Search Publications
The Orbital Histories of Magellanic Satellites Using Gaia DR2 Proper Motions
van der Marel, Roeland P.; Gómez, Facundo A.; Weisz, Daniel R. +6 more
With the release of Gaia DR2, it is now possible to measure the proper motions (PMs) of the lowest-mass, ultrafaint satellite galaxies in the Milky Way's (MW) halo for the first time. Many of these faint satellites are posited to have been accreted as satellites of the Magellanic Clouds (MCs). Using their six-dimensional phase-space information, w…
Measuring Turbulent Motion in Planet-forming Disks with ALMA: A Detection around DM Tau and Nondetections around MWC 480 and V4046 Sgr
Hughes, A. Meredith; Wilner, David J.; Kóspál, Ágnes +6 more
Turbulence is a crucial factor in many models of planet formation, but it has only been directly constrained among a small number of planet-forming disks. Building on the upper limits on turbulence placed in disks around HD 163296 and TW Hya, we present ALMA CO J = 2-1 line observations at ∼0"3 (20-50 au) resolution and 80 ms-1 channel …
CARMENES input catalogue of M dwarfs. V. Luminosities, colours, and spectral energy distributions
Amado, P. J.; Caballero, J. A.; Reiners, A. +15 more
Context. The relevance of M dwarfs in the search for potentially habitable Earth-sized planets has grown significantly in the last years.
Aims: In our on-going effort to comprehensively and accurately characterise confirmed and potential planet-hosting M dwarfs, in particular for the CARMENES survey, we have carried out a comprehensive multi-…
Tracing the total molecular gas in galaxies: [CII] and the CO-dark gas
Ramambason, L.; Lebouteiller, V.; Madden, S. C. +11 more
Context. Molecular gas is a necessary fuel for star formation. The CO (1-0) transition is often used to deduce the total molecular hydrogen but is challenging to detect in low-metallicity galaxies in spite of the star formation taking place. In contrast, the [C II]λ158 µm is relatively bright, highlighting a potentially important reservoir o…
Probing cosmic isotropy with a new X-ray galaxy cluster sample through the LX-T scaling relation
Lovisari, L.; Pacaud, F.; Ramos-Ceja, M. E. +3 more
The isotropy of the late Universe and consequently of the X-ray galaxy cluster scaling relations is an assumption greatly used in astronomy. However, within the last decade, many studies have reported deviations from isotropy when using various cosmological probes; a definitive conclusion has yet to be made. New, effective and independent methods …
A new mass-loss rate prescription for red supergiants
Smith, Nathan; Gehrz, Robert D.; van Loon, Jacco Th +3 more
Evolutionary models have shown the substantial effect that strong mass-loss rates ( $\dot{M}$ s) can have on the fate of massive stars. Red supergiant (RSG) mass-loss is poorly understood theoretically, and so stellar models rely on purely empirical $\dot{M}$ -luminosity relations to calculate evolution. Empirical prescriptions usually scale with …
Observations of edge-on protoplanetary disks with ALMA. I. Results from continuum data
Pinte, C.; Ménard, F.; Duchêne, G. +15 more
Aims: We aim to study vertical settling and radial drift of dust in protoplanetary disks from a different perspective: an edge-on view. An estimation of the amplitude of settling and drift is highly relevant to understanding planet formation.
Methods: We analyze a sample of 12 HST-selected edge-on protoplanetary disks (i.e., seen with hi…
Updated constraints on asteroid-mass primordial black holes as dark matter
Profumo, Stefano; Guhathakurta, Puragra; McKinnon, Kevin +3 more
Microlensing of stars places significant constraints on subplanetary-mass compact objects, including primordial black holes, as dark matter candidates. As the lens' Einstein radius in the source plane becomes comparable to the size of the light source, however, source amplification is strongly suppressed, making it challenging to constrain lenses …
Quasars as standard candles. III. Validation of a new sample for cosmological studies
Marconi, A.; Vignali, C.; Gilli, R. +15 more
We present a new catalogue of ∼2400 optically selected quasars with spectroscopic redshifts and X-ray observations from either Chandra or XMM-Newton. The sample can be used to investigate the non-linear relation between the ultraviolet (UV) and X-ray luminosity of quasars as well as to build a Hubble diagram up to a redshift of z ∼ 7.5. We selecte…
Dust-depleted Inner Disks in a Large Sample of Transition Disks through Long-baseline ALMA Observations
van der Marel, Nienke; Francis, Logan
Transition disks with large inner dust cavities are thought to host massive companions. However, the disk structure inside the companion orbit and how material flows toward an actively accreting star remain unclear. We present a high-resolution continuum study of inner disks in the cavities of 38 transition disks. Measurements of the dust mass fro…