The NEID Earth Twin Survey. III. Survey Performance After Three Years on Sky

TL;DR

The NEID Earth Twin Survey has collected three years of high-precision radial velocity data on 41 stars, demonstrating sensitivity to known planets and revealing new signals, with ongoing calibration and data analysis efforts.

Contribution

This paper reports the three-year survey performance, calibration updates, and detection capabilities of NEID for nearby stars, including new RV signals discovery.

Findings

Sensitivity to planets with periods shorter than the survey baseline

Detection of new RV signals in the data

Calibration of zero point offsets after fire incident

Abstract

The NEID Earth Twin Survey (NETS) has been delivering a rich set of precise radial velocity (RV) measurements for 41 bright, nearby main sequence stars. Here, we describe the status of the survey after three years on sky and we present the full set of RV measurements and accompanying stellar activity indicators. We discuss intermediate survey diagnostics, including calibration of the known RV zero point offset introduced following the Contreras fire in 2022 and the identification of an undiagnosed and previously unknown zero point offset in 2021. An analysis of our data set using RVSearch demonstrates that for these target stars, NEID is independently sensitive to nearly all known planets with periods shorter than the NETS observing baseline. We also highlight a number of newly detected RV signals, which present exciting opportunities for future investigations.