J/AJ/160/81 20 years of Beta CVn HIRES/APF radial velocities (Kane+, 2020)
Dynamical packing in the habitable zone: the case of Beta CVn.
Kane S.R., Turnbull M.C., Fulton B.J., Rosenthal L.J., Howard A.W.,
Isaacson H., Marcy G.W., Weiss L.M.
<Astron. J., 160, 81 (2020)>
=2020AJ....160...81K 2020AJ....160...81K
ADC_Keywords: Exoplanets; Stars, G-type; Radial velocities; Optical
Keywords: Astrobiology ; Habitable zone ; Habitable planets ;
Orbital evolution ; Exoplanets ; Exoplanet dynamics
Abstract:
Uncovering the occurrence rate of terrestrial planets within the
habitable zone (HZ) of their host stars has been a particular focus of
exoplanetary science in recent years. The statistics of these
occurrence rates have largely been derived from transiting planet
discoveries, and have uncovered numerous HZ planets in compact systems
around M-dwarf host stars. Here we explore the width of the HZ as a
function of spectral type, and the dynamical constraints on the number
of stable orbits within the HZ for a given star. We show that,
although the Hill radius for a given planetary mass increases with
larger semimajor axis, the width of the HZ for earlier-type stars
allows for more terrestrial planets in the HZ than late-type stars. In
general, dynamical constraints allow ∼6 HZ Earth-mass planets for
stellar masses ≳0.7M☉, depending on the presence of farther out
giant planets. As an example, we consider the case of Beta CVn, a
nearby bright solar-type star. We present 20yr of radial velocities
(RV) from the Keck/High Resolution Echelle Spectrometer (HIRES) and
Automated Planet Finder (APF) instruments and conduct an
injection-recovery analysis of planetary signatures in the data. Our
analysis of these RV data rule out planets more massive than Saturn
within 10 au of the star. These system properties are used to
calculate the potential dynamical packing of terrestrial planets in
the HZ and show that such nearby stellar targets could be particularly
lucrative for HZ planet detection by direct imaging exoplanet
missions.
Description:
We present here 235 precision RV measurements of Beta CVn acquired
over a period of 20yr. Observations were carried out using the High
Resolution Echelle Spectrometer (HIRES) echelle spectrograph on the
Keck I telescope and the Levy spectrometer on the Automated Planet
Finder (APF).
Objects:
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RA (2000) DE Designation(s)
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12 33 44.54 +41 21 26.9 Beta CVn = * bet CVn
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 32 235 Beta CVn Radial Velocities
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See also:
J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)
J/ApJ/694/1085 : Radii of exoplanet host stars (van Belle+, 2009)
J/ApJ/716/1336 : Stability analysis of single-planet (Kopparapu+, 2010)
J/ApJ/723/954 : HIRES radial velocities of GJ 581 (Vogt+, 2010)
J/ApJ/746/101 : Diameters and temperatures of AFG stars (Boyajian+, 2012)
J/A+A/537/A147 : Optimizing exoplanet transit searches (Herrero+, 2012)
J/A+A/556/A126 : GJ667C Doppler & activity measurements (Anglada-Escude+, 2013)
J/A+A/549/A109 : HARPS XXXI. The M-dwarf sample (Bonfils+, 2013)
J/A+A/556/A110 : HARPS radial velocities of GJ 163 (Bonfils+, 2013)
J/ApJ/767/95 : Stellar parameters of smallest KIC stars (Dressing+, 2013)
J/ApJ/770/90 : Candidate planets in the habitable zones (Gaidos, 2013)
J/A+A/552/A78 : Solar like stars radial velocities (Zechmeister+, 2013)
J/ApJ/795/64 : Catalog exoplanet physical parameters (Foreman-Mackey+, 2014)
J/ApJ/807/45 : Potentially habitable planets, M dwarfs (Dressing+, 2015)
J/A+A/618/A115 : HD 147379 radial velocities (Kaminski+, 2018)
J/ApJ/855/75 : 24 years monitoring of Sun and Sun-like stars (Radick+, 2018)
J/AJ/155/48 : California-Kepler Survey. V. Masses and radii (Weiss+, 2018)
J/A+A/627/A49 : Teegarden's Star RV and Hα curves (Zechmeister+, 2019)
J/ApJ/874/L8 : The TESS Habitable Zone Star Catalog (Kaltenegger+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Inst Instrument used (1)
9- 17 F9.4 d BJD [1551/8919] Barycentric Julian Date; BJD-2450000
19- 25 F7.3 m/s RVel [-25.3/242] Radial velocity
27- 32 F6.3 m/s e_RVel [0.91/59] Uncertainty in RVel
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Note (1): Instruments as follows:
APF = Automated Planet Finder (86 occurrences)
HIRES_j = Keck/High Resolution Echelle Spectrometer, data acquired
after the 2004 upgrade to the instrument (137 occurrences)
HIRES_k = Keck/High Resolution Echelle Spectrometer, data acquired
prior to the 2004 upgrade to the instrument (12 occurrences)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 20-Oct-2020