| Ամփոփում: | 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.
|
|---|