Search Publications
Stellar mass as a galaxy cluster mass proxy: application to the Dark Energy Survey redMaPPer clusters
Annis, J.; Brooks, D.; Burke, D. L. +83 more
We introduce a galaxy cluster mass observable, µ⋆, based on the stellar masses of cluster members, and we present results for the Dark Energy Survey (DES) Year 1 (Y1) observations. Stellar masses are computed using a Bayesian model averaging method, and are validated for DES data using simulations and COSMOS data. We show that &mi…
Satellites of Satellites: The Case for Carina and Fornax
Springel, Volker; Gómez, Facundo A.; Marinacci, Federico +6 more
We use the Auriga cosmological simulations of Milky Way (MW)-mass galaxies and their surroundings to study the satellite populations of dwarf galaxies in ΛCDM. As expected from prior work, the number of satellites above a fixed stellar mass is a strong function of the mass of the primary dwarf. For galaxies as luminous as the Large Magellanic Clou…
Insights into the planetary dynamics of HD 206893 with ALMA
Milli, J.; Zurlo, A.; Delorme, P. +8 more
Radial substructure in the form of rings and gaps has been shown to be ubiquitous among protoplanetary discs. This could be the case in exo-Kuiper belts as well, and evidence for this is emerging. In this paper, we present ALMA observations of the debris/planetesimal disc surrounding HD 206893, a system that also hosts two massive companions at 2 …
Mass determinations of the three mini-Neptunes transiting TOI-125
Bouchy, F.; Fridlund, M.; Rauer, H. +79 more
The Transiting Exoplanet Survey Satellite, TESS, is currently carrying out an all-sky search for small planets transiting bright stars. In the first year of the TESS survey, a steady progress was made in achieving the mission's primary science goal of establishing bulk densities for 50 planets smaller than Neptune. During that year, the TESS's obs…
Improving galaxy clustering measurements with deep learning: analysis of the DECaLS DR7 data
Ross, Ashley J.; Seo, Hee-Jong; Rezaie, Mehdi +1 more
Robust measurements of cosmological parameters from galaxy surveys rely on our understanding of systematic effects that impact the observed galaxy density field. In this paper, we present, validate, and implement the idea of adopting the systematics mitigation method of artificial neural networks for modelling the relationship between the target g…
The synthetic Emission Line COSMOS catalogue: Hα and [O II] galaxy luminosity functions and counts at 0.3 < z < 2.5
Ilbert, Olivier; Saito, Shun; Yabe, Kiyoto +3 more
Star-forming galaxies with strong nebular and collisional emission lines are privileged target galaxies in forthcoming cosmological large galaxy redshift surveys. We use the COSMOS2015 photometric catalogue to model galaxy spectral energy distributions and emission-line fluxes. We adopt an empirical but physically motivated model that uses informa…
WD1032 + 011, an inflated brown dwarf in an old eclipsing binary with a white dwarf
Hermes, J. J.; Winget, D. E.; Gänsicke, B. T. +11 more
We present the discovery of only the third brown dwarf known to eclipse a non-accreting white dwarf. Gaia parallax information and multicolour photometry confirm that the white dwarf is cool (9950 ± 150 K) and has a low mass (0.45 ± 0.05 M⊙), and spectra and light curves suggest the brown dwarf has a mass of 0.067 ± 0.006 M⊙ …
Effects of radiation pressure on the evaporative wind of HD 209458b
Murray-Clay, Ruth; Frank, Adam; Fossati, Luca +4 more
The role of radiation pressure in shaping exoplanet photoevaporation remains a topic of contention. Radiation pressure from the exoplanet's host star has been proposed as a mechanism to drive the escaping atmosphere into a 'cometary' tail and explain the high velocities observed in systems where mass-loss is occurring. In this paper, we present re…
Swift-XRT follow-up of gravitational wave triggers during the third aLIGO/Virgo observing run
Troja, E.; Cenko, S. B.; Sakamoto, T. +41 more
The Neil Gehrels Swift Observatory followed up 18 gravitational wave (GW) triggers from the LIGO/Virgo collaboration during the O3 observing run in 2019/2020, performing approximately 6500 pointings in total. Of these events, four were finally classified (if real) as binary black hole (BH) triggers, six as binary neutron star (NS) events, two each…
The high-redshift SFR-M* relation is sensitive to the employed star formation rate and stellar mass indicators: towards addressing the tension between observations and simulations
Stalevski, M.; Baes, M.; Gonzalez, V. +9 more
There is a severe tension between the observed star formation rate (SFR)-stellar mass (M⋆) relations reported by different authors at z = 1-4. In addition, the observations have not been successfully reproduced by state-of-the-art cosmological simulations that tend to predict a factor of 2-4 smaller SFRs at a fixed M⋆. We exa…