS) spectra from the cores of three X-ray bright cool-core galaxy clusters, Abell 262, Abell 3581 and HCG 62. Each of the RGS spectra shows FeXVII emission lines indicating the presence of gas around 0.5keV. There is no evidence for OVII emission which would imply gas at still cooler tem…
Measures of star formation rates from infrared (Herschel) and UV (GALEX) emissions of galaxies in the HerMES fields
Altieri, B.; Aussel, H.; Elbaz, D. +75 more
The reliability of infrared (IR) and ultraviolet (UV) emissions to measure star formation rates (SFRs) in galaxies is investigated for a large sample of galaxies observed with the Spectral and Photometric Imaging Receiver (SPIRE) and the Photodetector Array Camera and Spectrometer (PACS) instruments on Herschel as part of the Herschel Multi-Tiered…
Meridional Circulation During the Extended Solar Minimum: Another Component of the Torsional Oscillation?
Howe, R.; Komm, R.; Hill, F. +1 more
We show here a component of the meridional circulation developing at medium-high latitudes (40°-50°) before the new solar cycle starts. Like the torsional oscillation of the zonal flows, this extra circulation seems to precede the onset of magnetic activity at the solar surface and moves slowly toward lower latitudes. However, the behavior of this…
HerMES: SPIRE Science Demonstration Phase maps†‡
Pérez-Fournon, I.; Franceschini, A.; Bock, J. +30 more
We describe the production and verification of sky maps of the five Spectral and Photometric Imaging Receiver (SPIRE) fields observed as part of the Herschel Multi-tiered Extragalactic Survey (HerMES) during the Science Demonstration Phase (SDP) of the Herschel mission. We have implemented an iterative map-making algorithm [The SPIRE-HerMES Iterat…
Titan haze distribution and optical properties retrieved from recent observations
Le Mouélic, S.; Rodriguez, S.; Sotin, C. +4 more
The VIMS instrument onboard Cassini observed the north polar region of Titan at 113° phase angle, 28 December 2006. On this spectral image, a vast polar cloud can be seen northward to 62°N, and elsewhere, the haze appears as the dominant source of scattering. Because the surface does not appear in the wavelength range between 0.3 and 4.9µm, …
Origin of Coronal Shock Waves Associated with Slow Coronal Mass Ejections
Zhukov, A. N.; Magdalenić, J.; Vršnak, B. +2 more
We present a multiwavelength study of five coronal mass ejection/flare events (CME/flare) and associated coronal shock waves manifested as type II radio bursts. The study is focused on the events in which the flare energy release, and not the associated CME, is the most probable source of the shock wave. Therefore, we selected events associated wi…
Transiting exoplanets from the CoRoT space mission. XI. CoRoT-8b: a hot and dense sub-Saturn around a K1 dwarf
Mazeh, T.; Guterman, P.; Aigrain, S. +47 more
Aims: We report the discovery of CoRoT-8b, a dense small Saturn-class exoplanet that orbits a K1 dwarf in 6.2 days, and we derive its orbital parameters, mass, and radius.
Methods: We analyzed two complementary data sets: the photometric transit curve of CoRoT-8b as measured by CoRoT and the radial velocity curve of CoRoT-8 as measured b…
Finding the Instability Strip for Accreting Pulsating White Dwarfs From Hubble Space Telescope and Optical Observations
Holtzman, Jon; Szkody, Paula; Howell, Steve B. +9 more
Time-resolved low resolution Hubble Space Telescope ultraviolet spectra together with ground-based optical photometry and spectra are used to constrain the temperatures and pulsation properties of six cataclysmic variables containing pulsating white dwarfs (WDs). Combining our temperature determinations for the five pulsating WDs that are several …