@article{3e1ac7bf4b1b447fbce343841a2a06b6,
title = "Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581 * * This paper includes data gathered with the 6.5 meter Magellan Telescopes located at Las Campanas Observatory, Chile",
abstract = "We report the validation of multiple planets transiting the nearby (d = 12.8 pc) K5V dwarf HD 101581 (GJ 435, TOI–6276, TIC 397362481). This system consists of at least two Earth-size planets whose orbits are near a mutual 4:3 mean-motion resonance, HD 101581 b ( Rp=0.956−0.061+0.063R⊕ , P = 4.47 days) and HD 101581c ( Rp=0.990−0.070+0.070R⊕ , P = 6.21 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 ( Rp=0.982−0.098+0.114R⊕ , P = 7.87 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 multiplanet systems. At V = 7.77, HD 101581 is the brightest star known to host multiple transiting planets smaller than 1.5 R ⊕. HD 101581 is a promising system for atmospheric characterization and comparative planetology of small planets.",
keywords = "Exoplanet dynamics, Exoplanets, Transit photometry, Exoplanet systems",
author = "Michelle Kunimoto and Zifan Lin and Sarah Millholland and Alexander Venner and Hinkel, {Natalie R.} and Avi Shporer and Andrew Vanderburg and Jeremy Bailey and Rafael Brahm and Burt, {Jennifer A.} and Butler, {R. Paul} and Brad Carter and Ciardi, {David R.} and Collins, {Karen A.} and Collins, {Kevin I.} and Col{\'o}n, {Knicole D.} and Crane, {Jeffrey D.} and Tansu Daylan and D{\'i}az, {Mat{\'i}as R.} and Doty, {John P.} and Fabo Feng and Guenther, {Eike W.} and Jonathan Horner and Howell, {Steve B.} and Jan Janik and Jones, {Hugh R. A.} and Petr Kab{\'a}th and Shubham Kanodia and Colin Littlefield and Osborn, {Hugh P.} and Simon O{\textquoteright}Toole and Martin Paegert and Pavel Pintr and Schwarz, {Richard P.} and Steve Shectman and Gregor Srdoc and Stassun, {Keivan G.} and Teske, {Johanna K.} and Twicken, {Joseph D.} and Leonardo Vanzi and Wang, {Sharon X.} and Wittenmyer, {Robert A.} and Jenkins, {Jon M.} and Ricker, {George R.} and Sara Seager and Joshua Winn",
note = "{\textcopyright} 2024 The Author(s). Published by the American Astronomical Society. This is an open access article distributed under the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/ ",
year = "2025",
month = jan,
day = "1",
doi = "10.3847/1538-3881/ad9266",
language = "English",
volume = "169",
pages = "1--19",
journal = "The Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "1",
}