Abstract Study Analysis Group 21 (SAG21) of NASA's Exoplanet Exploration Program
Analysis Group was organized to study the effect of stellar contamination on space-based …

Measured spectral shifts due to intrinsic stellar variability (eg, pulsations, granulation) and
activity (eg, spots, plages) are the largest source of error for extreme-precision radial-velocity …

We present an analysis of Sun-as-a-star observations from four different high-resolution,
stabilized spectrographs—HARPS, HARPS-N, EXPRES, and NEID. With simultaneous …

Developments in the stability of modern spectrographs have led to extremely precise
instrumental radial velocity (RV) measurements. For most stars, the detection limit of …

Context. Stellar flares of active M dwarfs can affect the atmospheric composition of close-
orbiting gas giants, and can result in time-dependent transmission spectra. Aims. We aim to …

With its near-to-mid-infrared high-contrast imaging capabilities, JWST is ushering us into a
golden age of directly imaging Jupiter-like planets. As the two closest cold Jupiters, ε Ind A b …

The detection of stellar variability often relies on the measurement of selected activity
indicators, such as coronal emission lines and nonthermal emissions. On the flip side, the …

Thousands of exoplanet detections have been made over the last 25 years using Doppler
observations, transit photometry, direct imaging, and astrometry. Each of these methods is …

The distribution of small-scale magnetic fields in stellar photospheres is an important
ingredient in our understanding of the magnetism of low-mass stars. Their spatial distribution …

This study aims to identify potential exoplanet signals from nearby stars with resolved debris
discs. However, the high activity of many stars with debris discs limits the detection of …