J/A+A/689/A235 HD 75898 and HD 11506 radial velocities (Ruggieri+, 2024)
The GAPS Programme at TNG. LVIII. Two multi-planet systems with long-period
sub-stellar companions around metal-rich stars.
Ruggieri A., Desidera S., Sozzetti A., Marzari F., Pinamonti M., Gratton R.,
Biazzo K., D'Orazi V., Malavolta L., Mesa D., Claudi R., Benatti S.,
Bignamini A., Cabona L., Chauvin G., Hagelberg J., Mancini L., Mantovan G.,
Molinaro M., Nardiello D., Scandariato G., Vigan A., Zingales T.
<Astron. Astrophys. 689, A235 (2024)>
=2024A&A...689A.235R 2024A&A...689A.235R (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Optical
Keywords: techniques: radial velocities - planets and satellites: detection -
stars: individual: HD 75898 - stars: individual: HD 11506 -
stars: solar-type
Abstract:
Due to observational biases, a large fraction of known exoplanets are
short-period objects. However, the search for planets began more than
20 years ago, so it is already possible, using a proper data set, to
start exploring a wider range of the parameter space, i.e., that of
long-period planets.
This paper aims to investigate the presence of long-period giant
companions in two systems where one or more planets are already known
and for which a long- term trend in the Radial Velocities (RVs) was
noted in previous works.
Over the last 11 years, we collected 122 spectra of HD 75898 and 72
spectra of HD 11506 with HARPS-N in the framework of the Global
Architecture of Planetary Systems (GAPS) project, from which we
derived precise RV and activity indicators measurements. Additional RV
data from HIRES have also been used to increase the total time span.
For our RV analysis, we used PyORBIT, an advanced Python tool for the
simultaneous Bayesian analysis of RVs and stellar activity indicators.
In addition, we used astrometric (Gaia DR3) and imaging archive data
to complete our analysis. In particular, we combined RVs and
astrometry to better constrain the mass and period of the new
long-period companions. Results. We found evidence for one additional
long-period companion (gas giant planet or brown dwarf) in both
systems considered. The new candidate for HD 75898 has a period of
roughly 18 yr and a true mass of around 8.5MJ. For HD 11506, we
confirm the new object (planet d) announced by Feng et al.
(2022ApJS..262...21F 2022ApJS..262...21F) but we find that the period and true mass are
both almost twice compared to their results (Pd∼72yr, Md∼13MJ).
In addition, for HD 75898, we also found evidence of an activity cycle
affecting RVs with a period one order of magnitude lower compared to
what was previously found in the literature
Description:
We present our high-precision radial velocities and activity
indicators obtained from HARPS-N spectra. There are a total of 122
spectra for HD 75898 and 72 spectra for HD 11506, gathered between
2012 and 2023 with typical exposure times of 900s.
Objects:
--------------------------------------------------------
RA (2000) DE Designation(s)
--------------------------------------------------------
08 53 50.80 +33 03 24.5 HD 75898 = TIC 302580456
01 52 50.53 -19 30 25.1 HD 11506 = TIC 266680498
--------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablee1.dat 40 122 Radial velocities and chromospheric activity
indicator of HD 75898
tablee2.dat 40 72 Radial velocities and chromospheric activity
indicator of HD 11506
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Byte-by-byte Description of file: tablee1.dat tablee2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.1 d BJD Barycentric Julian Date (BJD-2400000)
9- 16 F8.2 m/s RV Radial velocity
18- 22 F5.2 m/s e_RV 1-sigma uncertainty in RV
24- 31 F8.6 --- Sindex Chromospheric activity index S-index
33- 40 F8.6 --- e_Sindex 1-sigma uncertainty in S-index
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Acknowledgements:
Alessandro Ruggieri, alessandro.ruggieri.1(at)phd.unipd.it
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(End) Alessandro Ruggieri [Unipd, Italy], Patricia Vannier [CDS] 19-Apr-2024