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282 papers · 1 filter
A modified Milne-Eddington approximation for a qualitative interpretation of chromospheric spectral lines
A. J. Dorantes-Monteagudo, A. L. Siu-Tapia, C. Quintero Noda +1
The Milne-Eddington approximation provides an analytic and simple solution to the radiative transfer equation. It can be easily implemented in inversion codes that are used to fit…
The Physical Properties of the SVS 13 Protobinary System: Two Circumstellar Disks and a Spiraling Circumbinary Disk in the Making
Ana K. Diaz-Rodriguez, Guillem Anglada, Guillermo Blázquez-Calero +13
We present VLA and ALMA observations of the close (0.3" = 90 au separation) protobinary system SVS 13. We detect two small circumstellar disks (radii 12 and 9 au in dus…
An episodically variable stellar wind in the planetary nebula IC\,4997
Luis F. Miranda, José M. Torrelles, Jorge Lillo-Box
IC\,4997 is a planetary nebula well known by its variability. We present high-resolution spectra of IC\,4997 obtained in 1993, 2019, and 2020 that reveal changes in the H and [N…
Dynamics of irregularly-shaped cometary particles subjected to outflowing gas and solar radiative forces and torques
Fernando Moreno, Daniel Guirado, Olga Muñoz +6
The dynamics of irregularly-shaped particles subjected to the combined effect of gas drag and radiative forces and torques in a cometary environment is investigated. The equations…
High-resolution detection of neutral oxygen and non-LTE effects in the atmosphere of KELT-9b
Francesco Borsa, Luca Fossati, Tommi Koskinen +2
Oxygen is a constituent of many of the most abundant molecules detected in exoplanetary atmospheres and a key ingredient for tracking how and where a planet formed. In particular,…
The Gaia-ESO Survey: Target selection of open cluster stars
A. Bragaglia, E. Alfaro, E. Flaccomio +36
The Gaia-ESO Survey (GES) is a public, high-resolution spectroscopic survey with FLAMES@VLT. GES targeted in particular a large sample of open clusters (OCs) of all ages. The diffe…