Context. The chemical composition of the Sun is required in the context of various studies in astrophysics, among them in the calculation of standard solar models (SSMs) used to describe the evolution of the Sun from the pre-main-sequence to its present age. Aims. In this work, we provide a critical re-analysis of the solar chemical abundances and ...
Context: Red supergiant (RSGs) are cool massive stars in a late phase of their evolution when the stellar envelope becomes fully convective. They are the brightest stars in the universe at infrared light and can be detected in galaxies far beyond the Local Group, allowing for accurate determination of chemical composition of galaxies. The study of ...
Published in Frontiers in Astronomy and Space Sciences
Sodium and potassium signatures in transiting exoplanets can be challenging to isolate from the stellar absorption lines. Here, these challenges are discussed in the framework of Solar System observations, and transits of Mercury in particular. Radiation pressure is important for alkali gas dynamics in close-orbiting exoplanets since the D lines ar...
status: published
Missing Stark widths for 37 spectral lines of strontium ions (17 Sr V lines and 20 Sr VI lines) have been calculated using a quantum mechanical method. 23 spectral lines of Sr V have been recently discovered, for the first time, in the Ultraviolet (UV) spectrum of the hot white dwarf RE 0503−289. This recent discovery prompts us to calculate the St...
status: published
In the target-rich era of exoplanetary science, time on large-aperture telescopes will be at a premium, and more transmission spectroscopy studies will be conducted using distributed heterogeneous networks of small (
The TRAPPIST-1 planetary system is favourable for transmission spectroscopy and offers the unique opportunity to study rocky planets with possibly non-primary envelopes. We present here the transmission spectrum of the seventh planet of the TRAPPIST-1 system, TRAPPIST-1 h (R$_{\rm P}$=0.752 R$_{\oplus}$, T$_{\rm eq}$=173K) using Hubble Space Telesc...
Context. VX Sgr is a cool, evolved, and luminous red star whose stellar parameters are difficult to determine, which affects its classification. Aims. We aim to spatially resolve the photospheric extent as well as the circumstellar environment. Methods. We used interferometric observations obtained with the MATISSE instrument in the L (3 to 4 {\mu}...
status: published
