Radial velocity precision of ESPRESSO through the analysis of the solar twin HIP 11915

Abstract

Different stellar phenomena affect radial velocities (RVs), causing variations large enough to make it difficult to identify planet signals from the stellar variability. RV variations caused by stellar oscillations and granulation can be reduced through some methods, but the impact of rotationally modulated magnetic activity on RV, due to stellar active regions is harder to correct. New instrumentation promises an improvement in precision of one order of magnitude, from about 1 m/s, to about 10 cm/s. In this context, we report our first results from 24 spectroscopic ESPRESSO/VLT observations of the solar twin star HIP 11915, spread over 60 nights. We used a Gaussian Process approach and found for HIP 11915 a RV residual RMS scatter of about 20 cm s${}^{-1}$, representing an upper limit for the performance of ESPRESSO.

Accepted to the AJ (Aug 2021)

References in corpus (15)

• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• ESPRESSO@VLT -- On-sky performance and first results
• Planets and Stellar Activity: Hide and Seek in the CoRoT-7 system
• SOAP 2.0: A tool to estimate the photometric and radial velocity variations induced by stellar spots and plages
• Inferring probabilistic stellar rotation periods using Gaussian processes
• Search for exoplanets with the radial-velocity technique: quantitative diagnostics of stellar activity
• Radial-Velocity Fitting Challenge. II. First results of the analysis of the data set
• The temporal evolution of neutron-capture elements in the Galactic discs
• Filtering solar-like oscillations for exoplanet detection in radial velocity observations
• The CARMENES search for exoplanets around M dwarfs. Radial velocities and activity indicators from cross-correlation functions with weighted binary masks
• Constraining the evolution of stellar rotation using solar twins
• Temporal evolution and correlations of optical activity indicators measured in Sun-as-a-star observations
• Detection Limits of Low-mass, Long-period Exoplanets Using Gaussian Processes Applied to HARPS-N Solar RVs
• Stellar activity as noise in exoplanet detection I. Methods and application to solar-like stars and activity cycles
• Explosive nucleosynthesis of a metal-deficient star as the source of a distinct odd-even effect in the solar twin HIP 11915

Cited by in corpus (2)

• A framework for the architecture of exoplanetary systems. I. Four classes of planetary system architecture
• The Potential of Detecting Nearby Terrestrial Planets in the HZ with Different Methods