Search Publications
Cosmology with photometric weak lensing surveys: Constraints with redshift tomography of convergence peaks and moments
Haiman, Zoltán; May, Morgan; Petri, Andrea
Weak gravitational lensing is becoming a mature technique for constraining cosmological parameters, and future surveys will be able to constrain the dark energy equation of state w . When analyzing galaxy surveys, redshift information has proven to be a valuable addition to angular shear correlations. We forecast parameter constraints on the tripl…
Geologic mapping of the Comet 67P/Churyumov-Gerasimenko's Northern hemisphere
Jorda, L.; Lamy, P. L.; Lara, L. M. +52 more
The Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS), the scientific imaging system onboard the Rosetta mission, has been acquiring images of the nucleus of the comet 67P/Churyumov-Gerasimenko since 2014 August with a resolution which allows a detailed analysis of its surface. Indeed, data reveal a complex surface morphology whi…
On the Spin of the Black Hole in IC 10 X-1
Steiner, James F.; McClintock, Jeffrey E.; Middleton, Matthew J. +5 more
The compact X-ray source in the eclipsing X-ray binary IC 10 X-1 has reigned for years as ostensibly the most massive stellar-mass black hole, with a mass estimated to be about twice that of its closest rival. However, striking results presented recently by Laycock et al. reveal that the mass estimate, based on emission-line velocities, is unrelia…
Stratified NH and ND emission in the prestellar core 16293E in L1689N
Ceccarelli, C.; Caux, E.; Daniel, F. +6 more
Context. High degrees of deuterium fractionation are commonly found in cold prestellar cores and in the envelopes around young protostars. As it brings strong constraints to chemical models, deuterium chemistry is often used to infer core history or molecule formation pathways. Whereas a large number of observations are available regarding interst…
Spectrophotometry of the Khonsu region on the comet 67P/Churyumov-Gerasimenko using OSIRIS instrument images
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +47 more
Our work focuses on the spectrophotometric analysis of selected terrain and bright patches in the Khonsu region on the comet 67P/Churyumov-Gerasimenko. Despite the variety of geological features, their spectrophotometric properties appear to indicate a similar composition. It is noticeable that the smooth areas in Khonsu possess similar spectropho…
Probing dark matter crests with white dwarfs and IMBHs
Schödel, R.; Amaro-Seoane, P.; Casanellas, J. +2 more
White dwarfs (WDs) are the most promising captors of dark matter (DM) particles in the crests that are expected to build up in the cores of dense stellar clusters. The DM particles could reach sufficient densities in WD cores to liberate energy through self-annihilation. The extinction associated with our Galactic Centre makes it impossible to det…
Herschel Observations of Dusty Debris Disks
Zuckerman, B.; Song, Inseok; Melis, Carl +4 more
We present results from two Herschel observing programs using the Photodetector Array Camera and Spectrometer. During three separate campaigns, we obtained Herschel data for 24 stars at 70, 100, and 160 µm. We chose stars that were already known or suspected to have circumstellar dust based on excess infrared (IR) emission previously measure…
The far-infrared behaviour of Herbig Ae/Be discs: Herschel PACS photometry
Marshall, J. P.; Montesinos, B.; Mendigutía, I. +3 more
Herbig Ae/Be objects are pre-main sequence stars surrounded by gas- and dust-rich circumstellar discs. These objects are in the throes of star and planet formation, and their characterisation informs us of the processes and outcomes of planet formation processes around intermediate mass stars. Here we analyse the spectral energy distributions of d…
The K2-ESPRINT Project IV. A Hot Jupiter in a Prograde Orbit with a Possible Stellar Companion
Tamura, Motohide; Hirano, Teruyuki; Sato, Bun'ei +19 more
We report on the detection and early characterization of a hot Jupiter in a three day orbit around K2-34 (EPIC 212110888), a metal-rich F-type star located in the K2 Cycle 5 field. Our follow-up campaign involves precise radial velocity (RV) measurements and high-contrast imaging using multiple facilities. The absence of a bright nearby source in …
Herschel Spectroscopic Observations of Little Things Dwarf Galaxies
Lebouteiller, Vianney; Schruba, Andreas; Cormier, Diane +8 more
We present far-infrared (FIR) spectral line observations of five galaxies from the Little Things sample: DDO 69, DDO 70, DDO 75, DDO 155, and WLM. While most studies of dwarfs focus on bright systems or starbursts due to observational constraints, our data extend the observed parameter space into the regime of low surface brightness dwarf galaxies…