Search Publications
A tentative detection of He I in the atmosphere of GJ 1214 b
Sánchez-López, A.; López-Puertas, M.; Nagel, E. +27 more
The He I λ10833 Å triplet is a powerful tool for characterising the upper atmosphere of exoplanets and tracing possible mass loss. Here, we analysed one transit of GJ 1214 b observed with the CARMENES high-resolution spectrograph to study its atmosphere via transmission spectroscopy around the He I triplet. Although previous studies using lower re…
A 20 Second Cadence View of Solar-type Stars and Their Planets with TESS: Asteroseismology of Solar Analogs and a Recharacterization of π Men c
Barclay, Thomas; Chaplin, William J.; Hermes, J. J. +50 more
We present an analysis of the first 20 second cadence light curves obtained by the TESS space telescope during its extended mission. We find improved precision of 20 second data compared to 2 minute data for bright stars when binned to the same cadence (≈10%-25% better for T ≲ 8 mag, reaching equal precision at T ≈ 13 mag), consistent with pre-fli…
Characterizing epochs of star formation across the Milky Way disc using age-metallicity distributions of GALAH stars
Feuillet, Diane K.; Feltzing, Sofia; Sahlholdt, Christian L.
We provide a detailed map of the ages and metallicities of turn-off stars in the Milky Way disc based on data from GALAH DR3 and Gaia EDR3. From this map, we identify previously undetected features in the age-metallicity distribution of disc stars and interpret these results as indicating a three-phase formation history of the Milky Way. In the fi…
Irradiation-driven escape of primordial planetary atmospheres. II. Evaporation efficiency of sub-Neptunes through hot Jupiters
Haardt, Francesco; Rauscher, Emily; Malsky, Isaac +3 more
Making use of the publicly available 1D photoionization hydrodynamics code ATES we set out to investigate the combined effects of specific planetary gravitational potential energy (ϕp ≡ GMp/Rp) and stellar X-ray and extreme ultraviolet (XUV) irradiation (FXUV) on the evaporation efficiency (η) of moderat…
Multiple phase spirals suggest multiple origins in Gaia DR3
Price-Whelan, Adrian M.; Johnston, Kathryn V.; Darragh-Ford, Elise +1 more
Gaia Data Release 2 revealed that the Milky Way contains significant indications of departures from equilibrium in the form of asymmetric features in the phase space density of stars in the Solar neighbourhood. One such feature is the z-vz phase spiral, interpreted as the response of the disc to the influence of a perturbation perpendic…
CLEAR: The Ionization and Chemical-enrichment Properties of Galaxies at 1.1 < z < 2.3
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +15 more
We use deep spectroscopy from the Hubble Space Telescope Wide-Field-Camera 3 IR grisms combined with broadband photometry to study the stellar populations, gas ionization and chemical abundances in star-forming galaxies at z ~ 1.1-2.3. The data stem from the CANDELS Lyα Emission At Reionization (CLEAR) survey. At these redshifts, the grism spectro…
Photometry and astrometry with JWST - I. NIRCam point spread functions and the first JWST colour-magnitude diagrams of a globular cluster
Salaris, M.; Bedin, L. R.; Nardiello, D. +4 more
As the James Webb Space Telescope (JWST) has become fully operational, early release data are now available to begin building the tools and calibrations for precision point-source photometry and astrometry in crowded cluster environments. Here, we present our independent reduction of NIRCam imaging of the metal-poor globular cluster M 92, which we…
Nested dust shells around the Wolf-Rayet binary WR 140 observed with JWST
Hamaguchi, Kenji; Corcoran, Michael F.; Morris, Mark R. +29 more
Massive colliding-wind binaries that host a Wolf-Rayet (WR) star present a potentially important source of dust and chemical enrichment in the interstellar medium. However, the chemical composition and survival of dust formed from such systems is not well understood. The carbon-rich Wolf-Rayet binary WR 140 presents an ideal astrophysical laborato…
Accretion mode versus radio morphology in the LOFAR Deep Fields
Bondi, M.; Prandoni, I.; Shimwell, T. W. +17 more
Radio-loud active galaxies have two accretion modes [radiatively inefficient (RI) and radiatively efficient (RE)], with distinct optical and infrared signatures, and two jet dynamical behaviours, which in arcsec- to arcmin-resolution radio surveys manifest primarily as centre- or edge-brightened structures [Fanaroff-Riley (FR) class I and II]. The…
Constraints on dark matter self-interaction from the internal density profiles of X-COP galaxy clusters
Pointecouteau, E.; Eckert, D.; Ettori, S. +4 more
The fundamental properties of the postulated dark matter (DM) affect the internal structure of gravitationally bound structures. In the cold dark matter paradigm, DM particles interact only via gravity. Their distribution is well represented by an Einasto profile with shape parameter α ≈ 0.18 in the smallest dwarf galaxies or the most massive gala…