The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc
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aa43834-22.pdf
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Published version
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10.07 MB
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Author(s)
Seager, Sara
Date Issued
2022
Journal
Astronomy and Astrophysics
Publisher
EDP Sciences
Citation
Seager, Sara. 2022. "The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc." Astronomy and Astrophysics, 664.
Version
Final published version
Abstract
We report the discovery of a multiplanetary system transiting the M0 V dwarf HD 260655 (GJ 239, TOI-4599). The system consists
of at least two transiting planets, namely HD 260655 b, with a period of 2.77 d, a radius of Rb = 1.240 ± 0.023 R⊕, a mass of Mb =
2.14 ± 0.34 M⊕, and a bulk density of ρb = 6.2 ± 1.0 g cm−3
, and HD 260655 c, with a period of 5.71 d, a radius of Rc = 1.533+0.051
−0.046 R⊕,
a mass of Mc = 3.09 ± 0.48 M⊕, and a bulk density of ρc = 4.7
+0.9
−0.8
g cm−3
. The planets have been detected in transit by the Transiting
Exoplanet Survey Satellite (TESS) mission and confirmed independently with archival and new precise radial velocities obtained with
the HIRES and CARMENES instruments since 1998 and 2016, respectively. At a distance of 10 pc, HD 260655 has become the fourth
closest known multitransiting planet system after HD 219134, LTT 1445 A, and AU Mic. Due to the apparent brightness of the host
star (J = 6.7 mag), both planets are among the most suitable rocky worlds known today for atmospheric studies with the James Webb
Space Telescope, both in transmission and emission.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1051/0004-6361/202243834
