# LHS 475 b: A Venus-sized Planet Orbiting a Nearby M Dwarf

**Authors:** Kristo Ment, David Charbonneau, Jonathan Irwin, Jennifer G. Winters, Emily Pass, Avi Shporer, Zahra Essack, Veselin B. Kostov, Michelle Kunimoto, Alan Levine, Sara Seager, Roland Vanderspek, Joshua N. Winn  
**arXiv:** [2304.01920](https://arxiv.org/abs/2304.01920)  
**Date:** 2023-04-04  
**Summary page:** https://www.summarizepaper.com/fr/paper/2304.01920v1/

## Abstract

Based on photometric observations by TESS, we present the discovery of a Venus-sized planet transiting LHS 475, an M3 dwarf located 12.5 pc from the Sun. The mass of the star is $0.274 \pm 0.015~\rm{M_{Sun}}$. The planet, originally reported as TOI 910.01, has an orbital period of $2.0291025 \pm 0.0000020$ days and an estimated radius of $0.955 \pm 0.053~\rm{R_{Earth}}$. We confirm the validity and source of the transit signal with MEarth ground-based follow-up photometry of five individual transits. We present radial velocity data from CHIRON that rule out massive companions. In accordance with the observed mass-radius distribution of exoplanets as well as planet formation theory, we expect this Venus-sized companion to be terrestrial, with an estimated RV semi-amplitude close to 1.0 m/s. LHS 475 b is likely too hot to be habitable but is a suitable candidate for emission and transmission spectroscopy.