TESS Investigation -Demographics of Young Exoplanets (TI-DYE) III: An Inner Super-Earth In TOI-2076

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_⊕ 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_⊕), 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 ± 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.

Young, multi-planet transiting systems found in a stellar cluster or association (left) compared to mature multiplanet systems from Kepler around similar host stars (right). The mature ≥3-planet systems show a higher level of intra-system uniformity in period and radius space than the young systems. The inclusion of TOI-2076 e pushes the system out of uniformity. — astro-ph.EP

Madyson G. Barber, Andrew W. Mann, Andrew Vanderburg, Andrew W. Boyle, Ana Isabel Lopez Murillo

Comments: Accepted for publication in the Astronomical Journal
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:2505.06358 [astro-ph.EP] (or arXiv:2505.06358v1 [astro-ph.EP] for this version)
https://doi.org/10.48550/arXiv.2505.06358
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Submission history
From: Madyson Barber
[v1] Fri, 9 May 2025 18:03:48 UTC (7,349 KB)
https://arxiv.org/abs/2505.06358
Astrobiology,