TESS Investigation -- Demographics of Young Exoplanets (TI-DYE) III: an inner super-Earth in TOI-2076

TL;DR

This paper reports the discovery of an inner super-Earth in the young planetary system TOI-2076, providing insights into planet evolution and demonstrating the value of updated TESS data and analysis methods.

Contribution

It introduces the detection of a new inner super-Earth in TOI-2076 and refines the system's age using multiple stellar indicators.

Findings

TOI-2076 hosts a new 1.35 R⊕ planet with a 3.02-day orbit.

The system's age is estimated at 210 ± 20 Myr.

Updated data and methods enhance planet detection capabilities.

Abstract

Young (<500 Myr) multi-planet transiting systems are valuable environments for understanding planet evolution by offering an opportunity to make direct comparisons between planets from the same formation conditions. TOI-2076 is known to harbor three, 2.5-4 $R_\oplus$ planets on 10-35 day orbits. All three are JWST cycle 3 targets (for transmission spectroscopy). Here, we present the detection of TOI-2076 e; a smaller (1.35 $R_\oplus$), inner (3.02 day) planet in the system. We update the age of the system by analyzing the rotation periods, Lithium equivalent widths, color-magnitude diagram, and variability of likely co-moving stars, finding that TOI-2076 and co-moving planetary system TOI-1807 are 210 $\pm$ 20 Myr. The discovery of TOI-2076 e is motivation to revisit known transiting systems in search of additional planets that are now detectable with new TESS data and updated search methods.