J/A+A/650/A188 G 264-012 and Gl 393 radial velocity curves (Amado+, 2021)
The CARMENES search for exoplanets around M dwarfs. Two terrestrial planets
orbiting G 264-012 and one terrestrial planet orbiting Gl 393.
Amado P.J., Bauer F.F., Rodriguez Lopez C., Rodriguez E.,
Cardona Guillen C., Perger M., Caballero J.A., Lopez-Gonzalez M.J.,
Munoz- Rodriguez I., Pozuelos F.J., Sanchez-Rivero A., Schlecker M.,
Quirrenbach A., Ribas I., Reiners A., Almenara J., Astudillo-Defru N.,
Azzaro M., Bejar V.J.S., Bohemann R., Bonfils X., Bouchy F., Cifuentes C.,
Cortes-Contreras M., Delfosse X., Dreizler S., Forveille T., Hatzes A.P.,
Henning T., Jeffers S.V., Kaminski A., Kuerster M., Lafarga M., Lodieu N.,
Lovis C., Mayor M., Montes D., Morales J.C., Morales N., Murgas F.,
Ortiz J.L., Palle E., Pepe F., Perdelwitz V., Pollaco D., Santos N.C.,
Schoefer P., Schweitzer A., Segransan N.C., Shan Y., Stock S., Tal-Or L.,
Udry S., Zapatero Osorio M.R., Zechmeister M.
<Astron. Astrophys. 650, A188 (2021)>
=2021A&A...650A.188A 2021A&A...650A.188A (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Stars, dwarfs ;
Stars, M-type ; Radial velocities
Keywords: planets and satellites: detection -
planets and satellites: individual: G 264-012 b -
planets and satellites: individual: G 264-012 c -
planets and satellites: individual: Gl 393 b
Abstract:
We report the discovery of two planetary systems, namely G 264-012, an
M4.0 dwarf with two terrestrial planets
(Mbsini=2.50+0.29-0.30M☉ and
Mcsini=3.75+0.48-0.47M☉), and Gl 393, a bright M2.0 dwarf
with one terrestrial planet (Mbsini=1.71±0.24M☉). Although
both stars were proposed to belong to young stellar kinematic groups,
we estimate their ages to be older than about 700Ma.
The two planets around G 264-012 were discovered using only
radial-velocity (RV) data from the CARMENES exoplanet survey, with
estimated orbital periods of 2.30d and 8.05d, respectively.
Photometric monitoring and analysis of activity indicators reveal a
third signal present in the RV measurements, at about 100d, caused by
stellar rotation.
The planet Gl 393b was discovered in the RV data from the HARPS,
CARMENES, and HIRES instruments. Its identification was only possible
after modelling, with a Gaussian process (GP), the variability
produced by the magnetic activity of the star.
For the earliest observations, this variability produced a forest of
peaks in the periodogram of the RVs at around the 34d rotation
period determined from Kepler data, which disappeared in the
latest epochs. After correcting for them with this GP model, a
significant signal showed at a period of 7.03d.
No significant signals in any of our spectral activity indicators or
contemporaneous photometry were found at any of the planetary periods.
Given the orbital and stellar properties, the equilibrium temperatures
of the three planets are all higher than that for Earth.
Current planet formation theories suggest that these two systems
represent a common type of architecture. This is consistent with
formation following the core accretion paradigm.
Description:
We tabulate the radial velocity (RV) time series (BJD) of the stars G
264-012 and Gl 393, the error of each RV measurement and the
instrument with which it was acquired.
Objects:
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RA (2000) DE Designation(s)
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21 46 40.24 +66 48 10.6 G 264-012 = NLTT 52122
10 28 55.55 +00 50 27.6 Gl 393 = BD+01 2447
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 35 305 G 264-012 radial velocity data
tableb2.dat 35 334 Gl 393 radial velocity data
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Byte-by-byte Description of file: tableb1.dat tableb2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD Barycentric Julian Date
15- 20 F6.2 m/s RV Radial velocity measurement
22- 26 F5.2 m/s e_RV Error in the radial velocity measurement
28- 35 A8 --- Inst Instrument used
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Acknowledgements:
Pedro Amado, pja(at)iaa.csic.es
(End) Patricia Vannier [CDS] 28-May-2021