# Search for nearby Earth analogs I. 15 planet candidates found in PFS data

## TL;DR

This study applies a robust signal detection framework to high-precision radial velocity data, successfully identifying 15 nearby exoplanet candidates, including potential Earth analogs, demonstrating the effectiveness of automated detection methods.

## Contribution

The paper introduces an automated, statistically rigorous approach for detecting exoplanets in radial velocity data, enabling efficient identification of nearby Earth-like planets.

## Key findings

- 15 planet candidates identified in 14 stellar systems
- Some candidates are in temperate zones suitable for liquid water
- Discovery of a 1:2 resonance system around HIP 54373

## Abstract

The radial velocity method plays a major role in the discovery of nearby exoplanets. To efficiently find planet candidates from the data obtained in high precision radial velocity surveys, we apply a signal diagnostic framework to detect radial velocity signals that are statistically significant, consistent in time, robust to the choice of noise models, and not correlated with stellar activity. Based on the application of this approach to the survey data of the Planet Finder Spectrograph (PFS), we report fifteen planet candidates located in fourteen stellar systems. We find that the orbits of the planet candidates around HD 210193, 103949, 8326, and 71135 are consistent with temperate zones around these stars (where liquid water could exist on the surface). With periods of 7.76 and 15.14 days respectively, the planet candidates around star HIP 54373 form a 1:2 resonance system. These discoveries demonstate the feasibility of automated detection of exoplanets from large radial velocity surveys, which may provide a complete sample of nearby Earth analogs.