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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…
Multi-wavelength observations of IGR J17544-2619 from quiescence to outburst
Campana, S.; Stella, L.; Chaty, S. +12 more
In this paper we report on a long multi-wavelength observational campaign of the supergiant fast X-ray transient prototype IGR J17544-2619. A 150 ks-long observation was carried out simultaneously with XMM-Newton and NuSTAR, catching the source in an initial faint X-ray state and then undergoing a bright X-ray outburst lasting approximately 7 ks. …
Small particles and self-gravity wakes in Saturn's rings from UVIS and VIMS stellar occultations
Nicholson, Philip D.; Hedman, Matthew M.; Colwell, Joshua E. +2 more
The distribution of particle sizes in Saturn's rings roughly follows a truncated inverse power-law. Though it is well known that differential optical depths provide a way to probe the parameters of size distribution (i.e. Zebker et al. [1985] Icarus, 64, 531-548), the technique is complicated by the presence of self-gravity wakes which introduce a…
Morphological evolution of cluster red sequence galaxies in the past 9 Gyr
De Propris, Roberto; Phillipps, Steven; Bremer, Malcolm N.
Galaxies arrive on the red sequences of clusters at high redshift (z > 1) once their star formation is quenched and evolve passively thereafter. However, we have previously found that cluster red sequence galaxies (CRSGs) undergo significant morphological evolution subsequent to the cessation of star formation, at some point in the past 9-10 Gy…
Magnetic field geometry of an unusual cometary cloud Gal 110-13
Neha, S.; Soam, A.; Maheswar, G. +2 more
Aims: We carried out optical polarimetry of an isolated cloud, Gal 110-13, to map the plane-of-the-sky magnetic field geometry. The main aim of the study is to understand the most plausible mechanism responsible for the unusual cometary shape of the cloud in the context of its magnetic field geometry.
Methods: When unpolarized starlight …
Luminous blue variables: An imaging perspective on their binarity and near environment
Rivinius, Thomas; Baade, Dietrich; Mérand, Antoine +18 more
Context. Luminous blue variables (LBVs) are rare massive stars with very high luminosity. They are characterized by strong photometric and spectroscopic variability related to transient eruptions. The mechanisms at the origin of these eruptions is not well known. In addition, their formation is still problematic and the presence of a companion cou…
EXTraS discovery of an 1.2-s X-ray pulsar in M 31
Salvaterra, R.; Haberl, F.; Read, A. M. +13 more
During a search for coherent signals in the X-ray archival data of XMM-Newton, we discovered a modulation at 1.2 s in 3XMM J004301.4+413017 (3X J0043), a source lying in the direction of an external arm of M 31. This short period indicates a neutron star (NS). Between 2000 and 2013, the position of 3X J0043 was imaged by public XMM-Newton observat…