2025AJ....169...47K

Query : 2025AJ....169...47K

2025AJ....169...47K - Astron. J., 169, 47 (2025/January-0)

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

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., COLON K.D., CRANE J.D., DAYLAN T., DIAZ M.R., DOTY J.P., FENG F., GUENTHER E.W., HORNER J., HOWELL S.B., JANIK J., JONES H.R.A., KABATH P., KANODIA S., LITTLEFIELD C., OSBORN H.P., O'TOOLE S., PAEGERT M., PINTR P., SCHWARZ R.P., SHECTMAN S., SRDOC G., STASSUN K.G., TESKE J.K., TWICKEN J.D., VANZI L., WANG S.X., WITTENMYER R.A., JENKINS J.M., RICKER G.R., SEAGER S. and WINN J.

Abstract (from CDS):

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 (${R}_{p}={0.956}_{-0.061}^{+0.063}\,{R}_{\oplus }$, P = 4.47 days) and HD 101581c (${R}_{p}={0.990}_{-0.070}^{+0.070}\,{R}_{\oplus }$, 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 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.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanet systems - Exoplanet dynamics - Exoplanets - Transit photometry

VizieR on-line data: <Available at CDS (J/AJ/169/47): table2.dat>

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 BD-17 588A PM* 03 01 51.3936681048 -16 35 36.031178525 13.444 12.191 10.529 9.364 7.887 M3V 113 0
2 HD 23472 PM* 03 41 50.3987760888 -62 46 01.477226928   10.80 9.72     K3.5V 77 0
3 NAME UPM J0505-4756b Pl 05 05 14.4284259960 -47 56 15.526276908           ~ 25 0
4 L 98-59 PM* 08 18 07.6214406393 -68 18 46.805365587   13.22 11.685 11.294 9.25 M3V 135 0
5 NAME L 98-59 b Pl 08 18 07.6214406393 -68 18 46.805365587           ~ 67 0
6 * rho01 Cnc e Pl 08 52 35.8111044043 +28 19 50.954994470           ~ 682 1
7 * rho01 Cnc PM* 08 52 35.8111044043 +28 19 50.954994470 7.45 6.82   5.4   K0IV-V 1223 1
8 CD-45 5378b Pl 09 44 29.8367689785 -45 46 35.427639685           ~ 86 0
9 HD 85512 PM* 09 51 07.0518026760 -43 30 10.023686079 9.963 8.83 7.651 6.934 6.319 K6Vk: 250 1
10 HD 101581c Pl 11 41 02.4684650438 -44 24 18.686737705           ~ 2 0
11 HD 101581b Pl 11 41 02.4684650438 -44 24 18.686737705           ~ 2 0
12 HD 101581 PM* 11 41 02.4684650438 -44 24 18.686737705 9.753 8.833 7.762 7.127 6.584 K4.5Vk: 128 0
13 TOI-6276.03 Pl? 11 41 02.4684650438 -44 24 18.686737705           ~ 2 0
14 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0

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