Kavli Affiliate: George R. Ricker
| First 5 Authors: Michelle Kunimoto, Zifan Lin, Sarah Millholland, Alexander Venner, Natalie R. Hinkel
| Summary:
We report the validation of multiple planets transiting the nearby ($d =
12.8$ 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 ($R_{p} =
0.956_{-0.061}^{+0.063}~R_{oplus}$, $P = 4.47$ days) and HD 101581 c ($R_{p} =
0.990_{-0.070}^{+0.070}~R_{oplus}$, $P = 6.21$ 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 ($R_{p} =
0.982_{-0.098}^{+0.114}~R_{oplus}$, $P = 7.87$ 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
multi-planet systems. At $V = 7.77$, HD 101581 is the brightest star known to
host multiple transiting planets smaller than $1.5~R_{oplus}$. HD 101581 is a
promising system for atmospheric characterization and comparative planetology
of small planets.
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