Search Publications
Progenitor and close-in circumstellar medium of type II supernova 2020fqv from high-cadence photometry and ultra-rapid UV spectroscopy
Pérez-Fournon, I.; Poidevin, F.; Shirley, R. +35 more
We present observations of SN 2020fqv, a Virgo-cluster type II core-collapse supernova (CCSN) with a high temporal resolution light curve from the Transiting Exoplanet Survey Satellite (TESS) covering the time of explosion; ultraviolet (UV) spectroscopy from the Hubble Space Telescope (HST) starting 3.3 d post-explosion; ground-based spectroscopic…
The early Universe was dust-rich and extremely hot
Moncelsi, Lorenzo; Sun, Guochao; Viero, Marco P. +2 more
We investigate the dust properties and star-formation signature of galaxies in the early Universe by stacking 111 227 objects in the recently released COSMOS catalogue on maps at wavelengths bracketing the peak of warmed dust emission. We find an elevated far-infrared luminosity density to redshift 8, indicating abundant dust in the early Universe…
Triply eclipsing triple stars in the northern TESS fields: TICs 193993801, 388459317, and 52041148
Mitnyan, T.; Pál, A.; Vanderburg, A. +23 more
In this work we report the discovery and analysis of three new triply eclipsing triple star systems found with the TESS mission during its observations of the northern skies: TICs 193993801, 388459317, and 52041148. We utilized the TESS precision photometry of the binary eclipses and third-body eclipsing events, ground-based archival and follow-up…
Star formation characteristics of CNN-identified post-mergers in the Ultraviolet Near Infrared Optical Northern Survey (UNIONS)
Ellison, Sara L.; Gwyn, Stephen; Hudson, Michael J. +3 more
The importance of the post-merger epoch in galaxy evolution has been well documented, but post-mergers are notoriously difficult to identify. While the features induced by mergers can sometimes be distinctive, they are frequently missed by visual inspection. In addition, visual classification efforts are highly inefficient because of the inherent …
Statistics of galaxy mergers: bridging the gap between theory and observation
Baugh, Carlton M.; Lacey, Cedric G.; Huško, Filip
We present a study of galaxy mergers up to z = 10 using the Planck Millennium cosmological dark matter simulation and the GALFORM semi-analytical model of galaxy formation. Utilizing the full 800 Mpc3 volume of the simulation, we studied the statistics of galaxy mergers in terms of merger rates and close pair fractions. We predict that …
Planetary nebula luminosity function distances for 19 galaxies observed by PHANGS-MUSE
Van Dyk, Schuyler D.; Kruijssen, J. M. Diederik; Rosolowsky, Erik +15 more
We provide new planetary nebula luminosity function (PNLF) distances to 19 nearby spiral galaxies that were observed with VLT/MUSE by the PHANGS collaboration. Emission line ratios are used to separate planetary nebulae (PNe) from other bright $[\mathrm{O}\, {\small III}]$ emitting sources like compact supernovae remnants (SNRs) or H II regions. W…
The bright extragalactic ALMA redshift survey (BEARS) I: redshifts of bright gravitationally lensed galaxies from the Herschel ATLAS
Berta, S.; Andreani, P.; Omont, A. +53 more
We present spectroscopic measurements for 71 galaxies associated with 62 of the brightest high-redshift submillimetre sources from the Southern fields of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS), while targeting 85 sources which resolved into 142. We have obtained robust redshift measurements for all sources using the 12-m …
No evidence for a strong decrease of planetesimal accretion in old white dwarfs
Blouin, Simon; Xu, Siyi
A large fraction of white dwarfs are accreting or have recently accreted rocky material from their planetary systems, thereby 'polluting' their atmospheres with elements heavier than helium. In recent years, the quest for mechanisms that can deliver planetesimals to the immediate vicinity of their central white dwarfs has stimulated a flurry of mo…
Measuring sloshing, merging, and feedback velocities in the Virgo cluster
Fabian, A. C.; Pinto, C.; Sanders, J. S. +5 more
We present a detailed analysis of the velocity structure of the Virgo cluster using XMM-Newton observations. Using a novel technique which uses the Cu K α instrumental line to calibrate the EPIC-pn energy scale, we are able to obtain velocity measurements with uncertainties down to Δv ~ 100 km s-1. We created 2D projected maps for the v…
Identifying resonances of the Galactic bar in Gaia DR2: II. Clues from angle space
Trick, Wilma H.
The Milky Way disc exhibits intricate orbit substructure of still debated dynamical origin. The angle variables (θϕ, θR) - which are conjugates to the actions (L$z$, JR), and describe a star's location along its orbit - are a powerful diagnostic to identify l:m resonances via the orbit shape relation Δθ<…