Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581
Article
Article Title | Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581 |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Kunimoto, Michelle, Lin, Zifan, Millholland, Sarah, Venner, Alexander, Hinkel, Natalie R., Shporer, Shporer, Vanderburg, A., Bailey, Jeremy, Brahm, Rafael, Burt, Jennifer A., Butler, R. Paul, Carter, Brad, Ciardi, David R., Collins, Karen A., Collins, Kevin I., Colon, Knicole D., Crane, Jeffrey D., Daylan, Tansu, Diaz, Matías R., Doty, John P., Feng, Fabo, Guenther, Eike W., Horner, Jonathan, Howell, Steve B., Janik, Jan, Jones, Hugh R. A., Kabath, Petr, Kanodia, Shubham, Littlefield, Colin, Osborn, Hugh P., O'Toole, Simon, Paegert, Martin, Pintr, Pavel, Schwarz, Richard P., Shectman, Steve, Srdoc, Gregor, Stassun, Keivan G., Teske, Johanna K., Twicken, Joseph D., Vanzi, Leonardo, Wang, Sharon X., Wittenmyer, Robert A., Jenkins, Jon M., Ricker, George R., Seager, Sara and Winn, Joshua |
Journal Title | The Astronomical Journal |
Journal Citation | 169 |
Article Number | 47 |
Number of Pages | 19 |
Year | 2025 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ad9266 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ad9266 |
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 meanmotion resonance, HD 101581 b ( = - + Rp 0.956 0.061 RÅ 0.063 , P = 4.47 days) and HD 101581c ( = - + Rp 0.990 0.070 RÅ 0.070 , P = 6.21 days). Both planets were discovered in Sectors 63 and 64 TESS observations and statistically validated withWe 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 meanmotion resonance, HD 101581 b ( = - + Rp 0.956 0.061 RÅ 0.063 , P = 4.47 days) and HD 101581c ( = - + Rp 0.990 0.070 RÅ 0.070 , 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 RÅ 0.114 , 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 systems; Transit photometry; Exoplanets; Exoplanet dynamics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | Massachusetts Institute of Technology, United States |
Centre for Astrophysics | |
Louisiana State University, United States | |
University of New South Wales | |
Adolfo Ibanez University, Chile | |
Millennium Institute for Astrophysics, Chile | |
Data Observatory Foundation, Chile | |
California Institute of Technology (Caltech), United States | |
Carnegie Institution for Science, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
George Mason University, United States | |
NASA Goddard Space Flight Center, United States | |
University of Washington, United States | |
Carnegie Institution of Washington, United States | |
Noqsi Aerospace, United States | |
Shanghai Jiao Tong University, China | |
Thuringian State Observatory, Germany | |
NASA Ames Research Center, United States | |
Masaryk University, Czech Republic | |
University of Hertfordshire, United Kingdom | |
Astronomical Institute of the Czech Academy of Sciences, Czech Republic | |
Bay Area Environmental Research Institute, United States | |
University of Bern, Switzerland | |
ETH Zurich, Switzerland | |
Macquarie University | |
Institute of Plasma Physics of Czech Academy of Sciences, Czech Republic | |
Kotizarovci Observatory, Croatia | |
Vanderbilt University, United States | |
SETI Institute, United States | |
Pontifical Catholic University of Valparaiso, Chile | |
Tsinghua University, China | |
Princeton University, United States |
https://research.usq.edu.au/item/zv35q/two-earth-size-planets-and-an-earth-size-candidate-transiting-the-nearby-star-hd-101581
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