J/A+A/637/A93 HD 79211 CARMENES radial velocities (Gonzalez-Alvarez+, 2020)
The CARMENES search for exoplanets around M dwarfs.
A super-Earth planet orbiting HD 79211 (GJ 338 B).
Gonzalez-Alvarez E., Zapatero Osorio M.R., Caballero J.A., Sanz-Forcada J.,
Bejar V.J.S., Gonzalez-Cuesta L., Dreizler S., Bauer F.F., Rodriguez E.,
Tal-Or L., Zechmeister M., Montes D., Lopez-Gonzalez M.J., Ribas I.,
Reiners A., Quirrenbach A., Amado P.J., Anglada-Escude G., Azzaro M.,
Cortes-Contreras M., Hatzes A.P., Henning T., Jeffers S.V., Kaminski A.,
Kuerster M., Lafarga M., Morales J.C., Palle E., Perger M., Schmitt J.H.M.M.
<Astron. Astrophys. 637, A93 (2020)>
=2020A&A...637A..93G 2020A&A...637A..93G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Stars, M-type ; Exoplanets ;
Radial velocities
Keywords: binaries, visual - stars, late-type - planetary systems
Abstract:
We report on radial velocity time series for two M0.0V stars, GJ 338 B
and GJ 338 A, using the CARMENES spectrograph, complemented by
ground-telescope photometry from Las Cumbres and Sierra Nevada
observatories. We obtained 159 and 70 radial velocity measurements of
GJ 338 B and A, respectively, with the CARMENES visible channel
between 2016 January and 2018 October. We also compiled additional
relative radial velocity measurements from the literature and a
collection of astrometric data that cover 200yr of observations to
solve for the binary orbit. We found dynamical masses of
0.64±0.07M☉ for GJ338B and 0.69±0.07M☉ for GJ338A. The
CARMENES radial velocity periodograms show significant peaks at
16.61±0.04d (GJ 338 B) and 16.3±3.5d (GJ 338 A), which have
counterparts at the same frequencies in CARMENES activity indicators
and photometric light curves. We attribute these to stellar rotation.
GJ 338 B shows two additional, significant signals at 8.27±0.01 and
24.45±0.02d, with no obvious counterparts in the stellar activity
indices. The former is likely the first harmonic of the star's
rotation, while we ascribe the latter to the existence of a
super-Earth planet with a minimum mass of 10.27±1.47M⊕
orbiting GJ 338 B.
Description:
Detailed CARMENES RV analysis of the M0.0 V stars GJ 338 A (HD 79210)
and GJ 338 B (HD 79211), a wide binary system with similar mass
stellar components.
New RVs were obtained for each member of the stellar binary using the
CARMENES fibre-fed, echelle spectrograph. CARMENES is installed at
the 3.5m telescope of the Calar Alto Observatory in Almeria (Spain).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 167 159 GJ 338 B data of the CARMENES observations
tableb2.dat 89 70 GJ 338 A data of the CARMENES observations
tableb3.dat 66 67 Relative and differential RVs for binary GJ338AB
computed with common template (GJ338B)
tableb4.dat 27 122 Relative radial velocity measurements of GJ338B
with CARMENES in the NIR
tableb5.dat 36 561 Relative astrometric position of the binary
companion GJ 338 B to GJ 338 A
tableb6.dat 190 189 References in tableb5
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Byte-by-byte Description of file: tableb1.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
22- 26 F5.2 m/s e_RV Error on Radial velocity
28- 34 F7.2 m2/s2 dLW ? Differential line width
36- 41 F6.2 m2/s2 e_dLW ? Error on Differential line width
43- 50 F8.4 --- Halpha ? Halpha
52- 59 F8.4 --- e_Halpha ? Error on Halpha
61- 66 F6.2 km/s FWHM ? Full width high maximum
68- 73 F6.2 km/s e_FWHM ? Error on Full width high maximum
75- 80 F6.2 --- Contrast ? Contrast
82- 87 F6.2 --- e_Contrast ? Error on Contrast
89- 96 F8.3 km/s BIS ? Bisector span
98-104 F7.3 km/s e_BIS ? Error on Bisector span
106-112 F7.3 --- IRT1 ? CaII triplet 8498Å activity indicator
114-120 F7.3 --- e_IRT1 ? Error on CaII triplet 8498Å
122-128 F7.3 --- IRT2 ? CaII triplet 8542Å activity indicator
130-136 F7.3 --- e_IRT2 ? Error on CaII triplet 8542Å
138-144 F7.3 --- IRT3 ? CaII triplet 8662Å activity indicator
146-152 F7.3 --- e_IRT3 ? Error on CaII triplet 8662Å
154-160 F7.2 m/s CRX ? Chromatic index, in m/(dex.s) unit
162-167 F6.2 m/s e_CRX ? Error on Chromatic index, in m/(dex.s) unit
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Byte-by-byte Description of file: 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
22- 26 F5.2 m/s e_RV Error on Radial velocity
28- 33 F6.2 m2/s2 dLW Differential line width
35- 39 F5.2 m2/s2 e_dLW Error on Differential line width
41- 46 F6.4 --- Halpha Halpha
48- 53 F6.4 --- e_Halpha Error on Halpha
55- 59 F5.3 --- IRT1 CaII triplet 8498Å
61- 65 F5.3 --- e_IRT1 Error on CaII triplet 8498Å
67- 71 F5.3 --- IRT2 CaII triplet 8542Å
73- 77 F5.3 --- e_IRT2 Error on CaII triplet 8542Å
79- 83 F5.3 --- IRT3 CaII triplet 8662Å
85- 89 F5.3 --- e_IRT3 Error on CaII triplet 8662Å
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Byte-by-byte Description of file: tableb3.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD Barycentric Julian date
16- 23 F8.2 m/s RVA Radial velocity GJ338A
25- 28 F4.2 m/s e_RVA Error on Radial velocity GJ338A
30- 37 F8.3 m/s RVB Radial velocity GJ338B
39- 42 F4.2 m/s e_RVB Error on Radial velocity GJ338B
44- 52 F9.3 m/s RVA-RVB Differential RVs for binary GJ338AB
computed with common template (GJ338B)
54- 57 F4.2 m/s e_RVA-RVB Error on differential RVs for binary GJ338AB
computed with common template (GJ338B)
59- 66 A8 --- Inst Instrument name
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Byte-by-byte Description of file: tableb4.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD Barycentric Julian date
15- 21 F7.2 m/s RV Radial velocity in the NIR
23- 27 F5.2 m/s e_RV Error on Radial velocity in the NIR
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Byte-by-byte Description of file: tableb5.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 a Epoch Epoch
11- 17 F7.3 deg theta Position angle
19- 25 F7.4 arcsec rho Separation
27- 36 A10 --- Ref Reference, in tableb6.dat
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Byte-by-byte Description of file: tableb6.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Ref Reference
12- 30 A19 --- BibCode BibCode
32- 58 A27 --- Aut Authors' name
60-190 A131 --- Com Comments
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Acknowledgements:
Esther Gonzalez-Alvarez, egonzalez(at)cab.inta-csic.es
(End) E. Gonzalez-Alvarez [CAB, CSIC-INTA], P. Vannier [CDS] 19-Mar-2020