J/A+A/599/A90 Characterization of HD 108874 system (Benatti+, 2017)
The GAPS Programme with HARPS-N at TNG.
XII: Characterization of the planetary system around HD 108874.
Benatti S., Desidera S., Damasso M., Malavolta L., Lanza A.F., Biazzo K.,
Bonomo A.S., Claudi R.U., Marzari F., Poretti E., Gratton R., Micela G.,
Pagano I., Piotto G., Sozzetti A., Boccato C., Cosentino R., Covino E.,
Maggio A., Molinari E., Smareglia R., Affer L., Andreuzzi G., Bignamini A.,
Borsa F., di Fabrizio L., Esposito M., Martinez Fiorenzano A., Messina S.,
Giacobbe P., Harutyunyan A., Knapic C., Maldonado J., Masiero S.,
Nascimbeni V., Pedani M., Rainer M., Scandariato G., Silvotti R.
<Astron. Astrophys. 599, A90 (2017)>
=2017A&A...599A..90B 2017A&A...599A..90B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities
Keywords: stars: individual: HD 108874 - techniques: radial velocities -
stars: activity - planetary systems
Abstract:
In order to understand the observed physical and orbital diversity of
extrasolar planetary systems, a full investigation of these objects
and of their host stars is necessary. Within this field, one of the
main purposes of the GAPS observing project with HARPS-N@TNG is to
provide a more detailed characterisation of already known systems. In
this framework we monitored the star, hosting two giant planets,
HD108874, with HARPS-N for three years in order to refine the orbits,
to improve the dynamical study and to search for additional low-mass
planets in close orbits. We subtracted the radial velocity (RV) signal
due to the known outer planets, finding a clear modulation of 40.2d
period. We analysed the correlation between RV residuals and the
activity indicators and modelled the magnetic activity with a
dedicated code. Our analysis suggests that the 40.2d periodicity is a
signature of the rotation period of the star. A refined orbital
solution is provided, revealing that the system is close to a mean
motion resonance of about 9:2, in a stable configuration over 1Gyr.
Stable orbits for low-mass planets are limited to regions very close
to the star or far from it. Our data exclude super-Earths with
Msini≳5M{earth} within 0.4AU and objects with Msini≳2M{earth}
with orbital periods of a few days. Finally we put constraints on the
habitable zone of the system, assuming the presence of an exomoon
orbiting the inner giant planet.
Description:
This table includes the time series of the radial velocity, the
bisector span and the chromospheric activity indices LogR'HK and
Halpha of the new HARPS-N spectra collected in the framework of the
GAPS Project for the target HD 108874, analysed in the paper.
The corresponding uncertainties are provided as well.
Objects:
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RA (2000) DE Designation(s)
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12 30 26.88 +22 52 47.4 HD 108874 = HIP 61028
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 71 91 Time series of the HARPS-N spectra for HD 108874
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See also:
J/A+A/554/A28 : Qatar-1 differential light curve (Covino+, 2013)
J/A+A/575/A111 : GAPS V: Global analysis of the XO-2 system (Damasso+, 2015)
J/A+A/575/L15 : TrES-4b RV and Ic curves (Sozzetti+, 2015)
J/A+A/578/A64 : Velocity curve of τ Boo A (Borsa+, 2015)
J/A+A/579/A136 : HAT-P-36 and WASP-11/HAT-P-10 light curves (Mancini+, 2015)
J/A+A/583/A135 : XO-2N and XO-2S spectra (Biazzo+, 2015)
J/A+A/588/A118 : Pr0211 RVs, photometry and activity indexes (Malavolta+, 2016)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD Barycentric Julian Date (UTC) (BJD-2450000)
13- 20 F8.4 km/s RV Radial Velocity
22- 27 F6.4 km/s e_RV Error on the Radial Velocity
29- 35 F7.4 km/s BVS Bisector Velocity Span
37- 42 F6.4 km/s e_BVS Error on the Bisector Velocity Span
44- 50 F7.4 --- logR'HK Activity index of the H&K lines of the CaII
52- 57 F6.4 --- e_logR'HK Error on the logR'HK
59- 64 F6.4 --- Halpha Activity index of the Halpha line
66- 71 F6.4 --- e_Halpha Error on the Halpha
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Acknowledgements:
Serena Benatti, serena.benatti(at)oapd.inaf.it
References:
Covino et al., Paper I 2013A&A...554A..28C 2013A&A...554A..28C, Cat. J/A+A/554/A28
Desidera et al., Paper II 2013A&A...554A..29D 2013A&A...554A..29D
Esposito et al., Paper III 2014A&A...564L..13E 2014A&A...564L..13E
Desidera et al., Paper IV 2014A&A...567L...6D 2014A&A...567L...6D
Damasso et al., Paper V 2015A&A...575A.111D 2015A&A...575A.111D, Cat. J/A+A/575/A111
Sozzetti et al., Paper VI 2015A&A...575L..15S 2015A&A...575L..15S, Cat. J/A+A/575/L15
Borsa et al., Paper VII 2015A&A...578A..64B 2015A&A...578A..64B, Cat. J/A+A/578/A64
Mancini et al., Paper VIII 2015A&A...579A.136M 2015A&A...579A.136M, Cat. J/A+A/579/A136
Damasso et al., Paper IX 2015A&A...581L...6D 2015A&A...581L...6D, Cat. J/A+A/581/L6
Biazzo et al., Paper X 2015A&A...583A.135B 2015A&A...583A.135B, Cat. J/A+A/583/A135
Malavolta et al., Paper XI 2016A&A...588A.118M 2016A&A...588A.118M, Cat. J/A+A/588/A118
(End) S. Benatti [INAF - Astron. Obs. of Padova], P. Vannier [CDS] 16-Dec-2016