Search Publications
The Shaping of the Multipolar Pre-planetary Nebula CRL 618 by Multidirectional Bullets
Lee, Chin-Fei; Moraghan, Anthony; Smith, Michael +1 more
In order to understand the formation of the multipolar structures of the pre-planetary nebula CRL 618, we perform 3D simulations using a multidirectional bullet model. The optical lobes of CRL 618 and fast molecular outflows at the tips of the lobes have been found to have similar expansion ages of ∼100 yr. Additional fast molecular outflows were …
GW Librae: a unique laboratory for pulsations in an accreting white dwarf
Knigge, C.; Hermes, J. J.; Gänsicke, B. T. +22 more
Non-radial pulsations have been identified in a number of accreting white dwarfs in cataclysmic variables. These stars offer insight into the excitation of pulsation modes in atmospheres with mixed compositions of hydrogen, helium, and metals, and the response of these modes to changes in the white dwarf temperature. Among all pulsating cataclysmi…
The CHARA Array resolves the long-period Wolf-Rayet binaries WR 137 and WR 138
Gies, Douglas R.; Moffat, Anthony F. J.; Richardson, Noel D. +10 more
We report on interferometric observations with the CHARA Array of two classical Wolf-Rayet (WR) stars in suspected binary systems, namely WR 137 and WR 138. In both cases, we resolve the component stars to be separated by a few milliarcseconds. The data were collected in the H band, and provide a measure of the fractional flux for both stars in ea…
Modeling the shock-cloud interaction in SN 1006: Unveiling the origin of nonthermal X-ray and γ-ray emission
Miceli, M.; Decourchelle, A.; Orlando, S. +9 more
Context. The supernova remnant SN 1006 is a source of high-energy particles and its southwestern limb is interacting with a dense ambient cloud, thus is a promising region for γ-ray hadronic emission.
Aims: We aim at describing the physics and the nonthermal emission associated with the shock-cloud interaction to derive the physical parameter…
Chandra Observations of Eight Sources Discovered by INTEGRAL
Rahoui, Farid; Fornasini, Francesca M.; Bodaghee, Arash +5 more
We report on 0.3-10 keV observations with the Chandra X-ray Observatory of eight hard X-ray sources discovered within 8° of the Galactic plane by the International Gamma-ray Astrophysics Laboratory satellite. The short (∼5 ks) Chandra observations of the IGR source fields have yielded very likely identifications of X-ray counterparts for three of …
Characterization of the permittivity of controlled porous water ice-dust mixtures to support the radar exploration of icy bodies
Thomas, N.; Brouet, Y.; Pommerol, A. +6 more
The internal properties of porous and icy bodies in the solar system can be investigated by ground-penetrating radars (GPRs), like the COmet Nucleus Sounding Experiment by Radiowave Transmission instrument on board the Rosetta spacecraft which has sounded the interior of the nucleus of comet 67P/Churyumov-Gerasimenko. Accurate constraints on the p…
Carbon monoxide observed in Venus' atmosphere with SOIR/VEx
Vandaele, A. C.; Thomas, I. R.; Trompet, L. +6 more
The SOIR instrument on board the ESA Venus Express mission has been operational during the complete duration of the mission, from April 2006 up to December 2014. Spectra were recorded in the IR spectral region (2.2-4.3 µm) using the solar occultation geometry, giving access to a vast number of ro-vibrational lines and bands of several key sp…
GIADA - Grain Impact Analyzer and Dust Accumulator - Onboard Rosetta spacecraft: Extended calibrations
Fulle, M.; Rodriguez, J.; Colangeli, L. +12 more
Despite a long tradition of dust instruments flown on-board space mission, the largest number of these can be considered unique as they used different detection techniques. GIADA (Grain Impact Analyzer and Dust Accumulator), is one of the dust instruments on-board the Rosetta spacecraft and is devoted to measure the dust dynamical parameters in th…
First detection of cosmic microwave background lensing and Lyman-α forest bispectrum
Spergel, David N.; Schaan, Emmanuel; Ganga, Ken +4 more
We present the first detection of a correlation between the Lyman-α forest and cosmic microwave background gravitational lensing. For each Lyman-α forest in SDSS-III/BOSS DR12, we correlate the one-dimensional power spectrum with the cosmic microwave background lensing convergence on the same line of sight from Planck. This measurement constitutes…
Imaging an 80 au Radius Dust Ring around the F5V Star HD 157587
Matthews, Brenda C.; Duchêne, Gaspard; Esposito, Thomas M. +55 more
We present H-band near-infrared polarimetric imaging observations of the F5V star HD 157587 obtained with the Gemini Planet Imager (GPI) that reveal the debris disk as a bright ring structure at a separation of ∼80-100 au. The new GPI data complement recent Hubble Space Telescope/STIS observations that show the disk extending out to over 500 au. T…