Search Publications
The rocky road to quiescence: compaction and quenching of quasar host galaxies at z ∼ 2
Ivison, R. J.; Vegetti, S.; McKean, J. P. +6 more
We resolve the host galaxies of seven gravitationally lensed quasars at redshift 1.5-2.8 using observations with the Atacama Large (sub)Millimetre Array. Using a visibility plane lens modelling technique, we create pixellated reconstructions of the dust morphology, and CO line morphology and kinematics. We find that the quasar hosts in our sample …
The proper motion of Andromeda from Gaia EDR3: confirming a nearly radial orbit
Reylé, C.; Famaey, B.; Ibata, R. +4 more
We present an analysis of the proper motion of the Andromeda galaxy (M31), based on the Early Third Data Release of the Gaia mission. We use the Gaia photometry to select young blue main-sequence stars and apply several quality cuts to obtain clean samples of these tracers. After correcting the proper motion measurements for the internal rotation …
Limits on Millimeter Continuum Emission from Circumplanetary Material in the DSHARP Disks
Wilner, David J.; Andrews, Sean M.; Huang, Jane +10 more
We present a detailed analysis for a subset of the high-resolution (~35 mas, or 5 au) ALMA observations from the Disk Substructures at High Angular Resolution Project (DSHARP) to search for faint 1.3 mm continuum emission associated with dusty circumplanetary material located within the narrow annuli of depleted emission (gaps) in circumstellar di…
Orbital misalignment of the super-Earth π Men c with the spin of its star
Kunovac Hodžić, Vedad; Triaud, Amaury H. M. J.; Cegla, Heather M. +2 more
Planet-planet scattering events can leave an observable trace of a planet's migration history in the form of orbital misalignment with respect to the stellar spin axis, which is measurable from spectroscopic time-series taken during transit. We present high-resolution spectroscopic transits observed with ESPRESSO of the close-in super-Earth π Men …
The Pristine survey - XII. Gemini-GRACES chemo-dynamical study of newly discovered extremely metal-poor stars in the Galaxy
Sestito, Federico; Navarro, Julio F.; Martin, Nicolas F. +16 more
High-resolution optical spectra of 30 metal-poor stars selected from the Pristine survey are presented, based on observations taken with the Gemini Observatory GRACES spectrograph. Stellar parameters Teff and log g are determined using a Gaia DR2 colour-temperature calibration and surface gravity from the Stefan-Boltzmann equation. GRAC…
Discovery of a directly imaged planet to the young solar analog YSES 2
Mugrauer, Markus; Ginski, Christian; Kenworthy, Matthew A. +8 more
Context. To understand the origin and formation pathway of wide-orbit gas giant planets, it is necessary to expand the limited sample of these objects. The mass of exoplanets derived with spectrophotometry, however, varies strongly as a function of the age of the system and the mass of the primary star.
Aims: By selecting stars with similar a…
The X-CLASS survey: A catalogue of 1646 X-ray-selected galaxy clusters up to z ∼ 1.5
Altieri, B.; Valtchanov, I.; Pierre, M. +25 more
Context. Cosmological probes based on galaxy clusters rely on cluster number counts and large-scale structure information. X-ray cluster surveys are well suited for this purpose because they are far less affected by projection effects than optical surveys, and cluster properties can be predicted with good accuracy.
Aims: The XMM Cluster Archi…
Don't cross the streams: caustics from fuzzy dark matter
Bovy, Jo; Dalal, Neal; Hui, Lam +1 more
We study how tidal streams from globular clusters may be used to constrain the mass of ultra-light dark matter particles, called `fuzzy' dark matter (FDM). A general feature of FDM models is the presence of ubiquitous density fluctuations in bound, virialized dark matter structures, on the scale of the de Broglie wavelength, arising from wave inte…
Stellar flares detected with the Next Generation Transit Survey
Jackman, James A. G.; Wheatley, Peter J.; Bayliss, Daniel +19 more
We present the results of a search for stellar flares in the first data release from the Next Generation Transit Survey (NGTS). We have found 610 flares from 339 stars, with spectral types between F8 and M6, the majority of which belong to the Galactic thin disc. We have used the 13-s cadence NGTS light curves to measure flare properties such as t…
Infrared emission of z ∼ 6 galaxies: AGN imprints
Ferrara, A.; Vito, F.; Pallottini, A. +6 more
We investigate the infrared (IR) emission of high-redshift (z ∼ 6), highly star-forming ( ${{\rm SFR}\gt 100\,{\rm M}_{\odot }\, {\rm yr}^{-1}}$ ) galaxies, with/without active galactic nuclei (AGN), using a suite of cosmological simulations featuring dust radiative transfer. Synthetic spectral energy distributions (SEDs) are used to quantify the …