J/A+A/622/L7        GJ143 and HD23472 radial velocity curves   (Trifonov+, 2019)

TESS exoplanet candidates validated with HARPS archival data. A massive Neptune around GJ143 and two Neptunes around HD23472. Trifonov T., Rybizki J., Kuerster M. <Astron. Astrophys. 622, L7 (2019)> =2019A&A...622L...7T 2019A&A...622L...7T (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities Keywords: techniques: radial velocities - planets and satellites: detection - planets and satellites: dynamical evolution and stability Abstract: We aim at the discovery of new planetary systems by exploiting the transit light-curve results from observations made in TESS orbital observatory Sectors 1 and 2 and validating them with precise Doppler measurements obtained from archival HARPS data. Taking advantage of the reported TESS transit events around GJ 143 (TOI 186) and HD 23472 (TOI 174), we modeled their HARPS precise Doppler measurements and derived orbital parameters for these two systems. Results. For the GJ 143 system, TESS has reported only a single transit, and thus its period is unconstrained from photometry. Our radial velocity analysis of GJ 143 reveals the full Keplerian solution of the system, which is consistent with an eccentric planet with a mass almost twice that of Neptune and a period of Pb=35.59±0.01-days. Our estimates of the GJ 143 b planet are fully consistent with the transit timing from TESS. We confirm the two-planet system around HD 23472, which according to our analysis is composed of two Neptune-mass planets in a possible 5:3 mean motion resonance. Description: The HARPS spectra of GJ 143 and HD23472 were reanalyzed by our team prior to the TESS observations with the ultimate goal to reanalyze all publicly available ESO HARPS spectra in order to derive uniformly processed HARPS-Doppler measurements and study possible small but significant instrument related RV systematics (i.e., Tal-Or et al. 2019MNRAS.484L...8T 2019MNRAS.484L...8T). Objects: ------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------ 03 26 59.22 -63 29 56.8 GJ 143 = HD 21749 03 41 50.40 -62 46 01.5 HD23472 = HD 23472 ------------------------------------------------ File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file tablea1.dat 73 58 HARPS Doppler and activity index measurements of GJ 143 tablea2.dat 73 14 HARPS Doppler and activity index measurements of HD 23472 -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea1.dat tablea2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1 A1 --- Note [*] Note (1) 3- 13 F11.3 d Epoch Epoch (JD) 15- 20 F6.3 m/s RV Radial velocity 22- 26 F5.3 m/s e_RV rms uncertainty on RV 28- 33 F6.4 --- Ha Hα activity index 35- 40 F6.4 --- e_Ha rms uncertainty on Hα 42- 49 F8.4 --- dLW Differential line width of the spectral lines 51- 56 F6.4 --- e_dLW rms uncertainty on dLW 58- 65 F8.4 m/s CRX RV chromaticity (wavelength dependence) 67- 73 F7.4 m/s e_CRX rms uncertainty on CRX -------------------------------------------------------------------------------- Note (1): * = HARPS Doppler measurements taken after the fibre upgrade. -------------------------------------------------------------------------------- Acknowledgements: Trifon Trifonov, trifonov(at)mpia.de
(End) Patricia Vannier [CDS] 24-Jan-2019
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