Search Publications
The Merging of a Coronal Dimming and the Southern Polar Coronal Hole
Long, David M.; Baker, Deborah; Green, Lucie M. +4 more
We report on the merging between the southern polar coronal hole and an adjacent coronal dimming induced by a coronal mass ejection on 2022 March 18, resulting in the merged region persisting for at least 72 hr. We use remote sensing data from multiple co-observing spacecraft to understand the physical processes during this merging event. The evol…
Spectral analysis of basaltic asteroids observed by the Gaia space mission
Popescu, Marcel; Oszkiewicz, Dagmara; Carry, Benoit +4 more
There is a great deal of scientific interest in characterizing the basaltic asteroids (spectrally classified as V-types), as they are the key to understanding planetesimal formation and evolution in the early Solar system. These have long been recognized as parts of the crusts of fully differentiated planetesimals. Thus, their multiplicity, distri…
Search for Extremely Metal-poor Stars with Gemini-N/Graces. I. Chemical-abundance Analysis
Koo, Jae-Rim; Beers, Timothy C.; Lee, Young Sun +5 more
We present stellar parameters and abundances of 13 elements for 18 very metal-poor (VMP; [Fe/H] < –2.0) stars, selected as extremely metal-poor (EMP; [Fe/H] < –3.0) candidates from the Sloan Digital Sky Survey and Large sky Area Multi-Object Fiber Spectroscopic Telescope survey. High-resolution spectroscopic observations were performed using…
Reconstructing the extended structure of multiple sources strongly lensed by the ultra-massive elliptical galaxy SDSS J0100+1818
Grillo, C.; Christensen, L.; Suyu, S. H. +2 more
We study the total and baryonic mass distributions of the deflector SDSS J0100+1818 through a full strong lensing analysis. The system is composed of an ultra-massive early-type galaxy at z = 0.581, with a total stellar mass of (1.5 ± 0.3)×1012 M⊙ and a stellar velocity dispersion of (450 ± 40) km s−1, surrounded b…
The Kormendy relation of early-type galaxies as a function of wavelength in Abell S1063, MACS J0416.1-2403, and MACS J1149.5+2223
Grillo, C.; Rosati, P.; Vanzella, E. +9 more
Context. The wavelength dependence of the projection of the fundamental plane along the velocity dispersion axis, namely the Kormendy relation, is well characterised at low redshift but poorly studied at intermediate redshifts. The Kormendy relation provides information on the evolution of the population of early-type galaxies (ETGs). Therefore, b…
VLTI/GRAVITY Observations and Characterization of the Brown Dwarf Companion HD 72946 B
Lutz, D.; Genzel, R.; Sturm, E. +97 more
Tension remains between the observed and modeled properties of substellar objects, but objects in binary orbits, with known dynamical masses, can provide a way forward. HD 72946 B is a recently imaged brown dwarf companion to a nearby, solar-type star. We achieve ~100 µas relative astrometry of HD 72946 B in the K band using VLTI/GRAVITY, un…
Planets around evolved intermediate-mass stars. III. Planet candidates and long-term activity signals in six open clusters
Sousa, S. G.; Lovis, C.; Santos, N. C. +6 more
Context. We carried out a long-term campaign spanning 17 year to obtain high-precision radial velocities (RVs) with the HARPS spectrograph for a large sample of evolved stars in open clusters.
Aims: The aim of this work is to search for planets around evolved stars, with a special focus on stars more massive than 2 M⊙ in light of p…
Joint Modelling of Dust Scattering and Thermal Emission: The Spider Complex
van Dokkum, Pieter; Abraham, Roberto; Merritt, Allison +4 more
Observations across the electromagnetic spectrum of radiative processes involving interstellar dust-emission, absorption, and scattering-are used to constrain the parameters of dust models and more directly to aid in foreground removal of dust for extragalactic and cosmological observations. Dust models can benefit from more independent constraint…
SoloHI observations of coronal mass ejections observed by multiple spacecraft
Howard, R. A.; Hess, P.; Stenborg, G. +2 more
Context. The Solar Orbiter Heliospheric Imager (SoloHI) instrument of the Solar Orbiter mission is a next-generation heliospheric imager. New observations from SoloHI demonstrate the improved spatial and temporal resolution compared to previous observations of the heliosphere and corona. At perihelion, the field of view (FoV) of SoloHI covers the …
On the Hunt for the Origins of the Orphan-Chenab Stream: Detailed Element Abundances with APOGEE and Gaia
Laporte, Chervin F. P.; Price-Whelan, Adrian M.; Erkal, Denis +8 more
Stellar streams in the Galactic halo are useful probes of the assembly of galaxies like the Milky Way. Many tidal stellar streams that have been found in recent years are accompanied by a known progenitor globular cluster or dwarf galaxy. However, the Orphan-Chenab (OC) stream is one case where a relatively narrow stream of stars has been found wi…