# A warm Jupiter-sized planet transiting the pre-main sequence star V1298 Tau

## TL;DR

This paper reports the discovery of V1298 Tau b, a warm Jupiter-sized transiting planet around a young star, offering a unique opportunity to study early planetary evolution and atmospheric properties.

## Contribution

First detection of a transiting warm Jupiter around a pre-main sequence star, enabling future atmospheric characterization and insights into planet formation.

## Key findings

- Planet has a radius of 0.91 R_Jup and a 24.1-day orbit.
- Host star is young, approximately 23 million years old.
- Transit depth is 0.5%, with a bright, rapidly rotating host star.

## Abstract

We report the detection of V1298 Tau b, a warm Jupiter-sized planet ($R_P$ = 0.91 $\pm$ 0.05~ $R_\mathrm{Jup}$, $P = 24.1$ days) transiting a young solar analog with an estimated age of 23 million years. The star and its planet belong to Group 29, a young association in the foreground of the Taurus-Auriga star-forming region. While hot Jupiters have been previously reported around young stars, those planets are non-transiting and near-term atmospheric characterization is not feasible. The V1298 Tau system is a compelling target for follow-up study through transmission spectroscopy and Doppler tomography owing to the transit depth (0.5\%), host star brightness ($K_s$ = 8.1 mag), and rapid stellar rotation ($v\sin{i}$ = 23 \kms). Although the planet is Jupiter-sized, its mass is presently unknown due to high-amplitude radial velocity jitter. Nevertheless, V1298 Tau b may help constrain formation scenarios for at least one class of close-in exoplanets, providing a window into the nascent evolution of planetary interiors and atmospheres.