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:
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RA (2000) DE Designation(s)
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03 26 59.22 -63 29 56.8 GJ 143 = HD 21749
03 41 50.40 -62 46 01.5 HD23472 = HD 23472
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File Summary:
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FileName Lrecl Records Explanations
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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
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Byte-by-byte Description of file: tablea1.dat tablea2.dat
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Bytes Format Units Label Explanations
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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
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Note (1): * = HARPS Doppler measurements taken after the fibre upgrade.
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Acknowledgements:
Trifon Trifonov, trifonov(at)mpia.de
(End) Patricia Vannier [CDS] 24-Jan-2019