Search Publications
Inner disk clearing around the Herbig Ae star HD 139614: Evidence for a planet-induced gap?
Thi, W. F.; Carmona, A.; Labadie, L. +8 more
Spatially resolving the inner dust cavity (or gap) of the so-called (pre-)transitional disks is a key to understanding the connection between the processes of planetary formation and disk dispersal. The disk around the Herbig star HD 139614 is of particular interest since it presents a pretransitional nature with an au-sized gap structure that is …
Evidence for Reflected Light from the Most Eccentric Exoplanet Known
Butler, R. Paul; Mahadevan, Suvrath; Henry, Gregory W. +16 more
Planets in highly eccentric orbits form a class of objects not seen within our solar system. The most extreme case known among these objects is the planet orbiting HD 20782, with an orbital period of 597 days and an eccentricity of 0.96. Here we present new data and analysis for this system as part of the Transit Ephemeris Refinement and Monitorin…
Planck intermediate results. XLV. Radio spectra of northern extragalactic radio sources
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +184 more
Continuum spectra covering centimetre to submillimetre wavelengths are presented for a northern sample of 104 extragalactic radio sources, mainly active galactic nuclei, based on four-epoch Planck data. The nine Planck frequencies, from 30 to 857 GHz, are complemented by a set of simultaneous ground-based radio observations between 1.1 and 37 GHz.…
IC 3639—a New Bona Fide Compton-Thick AGN Unveiled by NuSTAR
Harrison, F. A.; Stern, D.; Zhang, W. W. +19 more
We analyze high-quality NuSTAR observations of the local (z = 0.011) Seyfert 2 active galactic nucleus (AGN) IC 3639, in conjunction with archival Suzaku and Chandra data. This provides the first broadband X-ray spectral analysis of the source, spanning nearly two decades in energy (0.5-30 keV). Previous X-ray observations of the source below 10 k…
The Gaia spectrophotometric standard stars survey - III. Short-term variability monitoring
Jordi, C.; Figueras, F.; Marinoni, S. +14 more
We present the results of the short-term constancy monitoring of candidate Gaia Spectrophotometric Standard Stars (SPSS). We obtained time series of typically 1.24 h - with sampling periods from 1-3 min to a few hours, depending on the case - to monitor the constancy of our candidate SPSS down to 10 mmag, as required for the calibration of Gaia ph…
The Chandra ACIS Timing Survey Project: glimpsing a sample of faint X-ray pulsators
Sidoli, L.; Esposito, P.; Israel, G. L. +1 more
We report on the discovery of 41 new pulsating sources in the data of the Chandra Advanced CCD Imaging Spectrometer, which is sensitive to X-ray photons in the 0.3-10 keV band. The archival data of the first 15 yr of Chandra observations were retrieved and analysed by means of fast Fourier transforms, employing a peak-detection algorithm able to s…
Kinematics of symmetric Galactic longitudes to probe the spiral arms of the Milky Way with Gaia
Prusti, T.; Antoja, T.; de Bruijne, J. +1 more
Aims: We model the effects of the spiral arms of the Milky Way on the disk stellar kinematics in the Gaia observable space. We also estimate the Gaia capabilities of detecting the predicted signatures.
Methods: We use both controlled orbital integrations in analytic potentials and self-consistent simulations. We introduce a new strategy …
Modelling the structure and kinematics of the Firework nebula: The nature of the GK Persei nova shell and its jet-like feature
Boumis, P.; Akras, S.; Harvey, E. +1 more
Aims: The shaping mechanisms of old nova remnants are probes for several important and unexplained processes, such as dust formation and the structure of evolved star nebulae. To gain a more complete understanding of the dynamics of the GK Per (1901) remnant, an examination of symmetry of the nova shell is explored, followed by a kinematical …
The SLUGGS survey*: exploring the globular cluster systems of the Leo II group and their global relationships
Spitler, Lee R.; Forbes, Duncan A.; Romanowsky, Aaron J. +6 more
We present an investigation of the globular cluster (GC) systems of NGC 3607 and NGC 3608 as part of the ongoing SLUGGS (SAGES Legacy Unifying Globulars and GalaxieS) survey. We use wide-field imaging data from the Subaru telescope in the g, r and I filters to analyse the radial density, colour and azimuthal distributions of both GC systems. With …
Constraints on the Binary Companion to the SN Ic 1994I Progenitor
Van Dyk, Schuyler D.; de Mink, Selma E.; Zapartas, Emmanouil
Core-collapse supernovae (SNe), which mark the deaths of massive stars, are among the most powerful explosions in the universe and are responsible, e.g., for a predominant synthesis of chemical elements in their host galaxies. The majority of massive stars are thought to be born in close binary systems. To date, putative binary companions to the p…