Search Publications
Ruprecht 106: A Riddle, Wrapped in a Mystery, inside an Enigma
Milone, Antonino P.; Conroy, Charlie; Dotter, Aaron +2 more
Galactic globular clusters (GCs) show overwhelming photometric and spectroscopic evidence for the existence of multiple stellar populations. The question of whether or not there exists a GC that represents a true “simple stellar population” remains open. Here we focus on Ruprecht 106 (R106), a halo GC with [Fe/H] = -1.5 and [α/Fe] ≃0. A previous s…
A Young Ultramassive White Dwarf in the AB Doradus Moving Group
Faherty, Jacqueline K.; Gagné, Jonathan; Fontaine, Gilles +1 more
We use Gaia Data Release 2 (DR2) kinematic data and white dwarf evolutionary models to determine that the young and ultramassive 1.28 ± 0.08 M ⊙ white dwarf GD 50 is a likely member of the AB Doradus moving group (ABDMG). Comparison with the Montréal white dwarf evolutionary models and the MESA Isochrones and Stellar Tracks (MIST) main-…
Coronal Elemental Abundances in Solar Emerging Flux Regions
Long, David M.; Warren, Harry P.; Brooks, David H. +5 more
The chemical composition of solar and stellar atmospheres differs from the composition of their photospheres. Abundances of elements with low first ionization potential (FIP) are enhanced in the corona relative to high-FIP elements with respect to the photosphere. This is known as the FIP effect and it is important for understanding the flow of ma…
V1369 Cen High-resolution Panchromatic Late Nebular Spectra in the Context of a Unified Picture for Nova Ejecta
Izzo, Luca; Shore, Steven N.; Schwarz, Greg J. +3 more
Nova Cen 2013 (V1369 Cen) is the fourth bright nova observed panchromatically through high-resolution UV+optical multiepoch spectroscopy. It is also the nova with the richest set of spectra (in terms of both data quality and number of epochs) thanks to its exceptional brightness. Here, we use the late nebular spectra taken between day ∼250 and day…
Extended Structures of Planetary Nebulae Detected in H2 Emission
Zhang, Yong; Kwok, Sun; Guerrero, Martín A. +4 more
We present narrowband near-infrared images of a sample of 11 Galactic planetary nebulae (PNe) obtained in the H2 2.122 µm and Brγ 2.166 µm emission lines and the K c 2.218 µm continuum. These images were collected with the Wide-field Infrared Camera on the 3.6 m Canada-France-Hawaii Telescope (CFHT); their u…
The Dual Role of Starbursts and Active Galactic Nuclei in Driving Extreme Molecular Outflows
Bizzocchi, Luca; González-Alfonso, Eduardo; Darling, Jeremy +7 more
We report molecular gas observations of IRAS 20100-4156 and IRAS 03158+4227, two local ultraluminous infrared galaxies (ULIRGs) hosting some of the fastest and most massive molecular outflows known. Using Atacama Large Millimeter Array and Plateau de Bure Interferometer observations, we spatially resolve the CO (1-0) emission from the outflowing m…
On the Rate and on the Gravitational Wave Emission of Short and Long GRBs
Rodriguez, J.; Wang, Y.; Barres de Almeida, U. +13 more
On the ground of the large number of gamma-ray bursts (GRBs) detected with cosmological redshift, we classified GRBs in seven subclasses, all with binary progenitors which emit gravitational waves (GWs). Each binary is composed of combinations of carbon-oxygen cores (COcore), neutron stars (NSs), black holes (BHs), and white dwarfs (WDs…
RELICS: Strong Lensing Analysis of the Galaxy Clusters Abell S295, Abell 697, MACS J0025.4-1222, and MACS J0159.8-0849
Ouchi, Masami; Mahler, Guillaume; Bradač, Maruša +37 more
We present a strong lensing analysis of four massive galaxy clusters imaged with the Hubble Space Telescope in the Reionization Lensing Cluster Survey. We use a light-traces-mass technique to uncover sets of multiple images and constrain the mass distribution of the clusters. These mass models are the first published for Abell S295 and MACS J0159.…
On the Dynamic Nature of a Quiescent Prominence Observed by IRIS and MSDP Spectrographs
Schmieder, Brigitte; Chen, Yao; Labrosse, Nicolas +4 more
Quiescent solar prominences are generally considered to have a stable large-scale structure. However, they consist of multiple small-scale structures that are often significantly dynamic. To understand the nature of prominence plasma dynamics we use the high spatial, temporal, and spectral resolution observations obtained by Interface Region Imagi…
The Temporal Development of Dust Formation and Destruction in Nova Sagittarii 2015#2 (V5668 SGR): A Panchromatic Study
Krautter, Joachim; Gehrz, R. D.; Shore, S. N. +15 more
We present 5-28 µm SOFIA FORECAST spectroscopy complemented by panchromatic X-ray through infrared observations of the CO nova V5668 Sgr documenting the formation and destruction of dust during ∼500 days following outburst. Dust condensation commenced by 82 days after outburst at a temperature of ∼1090 K. The condensation temperature indicat…