Search Publications
Three-component Kinematics of Multiple Stellar Populations in Globular Clusters with Gaia and VLT
Milone, A. P.; Cordoni, G.; Marino, A. F. +5 more
The internal dynamics of multiple stellar populations in globular clusters (GCs) provides unique constraints on the physical processes responsible for their formation. Specifically, the present-day kinematics of cluster stars, such as rotation and velocity dispersion, could be related to the initial configuration of the system. In recent work, we …
Phase II of the LAMOST-Kepler/K2 Survey. I. Time Series of Medium-resolution Spectroscopic Observations
Tian, Hao; Shi, Jianrong; Zhang, Yong +20 more
Phase II of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST)-Kepler/K2 survey (LK-MRS), initiated in 2018, aims at collecting medium-resolution spectra (R ∼ 7500; hereafter MRS) for more than 50,000 stars with multiple visits (∼60 epochs) over a period of 5 yr (2018 September to 2023 June). We selected 20 footprints distribut…
Two Directly Imaged, Wide-orbit Giant Planets around the Young, Solar Analog TYC 8998-760-1
Ginski, Christian; Kenworthy, Matthew A.; Mamajek, Eric E. +9 more
Even though tens of directly imaged companions have been discovered in the past decades, the number of directly confirmed multiplanet systems is still small. Dynamical analysis of these systems imposes important constraints on formation mechanisms of these wide-orbit companions. As part of the Young Suns Exoplanet Survey we report the detection of…
New Conductive Opacities for White Dwarf Envelopes
Blouin, Simon; Saumon, Didier; Shaffer, Nathaniel R. +1 more
Thanks to their continuous cooling and relative simplicity, white dwarf stars are routinely used to measure the ages of stellar populations. The usefulness of white dwarfs as cosmochronometers depends on the availability of accurate cooling models. A key ingredient of those models is conductive opacities, which largely govern the cooling rate. In …
WASP-127b: a misaligned planet with a partly cloudy atmosphere and tenuous sodium signature seen by ESPRESSO
Bouchy, F.; Rebolo, R.; Zapatero Osorio, M. R. +46 more
Context. The study of exoplanet atmospheres is essential for understanding the formation, evolution, and composition of exoplanets. The transmission spectroscopy technique is playing a significant role in this domain. In particular, the combination of state-of-the-art spectrographs at low- and high-spectral resolution is key to our understanding o…
A large catalogue of molecular clouds with accurate distances within 4 kpc of the Galactic disc
Wang, H. -F.; Huang, Y.; Chen, B. -Q. +6 more
We present a large, homogeneous catalogue of molecular clouds within 4 kpc from the Sun at low Galactic latitudes (|b| < 10°) with unprecedented accurate distance determinations. Based on the 3D dust reddening map and estimates of colour excesses and distances of over 32 million stars presented in Chen et al., we have identified 567 dust/molecu…
Global Model of Whistler Mode Chorus in the Near-Equatorial Region (|λm|< 18°)
Shen, Xiao-Chen; Meredith, Nigel P.; Horne, Richard B. +2 more
We extend our database of whistler mode chorus, based on data from seven satellites, by including ∼3 years of data from Radiation Belt Storm Probes (RBSP)-A and RBSP-B and an additional ∼6 years of data from Time History of Events and Macroscale Interactions during Substorms (THEMIS)-A, THEMIS-D, and THEMIS-E. The new database allows us to probe t…
Seismic evidence for near solid-body rotation in two Kepler subgiants and implications for angular momentum transport
Eggenberger, P.; Spada, F.; Deheuvels, S. +3 more
Context. Asteroseismic measurements of the internal rotation of subgiants and red giants all show the need for invoking a more efficient transport of angular momentum than theoretically predicted. Constraints on the core rotation rate are available starting from the base of the red giant branch (RGB) and we are still lacking information on the int…
In pursuit of giants. I. The evolution of the dust-to-stellar mass ratio in distant dusty galaxies
Gómez-Guijarro, C.; Małek, K.; Feltre, A. +11 more
The dust-to-stellar mass ratio (Mdust/M⋆) is a crucial, albeit poorly constrained, parameter for improving our understanding of the complex physical processes involved in the production of dust, metals, and stars in galaxy evolution. In this work, we explore trends of Mdust/M⋆ with different physical par…
MUSE Analysis of Gas around Galaxies (MAGG) - I: Survey design and the environment of a near pristine gas cloud at z ≈ 3.5
Prochaska, J. Xavier; Lusso, Elisabeta; Murphy, Michael T. +9 more
We present the design, methods, and first results of the MUSE Analysis of Gas around Galaxies (MAGG) survey, a large programme on the Multi-Unit Spectroscopic Explorer (MUSE) instrument at the Very Large Telescope (VLT), which targets 28 z > 3.2 quasars to investigate the connection between optically thick gas and galaxies at z ∼ 3-4. MAGG maps…