J/A+A/707/A106 TOI-1243, TOI-4529, TOI-5388 RV datasets (Poultourtzidis+, 2026)
Characterization of two new transiting sub-Neptunes and a terrestrial planet
around M-dwarf hosts.
Poultourtzidis E., Lacedelli G., Palle E., Carleo I., Magliano C.,
Geraldia-Gonzalez S., Caballero J.A., Morello G., Orell-Miquel J.,
Tabernero H.M., Murgas F., Covone G., Pozuelos F.J., Amado P.J.,
Bejar V.J.S., Chairetas S., Cifuentes C., Ciardi D.R., Collins K.A.,
Crossfield I.J.M., Esparza-Borges E., Fernandez-Rodriguez G., Fukui A.,
Hayashi Y., Hatzes A.P., Henning T., Herrero E., Horne K., Howell S.B.,
Isogai K., Jenkins J.M., Kawai Y., Libotte F., Matthews E.,
Meni-Gallardo P., Mireles I., Morales J.C., Narita N., Ogunwale B.B.,
Parviainen H., Quirrenbach A., Reiners A., Ribas I., Sefako R., Shporer A.,
Schwarz R.P., Srdoc G., Tal-Or L., Vanaverbeke S., Watanabe N.,
Watkins C.N., Zong Lang F.
<Astron. Astrophys. 707, A106 (2026)>
=2026A&A...707A.106P 2026A&A...707A.106P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Optical ; Infrared
Keywords: techniques: photometric - techniques: radial velocities -
planets and satellites: detection - stars: individual: TOI-1243 -
stars: individual: TOI-4529 - stars: individual: TOI-5388
Abstract:
We report the confirmation of three transiting exoplanets orbiting
TOI-1243 (LSPM J0902+7138), TOI-4529 (G 2-21) and TOI-5388 (Wolf
346) initially detected by TESS, through ground-based photometry and
radial-velocity follow-up measurements with CARMENES. The planets
present short orbital periods of 4.65, 5.88, and 2.59 days, and they
orbit early M dwarfs (M2.0 V, M1.5 V, and M3.0 V, respectively). We
were able to precisely determine the radius of all three planets with
a <7% precision, the mass of TOI-1243b with 19% precision and upper
mass limits for TOI-4529b and TOI-5388b. TOI-1243b has a radius of
2.33±0.12R⊕, a mass of 7.7±1.5M⊕, and a mean
density of 0.61±0.15ρ⊕. TOI-4529b has a radius of
1.77+0.09-0.08R⊕, a 3σ upper mass limit of 4.9
M_⊕ and a 3σ upper density limit of 0.88ρ⊕.
The third planet, TOI-5388b, is Earth-sized with a radius of
0.99+0.07-0.06R⊕, a 3σ upper mass limit of
2.2M⊕ and a 3σ upper density limit of 2.2ρ⊕.
While TOI-5388 b is most probably rocky, given its Earth-like radius,
TOI-1243 b and TOI-4529 b are located in a highly degenerate region in
the mass-radius space. TOI-4529 b appears to lean towards a
water-world composition. TOI-1243 b has enough mass to host a
significant H-He envelope, although a water-world and pure rocky
compositions are also consistent with the data. Our analysis indicates
that future atmospheric observations using JWST can aid into
determining their real composition. The sample of small planets around
M-dwards is widely used to understand planet formation and composition
theories, and our study adds 3 more planets to this sample.
Description:
CARMENES radial velocity and activity indicators of TOI-1243,
TOI-4529, TOI-5388.
Objects:
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RA (2000) DE Designation(s)
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09 02 55.83 +71 38 11.1 TOI-1243 = Gaia DR3 1119059574424538496
01 07 52.52 +12 52 51.5 TOI-4529 = Gaia DR3 2584622022068408576
10 08 42.36 +35 32 51.2 TOI-5388 = Gaia DR3 753585104807022080
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rv1243.dat 147 39 TOI-1243 RVs and activity indicators
rv4529.dat 147 62 TOI-4529 RVs and activity indicators
rv5388.dat 147 42 TOI-5388 RVs and activity indicators
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Byte-by-byte Description of file: rv1243.dat rv4529.dat rv5388.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d Time Barycentric Julian Date (BJD)
16- 21 F6.2 m/s RV Radial velocity
23- 26 F4.2 m/s e_RV Radial velocity uncertainty
28- 33 F6.4 --- Halpha H-alpha index
35- 40 F6.4 --- e_Halpha H-alpha index uncertainty
42- 47 F6.4 --- CaII-1 Calcium II IRT 1 index
49- 54 F6.4 --- e_CaII-1 Calcium II IRT 1 uncertainty
56- 61 F6.4 --- CaII-2 Calcium II IRT 2 index
63- 68 F6.4 --- e_CaII-2 Calcium II IRT 2 uncertainty
70- 75 F6.4 --- CaII-3 Calcium II IRT 3 index
77- 82 F6.4 --- e_CaII-3 Calcium II IRT 3 uncertainty
84- 89 F6.2 m/s CRX Chromatic index
91- 95 F5.2 m/s e_CRX Chromatic index uncertainty
97-103 F7.4 --- NaD1 Sodium D1 index
105-111 F7.4 --- e_NaD1 [] Sodium D1 index uncertainty
113-119 F7.4 --- NaD2 Sodium D2 index
121-127 F7.4 --- e_NaD2 [] Sodium D2 index uncertainty
129-134 F6.2 m2/s2 dLW Differential line width
136-140 F5.2 m2/s2 e_dLW Differential line width uncertainty
142-147 F6.2 --- SNR Signal-to-noise ratio
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Acknowledgements:
Efthymios Poultourtzidis, epoultou(at)physics.auth.gr
(End) Patricia Vannier [CDS] 27-Dec-2025