Two Earth-size planets and an Earth-size candidate transiting the nearby star HD 101581

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F25%3A00603206" target="_blank" >RIV/61389021:_____/25:00603206 - isvavai.cz</a>
Alternative codes found
RIV/67985815:_____/25:00603206 RIV/00216224:14310/25:00140471
Result on the web
<a href="https://hdl.handle.net/11104/0366035" target="_blank" >https://hdl.handle.net/11104/0366035</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-3881/ad9266" target="_blank" >10.3847/1538-3881/ad9266</a>

Result language
angličtina
Original language name
Two Earth-size planets and an Earth-size candidate transiting the nearby star HD 101581
Original language description
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 ( R-p=0.956(-0.061)(+0.063 )R(circle plus) , P = 4.47 days) and HD 101581c ( R-p=0.990(-0.070)(+0.070 )R(circle plus) , 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(circle plus), 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 (circle plus). HD 101581 is a promising system for atmospheric characterization and comparative planetology of small planets.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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