J/AJ/165/252 HIRES radial velocity follow up of HD 17156 (Kane+, 2023)
Revised Properties and Dynamical History for the HD 17156 System.
Kane S.R., Hill M.L., Dalba P.A., Fetherolf T., Henry G.W.,
Fajardo-Acosta S.B., Gnilka C.L., Howard A.W., Howell S.B., Isaacson H.
<Astron. J., 165, 252 (2023)>
=2023AJ....165..252K 2023AJ....165..252K
ADC_Keywords: Exoplanets; Stars, high-velocity; Spectra, optical;
Radial velocities
Keywords: Exoplanet astronomy ; Exoplanet dynamics ; Exoplanet detection
methods ; Exoplanet systems ; Exoplanets ; Radial velocity ;
Photometry
Abstract:
From the thousands of known exoplanets, those that transit bright host
stars provide the greatest accessibility toward detailed system
characterization. The first known such planets were generally
discovered using the radial velocity technique, then later found to
transit. HD17156b is particularly notable among these initial
discoveries because it diverged from the typical hot-Jupiter
population, occupying a 21.2day eccentric (e=0.68) orbit, offering
preliminary insights into the evolution of planets in extreme orbits.
Here we present new data for this system, including ground- and
space-based photometry, radial velocities, and speckle imaging, that
further constrain the system properties and stellar/planetary
multiplicity. These data include photometry from the Transiting
Exoplanet Survey Satellite that cover five transits of the known
planet. We show that the system does not harbor any additional giant
planets interior to 10au. The lack of stellar companions and the age
of the system indicate that the eccentricity of the known planet may
have resulted from a previous planet-planet scattering event. We
provide the results from dynamical simulations that suggest possible
properties of an additional planet that culminated in ejection from
the system, leaving a legacy of the observed high eccentricity for
HD17156b.
Description:
HD17156 has been observed using the High Resolution Echelle
Spectrometer (HIRES) on the 10m Keck I telescope since early 2006. In
total, 71 radial velocity measurements are included in our full data
set that span a period of ∼17yr, with a median uncertainty of
1.415m/s.
Objects:
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RA (2000) DE Designation(s) (Period)
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02 49 44.48 +71 45 11.6 HD 17156 = 2MASS J02494447+7145115 (21.2d)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 29 71 HD 17156 radial velocities
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See also:
J/A+A/375/L27 : HD80606b, planet on an extremely elongated orbit (Naef+ 2001)
J/A+A/485/871 : Transiting planet HD 17156b (Gillon+, 2008)
J/A+A/503/601 : HD17156 transit photometry & radial velocity (Barbieri+, 2009)
J/ApJ/693/794 : Transit of exoplanet HD 17156b (Winn+, 2009)
J/AJ/142/19 : Speckle observations of KOI (Howell+, 2011)
J/ApJ/754/37 : HD 192263 radial velocities and photometry (Dragomir+, 2012)
J/ApJ/844/102 : KIC star parallaxes from asteroseismology/Gaia (Huber+, 2017)
J/A+A/605/A72 : Planetary systems AMD-stability (Laskar+, 2017)
J/A+A/614/A138 : HD 80606/80607 equivalent widths (Lui+, 2018)
J/AJ/160/129 : HARPS, HIRES and AAT Radial Velocities HD136352 (Kane+, 2020)
J/ApJS/259/62 : TESS transit timing of hot Jupiters (Ivshina+, 2022)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD [2453746/2459858] Barycentric Julian Date
16- 23 F8.3 m/s RVel [-365/168] Radial velocity
25- 29 F5.3 m/s e_RVel [1/2] Uncertainty in RVel
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 05-Oct-2023