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. Colón; Jeffrey D. Crane; Tansu Daylan; Matías R. Díaz; John P. Doty; Fabo Feng; Eike W. Guenther; Jonathan Horner; Steve B. Howell; Jan Janik; Hugh R.A. Jones; Petr Kabáth; Shubham Kanodia; Colin Littlefield; Hugh P. Osborn; Simon O’Toole; Martin Paegert; Pavel Pintr; Richard P. Schwarz; Steve Shectman; Gregor Srdoc; Keivan G. Stassun; Johanna K. Teske; Joseph D. Twicken; Leonardo Vanzi; Sharon X. Wang; Robert A. Wittenmyer; Jon M. Jenkins; George R. Ricker; Sara Seager; Joshua Winn

doi:10.3847/1538-3881/ad9266

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. Colón, Jeffrey D. Crane, Tansu Daylan, Matías R. Díaz, John P. DotyFabo Feng, Eike W. Guenther, Jonathan Horner, Steve B. Howell, Jan Janik, Hugh R.A. Jones, Petr Kabáth, Shubham Kanodia, Colin Littlefield, Hugh P. Osborn, Simon O’Toole, Martin Paegert, Pavel Pintr, Richard P. Schwarz, Steve Shectman, Gregor Srdoc, Keivan G. Stassun, Johanna K. Teske, Joseph D. Twicken, Leonardo Vanzi, Sharon X. Wang, Robert A. Wittenmyer, Jon M. Jenkins, George R. Ricker, Sara Seager, Joshua Winn

Astrophysical Sciences

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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 ( R p = 0.956 − 0.061 + 0.063 R ⊕ , P = 4.47 days) and HD 101581c ( R p = 0.990 − 0.070 + 0.070 R ⊕ , 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 ⊕ , 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.

Original language	English (US)
Article number	47
Journal	Astronomical Journal
Volume	169
Issue number	1
DOIs	https://doi.org/10.3847/1538-3881/ad9266
State	Published - Jan 1 2025

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-3881/ad9266

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Kunimoto, M., Lin, Z., Millholland, S., Venner, A., Hinkel, N. R., Shporer, A., Vanderburg, A., Bailey, J., Brahm, R., Burt, J. A., Butler, R. P., Carter, B., Ciardi, D. R., Collins, K. A., Collins, K. I., Colón, K. D., Crane, J. D., Daylan, T., Díaz, M. R., ... Winn, J. (2025). Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581. Astronomical Journal, 169(1), Article 47. https://doi.org/10.3847/1538-3881/ad9266

@article{b1ee9e0e15ca4a86a6bce593ca5fd45e,

title = "Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581",

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 ( R p = 0.956 − 0.061 + 0.063 R ⊕ , P = 4.47 days) and HD 101581c ( R p = 0.990 − 0.070 + 0.070 R ⊕ , 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 ⊕ , 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.",

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 = "Publisher Copyright: {\textcopyright} 2024. The Author(s). Published by the American Astronomical Society.",

year = "2025",

month = jan,

day = "1",

doi = "10.3847/1538-3881/ad9266",

language = "English (US)",

volume = "169",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "1",

}

Kunimoto, M, Lin, Z, Millholland, S, Venner, A, Hinkel, NR, Shporer, A, Vanderburg, A, Bailey, J, Brahm, R, Burt, JA, Butler, RP, Carter, B, Ciardi, DR, Collins, KA, Collins, KI, Colón, KD, Crane, JD, Daylan, T, Díaz, MR, Doty, JP, Feng, F, Guenther, EW, Horner, J, Howell, SB, Janik, J, Jones, HRA, Kabáth, P, Kanodia, S, Littlefield, C, Osborn, HP, O’Toole, S, Paegert, M, Pintr, P, Schwarz, RP, Shectman, S, Srdoc, G, Stassun, KG, Teske, JK, Twicken, JD, Vanzi, L, Wang, SX, Wittenmyer, RA, Jenkins, JM, Ricker, GR, Seager, S & Winn, J 2025, 'Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581', Astronomical Journal, vol. 169, no. 1, 47. https://doi.org/10.3847/1538-3881/ad9266

TY - JOUR

T1 - Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581

AU - Kunimoto, Michelle

AU - Lin, Zifan

AU - Millholland, Sarah

AU - Venner, Alexander

AU - Hinkel, Natalie R.

AU - Shporer, Avi

AU - Vanderburg, Andrew

AU - Bailey, Jeremy

AU - Brahm, Rafael

AU - Burt, Jennifer A.

AU - Butler, R. Paul

AU - Carter, Brad

AU - Ciardi, David R.

AU - Collins, Karen A.

AU - Collins, Kevin I.

AU - Colón, Knicole D.

AU - Crane, Jeffrey D.

AU - Daylan, Tansu

AU - Díaz, Matías R.

AU - Doty, John P.

AU - Feng, Fabo

AU - Guenther, Eike W.

AU - Horner, Jonathan

AU - Howell, Steve B.

AU - Janik, Jan

AU - Jones, Hugh R.A.

AU - Kabáth, Petr

AU - Kanodia, Shubham

AU - Littlefield, Colin

AU - Osborn, Hugh P.

AU - O’Toole, Simon

AU - Paegert, Martin

AU - Pintr, Pavel

AU - Schwarz, Richard P.

AU - Shectman, Steve

AU - Srdoc, Gregor

AU - Stassun, Keivan G.

AU - Teske, Johanna K.

AU - Twicken, Joseph D.

AU - Vanzi, Leonardo

AU - Wang, Sharon X.

AU - Wittenmyer, Robert A.

AU - Jenkins, Jon M.

AU - Ricker, George R.

AU - Seager, Sara

AU - Winn, Joshua

PY - 2025/1/1

Y1 - 2025/1/1

N2 - 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 ⊕ , P = 4.47 days) and HD 101581c ( R p = 0.990 − 0.070 + 0.070 R ⊕ , 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 ⊕ , 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.

AB - 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 ⊕ , P = 4.47 days) and HD 101581c ( R p = 0.990 − 0.070 + 0.070 R ⊕ , 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 ⊕ , 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.

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UR - http://www.scopus.com/inward/citedby.url?scp=86000184921&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/ad9266

DO - 10.3847/1538-3881/ad9266

M3 - Article

AN - SCOPUS:86000184921

SN - 0004-6256

VL - 169

JO - Astronomical Journal

JF - Astronomical Journal

IS - 1

M1 - 47

ER -

Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581

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