J/A+A/668/A158 HD 20329 Radial velocity and activity indices (Murgas+, 2022)
HD 20329b: An ultra-short-period planet around a solar-type star found by TESS.
Murgas F., Nowak G., Masseron T., Parviainen H., Luque R., Palle E.,
Korth J., Carleo I., Csizmadia Sz., Esparza-Borges E., Alqasim A.,
Cochran W.D., Dai F., Deeg H.J., Gandolfi D., Goffo E., Kabath P.,
Lam K.W.F., Livingston J., Muresan A., Osborne H.L.M., Persson C.M.,
Serrano L.M., Smith A.M.S., Van Eylen V., Orell-Miquel J., Hinkel N.R.,
Galan D., Puig-Subira M., Stangret M., Fukui A., Kagetani T., Narita N.,
Ciardi D.R., Boyle A.W., Ziegler C., Briceno C., Law N., Mann A.W.,
Jenkins J.M., Latham D.W., Quinn S.N., Ricker G., Seager S., Shporer A.,
Ting E.B., Vanderspek R., Winn J.N.
<Astron. Astrophys. 668, A158 (2022)>
=2022A&A...668A.158M 2022A&A...668A.158M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Optical ; Spectroscopy
Keywords: planets and satellites: detection - techniques: radial velocities -
techniques: photometric
Abstract:
Ultra-short-period (USP) planets are defined as planets with orbital
periods shorter than one day. This type of planets is rare, highly
irradiated, and interesting because their formation history is
unknown.
We aim to obtain precise mass and radius measurements to confirm the
planetary nature of a USP candidate found by the Transiting Exoplanet
Survey Satellite (TESS). These parameters can provide insights into
the bulk composition of the planet candidate and help to place
constraints on its formation history.
We used TESS light curves and HARPS-N spectrograph radial velocity
measurements to establish the physical properties of the transiting
exoplanet candidate found around the star HD 20329 (TOI-4524). We
performed a joint fit of the light curves and radial velocity time
series to measure the mass, radius, and orbital parameters of the
candidate.
We confirm and characterize HD 20329b, an ultra-short-period planet
transiting a solar-type star. The host star (HD 20329, V=8.74mag,
J=7.5mag) is characterized by its G5 spectral type with
M*=0.90±0.05M☉, R*=1.13±0.02R☉, and Teff=5596±50K;
it is located at a distance d=63.68±0.29pc. By jointly fitting the
available TESS transit light curves and follow-up radial velocity
measurements, we find an orbital period of 0.9261±(0.5x10-4)days,
a planetary radius of Rp=1.72±0.07 R{earth}, and a mass of
Mp=7.42±1.09M{earth}, implying a mean density of
8.06±1.53g/cm3. HD 20329b joins the ∼30 currently known USP
planets with radius and Doppler mass measurements.
Description:
Radial velocity and activity indices of HD 20329 taken with
TNG/HARPS-N. Spectroscopic data reduced with HARPS DRS and SERVAL.
Objects:
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RA (2000) DE Designation(s)
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03 16 42.63 +15 39 26.0 HD 20329 = BD+15 459
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 82 120 HARPS-N DRS derived values
tablea2.dat 94 120 HARPS-N SERVAL derived values
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.5 d BJD Barycentric Julian date (BJD-2457000) TDB
12- 21 F10.3 m/s RV Radial velocity
23- 27 F5.3 m/s e_RV Radial velocity error
29- 35 F7.3 m/s BIS CCF Bisector velocity span
37- 41 F5.3 m/s e_BIS CCF Bisector velocity span uncertainty
43- 47 F5.3 km/s FWHM CCF FWHM
49- 54 F6.3 % CTR CCF contrast
56- 62 F7.4 [-] logRhk LogRhk activity index
64- 69 F6.4 [-] e_logRhk LogRhk activity index uncertainty
71- 75 F5.1 --- SNR-550nm Signal-to-noise ratio at 550nm
77- 82 F6.1 s Texp Exposure time
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 10 F10.5 d BJD Barycentric Julian date (BJD 2457000) TBD
12- 17 F6.3 m/s RV Radial velocity
19- 23 F5.3 m/s e_RV Radial velocity error
25- 31 F7.3 --- CRX Chromatic index (in m/s/Np)
33- 38 F6.3 --- e_CRX Chromatic index uncertainty(in m/s/Np)
40- 46 F7.3 m2/s2 dLW Differential line width
48- 52 F5.3 m2/s2 e_dLW Differential line width uncertainty
54- 59 F6.4 --- Halpha Hα index
61- 66 F6.4 --- e_Halpha Hα index uncertainty
68- 73 F6.4 --- NaD1 Na D1 index
75- 80 F6.4 --- e_NaD1 Na D1 index uncertainty
82- 87 F6.4 --- NaD2 Na D2 index
89- 94 F6.4 --- e_NaD2 Na D2 index uncertainty
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Acknowledgements:
Felipe Murgas, fmurgas(at)iac.es
(End) Felipe Murgas [IAC, Spain], Patricia Vannier [CDS] 10-Nov-2022