Search Publications
A Dynamical Measurement of the Disk Mass in Elias 227
Testi, Leonardo; Lodato, Giuseppe; Pérez, Laura M. +4 more
Recent multi-wavelength Atacama Large Millimeter/submillimeter Array (ALMA) observations of the protoplanetary disk orbiting around Elias 227 revealed a two-armed spiral structure. The observed morphology, together with the young age of the star and the disk-to-star mass ratio estimated from dust-continuum emission, make this system a perfect labo…
The Hubble PanCET Program: Transit and Eclipse Spectroscopy of the Strongly Irradiated Giant Exoplanet WASP-76b
Deming, Drake; Nikolov, Nikolay; Sing, David K. +22 more
Ultra-hot Jupiters with equilibrium temperatures greater than 2000 K are uniquely interesting targets as they provide us crucial insights into how atmospheres behave under extreme conditions. This class of giant planets receives intense radiation from their host star and usually has strongly irradiated and highly inflated atmospheres. At such a hi…
On the multiwavelength variability of Mrk 110: two components acting at different time-scales
McHardy, I.; Breedt, E.; Peterson, B. M. +17 more
We present the first intensive continuum reverberation mapping study of the high accretion-rate Seyfert galaxy Mrk 110. The source was monitored almost daily for more than 200 d with the Swift X-ray and ultraviolet (UV)/optical telescopes, supported by ground-based observations from Las Cumbres Observatory, the Liverpool Telescope, and the Zowada …
A tale of two mergers: constraints on kilonova detection in two short GRBs at z ∼ 0.5
Troja, E.; Wollaeger, R. T.; Cenko, S. B. +15 more
We present a detailed multiwavelength analysis of two short gamma-ray bursts (sGRBs) detected by the Neil Gehrels Swift Observatory: GRB 160624A at $z$ = 0.483 and GRB 200522A at $z$ = 0.554. These sGRBs demonstrate very different properties in their observed emission and environment. GRB 160624A is associated with a late-type galaxy with an old s…
A catalogue of 74 new open clusters found in Gaia Data-Release 2
Xu, Ye; Li, Jing-Jing; Wu, Zhen-Yu +2 more
Based on astrometric data from Gaia Data-Release 2 (DR2), we employ an unsupervised machine learning method to blindly search for open star clusters in the Milky Way within the Galactic latitude range of |b| < 20°. In addition to 2080 known clusters, 74 new open cluster candidates are found. In this work, we present the positions, apparent radi…
Abundance-age relations with red clump stars in open clusters
Jordi, C.; Casamiquela, L.; Balaguer-Núñez, L. +8 more
Context. Precise chemical abundances coupled with reliable ages are key ingredients to understanding the chemical history of our Galaxy. Open clusters (OCs) are useful for this purpose because they provide ages with good precision.
Aims: The aim of this work is to investigate the relation between different chemical abundance ratios and age tr…
A hot subdwarf-white dwarf super-Chandrasekhar candidate supernova Ia progenitor
Geier, S.; Heber, U.; Irrgang, A. +8 more
Supernovae Ia are bright explosive events that can be used to estimate cosmological distances, allowing us to study the expansion of the Universe. They are understood to result from a thermonuclear detonation in a white dwarf that formed from the exhausted core of a star more massive than the Sun. However, the possible progenitor channels leading …
Quenching of star formation from a lack of inflowing gas to galaxies
Richard, Johan; van Dokkum, Pieter G.; Mowla, Lamiya +16 more
Star formation in half of massive galaxies was quenched by the time the Universe was 3 billion years old1. Very low amounts of molecular gas seem to be responsible for this, at least in some cases2-7, although morphological gas stabilization, shock heating or activity associated with accretion onto a central supermassive blac…
The Gaia-ESO Survey: Galactic evolution of lithium from iDR6
Montes, D.; de Laverny, P.; Guiglion, G. +31 more
Context. After more than 50 years, astronomical research still struggles to reconstruct the history of lithium enrichment in the Galaxy and to establish the relative importance of the various 7Li sources in enriching the interstellar medium (ISM) with this fragile element.
Aims: To better trace the evolution of lithium in the Milky…
Understanding the Origins of Problem Geomagnetic Storms Associated with "Stealth" Coronal Mass Ejections
Rouillard, Alexis P.; Pagano, Paolo; Nitta, Nariaki V. +14 more
Geomagnetic storms are an important aspect of space weather and can result in significant impacts on space- and ground-based assets. The majority of strong storms are associated with the passage of interplanetary coronal mass ejections (ICMEs) in the near-Earth environment. In many cases, these ICMEs can be traced back unambiguously to a specific …