J/A+A/639/A50 HD 164922 d HARPS-N time series (Benatti+, 2020)
The GAPS Programme at TNG.
XXIII. HD 164922 d: a close-in super-Earth discovered with HARPS-N in a system
with a long-period Saturn mass companion.
Benatti S., Damasso M., Desidera S., Marzari F., Biazzo K., Claudi R.,
Di Mauro M.P., Lanza A.F., Pinamonti M., Barbato D., Malavolta L.,
Poretti E., Sozzetti A., Affer L., Bignamini A., Bonomo A.S., Borsa F.,
Brogi M., Bruno G., Carleo I., Cosentino R., Covino E., Frustagli G.,
Giacobbe P., Gonzalez M., Gratton R., Harutyunyan A., Knapic C., Leto G.,
Lodi M., Maggio A., Maldonado J., Mancini L., Martinez Fiorenzano A.,
Micela G., Molinari E., Molinaro M., Nardiello D., Nascimbeni V.,
Pagano I., Pedani M., Piotto G., Rainer M., Scandariato G.
<Astron. Astrophys. 639, A50 (2020)>
=2020A&A...639A..50B 2020A&A...639A..50B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Spectroscopy
Keywords: planets and satellites: detection - planetary systems -
stars: individual: HD 164922 - techniques: radial velocities -
Abstract:
Observations of exoplanetary systems show that a wide variety of
architectures are possible. Determining the rate of occurrence of
Solar System analogs - with inner terrestrial planets and outer gas
giants - is still an open question.
In the framework of the Global Architecture of Planetary Systems
(GAPS) project we collected more than 300 spectra with HARPS-N at the
Telescopio Nazionale Galileo for the bright G9V star HD164922. This
target is known to host one gas giant planet in a wide orbit
(Pb∼1200-days, semi-major axis ∼2au) and a Neptune-mass planet with a
period Pc∼76-days. Our aim was to investigate the presence of
additional low-mass companions in the inner region of the system.
We compared the radial velocities (RV) and the activity indices
derived from the HARPS-N time series to measure the rotation period of
the star and used a Gaussian process regression to describe the
behaviour of the stellar activity.We exploited this information in a
combined model of planetary and stellar activity signals in an RV
time-series composed of almost 700 high-precision RVs, both from
HARPS-N and literature data. We performed a dynamical analysis to
evaluate the stability of the system and the allowed regions for
additional potential companions. We performed experiments of injection
and recovery of additional planetary signals to gauge the sensitivity
thresholds in minimum mass and orbital separation imposed by our data.
Thanks to the high sensitivity of the HARPS-N dataset, we detect an
additional inner super-Earth with an RV semi-amplitude of 1.3±0.2m/s
and a minimum mass of mdsini=4±/1M⊕. It orbits HD164922
with a period of 12.4580.003 days. We disentangle the planetary signal
from activity and measure a stellar rotation period of ∼42 days. The
dynamical analysis shows the long term stability of the orbits of the
three-planet system and allows us to identify the permitted regions
for additional planets in the semi-major axis ranges 0.18-0.21au and
0.6-1.4au. The latter partially includes the habitable zone of the
system. We did not detect any planet in these regions, down to minimum
detectable masses of 5 and 18M⊕, respectively. A larger region
of allowed planets is expected beyond the orbit of planet b, where our
sampling rules-out bodies with minimum mass >50MM_⊕. The planetary
orbital parameters and the location of the snow line suggest that this
system has been shaped by a gas disk migration process that halted
after its dissipation.
Description:
Time series of the HARPS-N spectra for the target HD 164922, collected
within the GAPS collaboration, from March 2013 to October 2017, with
an additional set of 10 spectra collected between May and June 2018.
Columns: BJD_TDB - 2450000, radial velocity (RV in km/s), log R'HK,
bisector span (BIS, in km/s), DeltaV, Vasy(mod) and Halpha indices
with the corresponding uncertainties.
Objects:
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RA (2000) DE Designation(s)
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18 02 30.86 +26 18 46.8 HD 164922 = HIP 88348
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 111 314 Time series of HD 164922
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD Barycentric Julian day (TDB), BJD-24500000.0
14- 20 F7.4 km/s RV Radial velocity
23- 28 F6.4 km/s e_RV Radial velocity error
31- 37 F7.4 --- logR'HK logR'HK index
40- 45 F6.4 --- e_logR'HK logR'HK index error
47- 54 F8.4 m/s BIS Bisector span
57- 62 F6.4 m/s e_BIS Bisector span error
65- 71 F7.4 --- DeltaV DeltaV CCF asymmetry index
74- 79 F6.4 --- e_DeltaV DeltaV CCF asymmetry index error
82- 87 F6.4 --- Vasy(mod) Vasy(mod) CCF asymmetry index
90- 95 F6.4 --- e_Vasy(mod) Vasy(mod) CCF asymmetry index error
98-103 F6.4 --- Halpha Hα index
106-111 F6.4 --- e_Halpha Hα index error
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Acknowledgements:
Serena Benatti, serena.benatti(at)inaf.it
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(End) Serena Benatti [INAF, Palermo], Patricia Vannier [CDS] 10-May-2020