Search Publications
Nitrogen hydrides in the cold envelope of IRAS 16293-2422
Falgarone, E.; Maret, S.; Henning, T. +58 more
Nitrogen is the fifth most abundant element in the Universe, yet the gas-phase chemistry of N-bearing species remains poorly understood. Nitrogen hydrides are key molecules of nitrogen chemistry. Their abundance ratios place strong constraints on the production pathways and reaction rates of nitrogen-bearing molecules. We observed the class 0 prot…
The Herschel Virgo Cluster Survey . VII. Dust in cluster dwarf elliptical galaxies
Bomans, D. J.; Bianchi, S.; Fritz, J. +27 more
We use the science demonstration phase data of the Herschel Virgo Cluster Survey to search for dust emission of early-type dwarf galaxies in the central regions of the Virgo cluster as an alternative way of identifying the interstellar medium. We present the first possible far-infrared detection of cluster early-type dwarf galaxies: VCC 781 and VC…
White Dwarf-Red Dwarf Systems Resolved with the Hubble Space Telescope. II. Full Snapshot Survey Results
Hoard, D. W.; Farihi, J.; Wachter, S.
Results are presented for a Hubble Space Telescope Advanced Camera for Surveys high-resolution imaging campaign of 90 white dwarfs with known or suspected low-mass stellar and substellar companions. Of the 72 targets that remain candidate and confirmed white dwarfs with near-infrared excess, 43 are spatially resolved into two or more components, a…
Modeling the Outflow in the Narrow-line Region of Markarian 573: Biconical Illumination of a Gaseous Disk
Kraemer, S. B.; Crenshaw, D. M.; Schmitt, H. R. +2 more
We present a study of the outflowing ionized gas in the resolved narrow-line region of the Seyfert 2 galaxy Mrk 573, and its interaction with an inner dust/gas disk, based on Hubble Space Telescope (HST) Wide Field Planetary Camera 2 and Space Telescope Imaging Spectrograph observations. From the spectroscopic and imaging information, we determine…
Discovery of a strong magnetic field in the rapidly rotating B2Vn star HR 7355
Manset, N.; Wade, G. A.; Marcolino, W. L. F. +5 more
We report the detection of a strong, organized magnetic field in the He-variable early B-type star HR 7355 using spectropolarimetric data obtained with ESPaDOnS on the 3.6-m Canada-France-Hawaii Telescope within the context of the Magnetism in Massive Stars (MiMeS) Large Program. HR 7355 is both the most rapidly rotating known main-sequence magnet…
Near-infrared survey of high mass X-ray binary candidates
Torrejón, J. M.; Negueruela, I.; Smith, D. M. +1 more
Context. The INTEGRAL satellite is detecting a large population of new X-ray sources that were missed by previous missions because of high obscuration and, in some cases, very short duty cycles. The nature of these sources must be addressed by characterizing their optical and/or infrared counterparts.
Aims: We investigate the nature of the op…
Transterminator ion flow in the Martian ionosphere
Fedorov, A.; Barabash, S.; Lundin, R. +4 more
The upper ionospheres of Mars and Venus are permeated by the magnetic fields induced by the solar wind. It is a long-standing question whether these fields can put the dense ionospheric plasma into motion. If so, the transterminator flow of the upper ionosphere could explain a significant part of the ion escape from the planets atmospheres. But it…
Comparing eclipse observations of the 2008 August 1 solar corona with an MHD model prediction
Riley, P.; Linker, J. A.; Mikić, Z. +7 more
Context. The structure of the white-light and emission solar coronas and their MHD modelling are the context of our work.
Aims: A comparison is made between the structure of the solar corona as observed during the 2008 August 1 total eclipse from Mongolia and that predicted by an MHD model.
Methods: The model has an improved energy formu…
The supergiant fast X-ray transients XTE J1739-302 and IGR J08408-4503 in quiescence with XMM-Newton
Campana, S.; Israel, G.; Stella, L. +5 more
Context. Supergiant fast X-ray transients are a subclass of high mass X-ray binaries that host a neutron star accreting mass from the wind of its OB supergiant companion. They are characterized by an extremely pronounced and rapid variability in X-rays, which still lacks an unambiguous interpretation. A number of deep pointed observations with XMM…
A case study of EMIC wave-associated He+ energization in the outer magnetosphere: Cluster and Double Star 1 observations
Sauvaud, J. -A.; Klecker, B.; Kistler, L. M. +3 more
On December 4, 2004, the COmposition and DIstribution Function (CODIF) Analyzer on board the Cluster spacecraft observed a prolonged He+ energization event from 06:00 to 10:30 UT. In this paper, we perform a case study of the event by using in situ plasma and magnetic field measurements from the Cluster and Double Star Program (DSP) Tan…