Search Publications
Cosmological constraints on neutrino self-interactions with a light mediator
Lattanzi, Massimiliano; Natoli, Paolo; Forastieri, Francesco
If active neutrinos undergo nonstandard ("secret") interactions (NS ν Is ), the cosmological evolution of the neutrino fluid might be altered, leaving an imprint in cosmological observables. We use the latest publicly available CMB data from Planck to constrain NS ν Is inducing ν -ν scattering, under the assumption that the mediator ϕ of the secre…
An emission spectrum for WASP-121b measured across the 0.8-1.1 µm wavelength range using the Hubble Space Telescope
Deming, Drake; Nikolov, Nikolay; Carter, Aarynn L. +11 more
WASP-121b is a transiting gas giant exoplanet orbiting close to its Roche limit, with an inflated radius nearly double that of Jupiter and a dayside temperature comparable to a late M dwarf photosphere. Secondary eclipse observations covering the 1.1-1.6 µm wavelength range have revealed an atmospheric thermal inversion on the dayside hemisp…
Half-mass Radii of Quiescent and Star-forming Galaxies Evolve Slowly from 0 ≲ z ≤ 2.5: Implications for Galaxy Assembly Histories
Barro, Guillermo; Kriek, Mariska; Price, Sedona H. +1 more
We use high-resolution, multiband imaging of ∼16,500 galaxies in the CANDELS fields at 0 ≲ z ≤ 2.5 to study the evolution of color gradients and half-mass radii over cosmic time. We find that galaxy color gradients at fixed mass evolve rapidly between z ∼ 2.5 and z ∼ 1, but remain roughly constant below z ∼ 1. This result implies that the sizes of…
Probing 3D structure with a large MUSE mosaic: extending the mass model of Frontier Field Abell 370
Carton, David; Mahler, Guillaume; Richard, Johan +12 more
We present an updated strong-lensing analysis of the massive cluster Abell 370 (A370), continuing the work first presented in L17. In this new analysis, we take advantage of the deeper imaging data from the Hubble Space Telescope Frontier Fields programme, as well as a large spectroscopic mosaic obtained with the Multi-Unit Spectroscopic Explorer …
A Model-independent Mass and Moderate Eccentricity for β Pic b
Kratter, Kaitlin M.; Dupuy, Trent J.; Bowler, Brendan P. +1 more
We use a cross-calibration of Hipparcos and Gaia second data release astrometry for β Pic to measure the mass of the giant planet β Pic b (13 ± 3 {M}Jup}) in a comprehensive joint orbit analysis that includes published relative astrometry and radial velocities. Our mass uncertainty is somewhat higher than previous work because our astro…
On High-energy Particles in Accretion Disk Coronae of Supermassive Black Holes: Implications for MeV Gamma-rays and High-energy Neutrinos from AGN Cores
Inoue, Susumu; Inoue, Yoshiyuki; Doi, Akihiro +1 more
Recent observations with ALMA have revealed evidence for nonthermal synchrotron emission from the core regions of two nearby Seyfert galaxies. This suggests that the coronae of accretion disks in active galactic nuclei (AGNs) can be conducive to the acceleration of nonthermal electrons, in addition to the hot, thermal electrons responsible for the…
Compositions of Planetary Debris around Dusty White Dwarfs
Zuckerman, B.; Dufour, Patrick; Xu, Siyi +5 more
The photospheres of some white dwarfs (WDs) are “polluted” by accretion of material from their surrounding planetary debris. WDs with dust disks are often heavily polluted and high-resolution spectroscopic observations of these systems can be used to infer the chemical compositions of extrasolar planetary material. Here, we report spectroscopic ob…
Globular cluster number density profiles using Gaia DR2
Balbinot, E.; Hénault-Brunet, V.; Gieles, M. +4 more
Using data from Gaia DR2, we study the radial number density profiles of the Galactic globular cluster sample. Proper motions are used for accurate membership selection, especially crucial in the cluster outskirts. Due to the severe crowding in the centres, the Gaia data are supplemented by literature data from HST and surface brightness measureme…
Kinematic Detections of Protoplanets: A Doppler Flip in the Disk of HD 100546
Pérez, Sebastián; Casassus, Simon
Protoplanets and circumplanetary disks are rather elusive in their thermal IR emission. Yet they are cornerstones to the most popular interpretations for the protoplanetary disk structures observed in the gas and dust density fields, even though alternative theories exist. The gaseous velocity field should also bear the imprint of planet-disk inte…
Dust of comet 67P/Churyumov-Gerasimenko collected by Rosetta/MIDAS: classification and extension to the nanometer scale
Ehrenfreund, P.; Bentley, M. S.; Mannel, T. +9 more
Context. The properties of the smallest subunits of cometary dust contain information on their origin and clues to the formation of planetesimals and planets. Compared to interplanetary dust particles or particles collected during the Stardust mission, dust collected in the coma of comet 67P/Churyumov-Gerasimenko (67P) during the Rosetta mission p…