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Apr 12, 2011

Sulphur abundances in halo giants from the [S I] line at 1082 nm and …

It is still debated whether or not the Galactic chemical evolution of sulphur in the halo followed the constant or flat trend with [Fe/H], ascribed t…
Nov 22, 2016

Concentrating small particles in protoplanetary disks through the s…

Laboratory experiments indicate that direct growth of silicate grains via mutual collisions can only produce particles up to roughly millimeters in s…
Apr 27, 2016

The EMBLA Survey -- Metal-poor stars in the Galactic bulge

Cosmological models predict the oldest stars in the Galaxy should be found closest to the centre of the potential well, in the bulge. The EMBLA Surve…
Aug 04, 2017

Spatially resolved spectroscopy across stellar surfaces. I. Using e…

CONTEXT: High-precision stellar analyses require hydrodynamic modeling to interpret chemical abundances or oscillation modes. Exoplanet atmosphere st…
Jan 13, 2018

Star Clusters in Evolving Galaxies

Their ubiquity and extreme densities make star clusters probes of prime importance of galaxy evolution. Old globular clusters keep imprints of the ph…
Jul 23, 2014

On the Feeding Zone of Planetesimal Formation by the Streaming Inst…

The streaming instability is a promising mechanism to overcome the barriers in direct dust growth and lead to the formation of planetesimals. Most pr…
Aug 04, 2017

Spatially resolved spectroscopy across stellar surfaces. II. High-r…

CONTEXT: High-resolution spectroscopy across spatially resolved stellar surfaces aims at obtaining spectral-line profiles that are free from rotation…
Feb 14, 2009

A Chandra Study of the Galactic Globular Cluster Omega Centauri

We analyze a ~70 ksec Chandra ACIS-I exposure of the globular cluster Omega Centauri (NGC 5139). The ~17 amin x 17 amin field of view fully encompass…
Sep 29, 2010

Chemical evolution of the Galactic bulge as traced by microlensed dwa…

Context: In order to study the evolution of Li in the Galaxy it is necessary to observe dwarf or subgiant stars. Abridged Although Li has been extens…
Jun 12, 2017

Radially resolved simulations of collapsing pebble clouds in protop…

We study the collapse of pebble clouds with a statistical model to find the internal structure of comet-sized planetesimals. Pebble-pebble collisions…
Jun 29, 2015

Galactic Archeology - requirements on survey spectrographs

Galactic Archeology is about exploring the Milky Way as a galaxy by, mainly, using its (old) stars as tracers of past events and thus figure out the …
Jun 02, 2016

A new algorithm for optimizing the wavelength coverage for spectrosco…

The past decade and a half has seen the design and execution of several ground-based spectroscopic surveys, both Galactic and Extra-galactic. Additio…
Aug 29, 2017

The dynamical evolution of transiting planetary systems including a …

Planet-planet collisions are a common outcome of instability in systems of transiting planets close to the star, as well as occurring during in-situ …
Jun 24, 2019

The Gaia reference frame for bright sources examined using VLBI obs…

Positions and proper motions of Gaia sources are expressed in a reference frame that ideally should be non-rotating relative to distant extragalactic…
May 14, 2012

Rapid growth of gas-giant cores by pebble accretion

The observed lifetimes of gaseous protoplanetary discs place strong constraints on gas and ice giant formation in the core accretion scenario. The ap…
Jul 04, 2012
Optics

Stellar Intensity Interferometry: Prospects for sub-milliarcsecond …

Using kilometric arrays of air Cherenkov telescopes, intensity interferometry may increase the spatial resolution in optical astronomy by an order of…
Jan 22, 2017

Determination of robust metallicities for metal-rich red giant branch…

The study of the Milky Way relies on our ability to interpret the light from stars correctly. This calls for a reinvestigation of how reliably we can…
Oct 30, 2012

Unveiling systematic biases in 1D LTE excitation-ionisation balance o…

We present a comprehensive analysis of different techniques available for the spectroscopic analysis of FGK stars, and provide a recommended methodol…
Apr 23, 2018

Estimating stellar ages and metallicities from parallaxes and broadba…

A deep understanding of the Milky Way galaxy, its formation and evolution requires observations of large numbers of stars. Stellar photometry provide…
Aug 05, 2014

Stellar irradiated discs and implications on migration of embedded …

The migration strength and direction of embedded low-mass planets depends on the disc structure. In discs with an efficient radiative transport, the …
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