Discovery and mass measurement of the hot, transiting, Earth-sized planet, GJ 3929 b
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aa42653-21.pdf
Description
Published version
Size
2.95 MB
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Adobe PDF
Checksum (MD5)
a914a84a3e2d9127d63f95b9e2417c4f
Author(s)
Seager, Sara
Date Issued
2022
Journal
Astronomy and Astrophysics
Publisher
EDP Sciences
Citation
Seager, Sara. 2022. "Discovery and mass measurement of the hot, transiting, Earth-sized planet, GJ 3929 b." Astronomy and Astrophysics, 659.
Version
Final published version
Abstract
We report the discovery of GJ 3929 b, a hot Earth-sized planet orbiting the nearby M3.5 V dwarf star, GJ 3929 (G 180-18, TOI2013). Joint modelling of photometric observations from TESS sectors 24 and 25 together with 73 spectroscopic observations from
CARMENES and follow-up transit observations from SAINT-EX, LCOGT, and OSN yields a planet radius of Rb = 1.150 ± 0.040 R⊕, a
mass of Mb = 1.21 ± 0.42 M⊕, and an orbital period of Pb = 2.6162745 ± 0.0000030 d. The resulting density of ρb = 4.4 ± 1.6 g cm−3
is compatible with the Earth’s mean density of about 5.5 g cm−3
. Due to the apparent brightness of the host star (J = 8.7 mag) and
its small size, GJ 3929 b is a promising target for atmospheric characterisation with the JWST. Additionally, the radial velocity
data show evidence for another planet candidate with P[c] = 14.303 ± 0.035 d, which is likely unrelated to the stellar rotation period,
Prot = 122 ± 13 d, which we determined from archival HATNet and ASAS-SN photometry combined with newly obtained TJO data.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1051/0004-6361/202142653
