J/A+A/635/A6 HD 219134 light and RV curves and code (Bonfanti+, 2020)
MCMCI: a code to fully characterize an exoplanetary system.
Bonfanti A., Gillon M.
<Astron. Astrophys. 635, A6 (2020)>
=2020A&A...635A...6B 2020A&A...635A...6B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry ;
Radial velocities ; Models, evolutionary
Keywords: planets and satellites: fundamental parameters -
stars: fundamental parameters
Abstract:
By analysing the transit light-curve of a planet-hosting star or the
induced radial velocity oscillations, many useful information on the
planet may be retrieved. However, inferring the physical parameters of
the planet (mass, size, semi-major axis, etc.) requires the
preliminary knowledge of some parameters of the host star, especially
its mass and/or radius, that are generally inferred through
theoretical evolutionary models.
The paper aims at presenting and testing a whole algorithm devoted to
the complete characterization of an exoplanetary system thanks to the
global analysis of photometric and/or radial velocity time-series
combined to observational stellar parameters derived either from
spectroscopy or photometry.
We developed an integrated tool called MCMCI that combines the Markov
Chain Monte Carlo (MCMC) approach for analysing photometric and/or
radial velocity time-series with a proper interpolation within stellar
evolutionary isochrones and tracks (known as Isochrone placement) to
be performed at each chain step, to retrieve stellar theoretical
parameters, such as age, mass and radius.
We tested the MCMCI both on the HD 219134 multiplanetary system
hosting two transiting rocky super-Earths and on WASP-4, that hosts a
bloated hot Jupiter. Even considering different input approaches, a
final convergence was reached within the code, we found good agreement
with the results already stated in the literature and we obtained more
precise output parameters, especially concerning planetary masses.
The MCMCI tool offers the opportunity of performing an integrated
analysis of an exoplanetary system, without splitting it into the
preliminary stellar characterization through theoretical models, but
rather favouring a close interaction between the light-curve analysis
and the isochrones, so that the parameters recovered at each step of
the MCMC enter as input of the Isochrone placement.
Description:
4 light-curves of HD 219134 observed with the Spitzer/IRAC detector.
1 RV timeseries of HD 219134 gathered by the HARPS-N spectrograph.
Objects:
-------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------
23 13 16.97 +57 10 06.1 HD 219134 = HR 8832
-------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
phot1.dat 281 1044 Light-curve No. 1 due to the HD 219134 b transit
phot2.dat 281 680 Light-curve No. 2 due to the HD 219134 b transit
phot3.dat 281 799 Light-curve No. 3 due to the HD 219134 c transit
phot4.dat 281 799 Light-curve No. 4 due to the HD 219134 c transit
rv1.dat 78 663 Radial velocity time-series of HD 219134
code.zip 512 9152 MCMCI code files
--------------------------------------------------------------------------------
See also:
J/ApJ/821/74 : 27yr of RV observations of HD 219134 (Johnson+, 2016)
Byte-by-byte Description of file: phot1.dat phot2.dat phot3.dat phot4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
4- 21 F18.13 d BJD Barycentric Julian Date (UTC) (BJD-2450000)
29- 47 F19.17 --- Flux Normalized flux
56- 78 E23.16 --- e_Flux Error on normalized flux
80- 99 F20.17 pix xpos x location
107-125 F19.17 pix ypos y location
134-151 F18.16 pix FWHM PSF's FHWM
160-177 F18.16 pix FWHMx PSF's FWHM along the x-direction
186-203 F18.16 pix FWHMy PSF's FWHM along the y-direction
212-229 F18.16 e Sky Sky
238-255 F18.16 --- Airmass Airmass
264-281 F18.15 s Texp Exposure time
--------------------------------------------------------------------------------
Byte-by-byte Description of file: rv1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.6 d BJD Barycentric Julian Date (UTC) (BJD-2450000)
15- 23 F9.5 km/s RV Radial velocity
27- 33 F7.5 km/s e_RV Error on Radial velocity
37- 43 F7.5 km/s FWHM FWHM of the CCF
47- 52 F6.3 % Contrast CCF's contrast
56- 62 F7.5 km/s Bisector Bisector velocity span
66- 72 F7.4 [-] logR'HK logR'HK
76- 78 I3 s Texp Exposure time
--------------------------------------------------------------------------------
Acknowledgements:
Andrea Bonfanti, a.bonfanti(at)uliege.be
(End) Andrea Bonfanti [ULg, Belgium], Patricia Vannier [CDS] 08-Jan-2020