Two Earth-size Planets and an Earth-size Candidate Transiting the Nearby Star HD 101581
Michelle Kunimoto, Zifan Lin, Sarah Millholland, Alexander Venner,, Natalie R. Hinkel, Avi Shporer, Andrew Vanderburg, Jeremy Bailey, Rafael, Brahm, Jennifer A. Burt, R. Paul Butler, Brad Carter, David R. Ciardi, Karen, A. Collins, Kevin I. Collins, Knicole D. Colon

TL;DR
This paper validates a multi-planet system around the nearby star HD 101581, discovering two Earth-sized planets and a candidate, highlighting a compact, uniform system ideal for atmospheric studies.
Contribution
The study confirms multiple small transiting planets around HD 101581, including a new candidate, using TESS data and ground follow-up, demonstrating a rare, well-characterized system of Earth-sized planets.
Findings
Two confirmed Earth-sized planets near 4:3 resonance
Identification of a third potential transiting planet
System's brightness makes it ideal for atmospheric studies
Abstract
We report the validation of multiple planets transiting the nearby ( pc) K5V dwarf HD 101581 (GJ 435, TOI-6276, TIC 397362481). The system consists of at least two Earth-size planets whose orbits are near a mutual 4:3 mean-motion resonance, HD 101581 b (, days) and HD 101581 c (, days). Both planets were discovered in Sectors 63 and 64 TESS observations and statistically validated with supporting ground-based follow-up. We also identify a signal that probably originates from a third transiting planet, TOI-6276.03 (, days). These planets are remarkably uniform in size and their orbits are evenly spaced, representing a prime example of the "peas-in-a-pod" architecture seen in other compact multi-planet systems. At $V…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astro and Planetary Science
