J/ApJ/799/180 Radii of 430 KOI Earth- to Neptune-sized planets (Silburt+, 2015)
A statistical reconstruction of the planet population around Kepler
solar-type stars.
Silburt A., Gaidos E., Wu Y.
<Astrophys. J., 799, 180 (2015)>
=2015ApJ...799..180S 2015ApJ...799..180S
ADC_Keywords: Stars, double and multiple ; Stars, diameters ; Planets
Keywords: astrobiology; methods: statistical; planetary systems
Abstract:
Using the cumulative catalog of planets detected by the NASA Kepler
mission, we reconstruct the intrinsic occurrence of Earth- to
Neptune-size (1-4R⊕) planets and their distributions with
radius and orbital period. We analyze 76711 solar-type
(0.8<R*/R☉<1.2) stars with 430 planets on 20-200 day orbits,
excluding close-in planets that may have been affected by the
proximity to the host star. Our analysis considers errors in planet
radii and includes an "iterative simulation" technique that does not
bin the data. We find a radius distribution that peaks at 2-2.8 Earth
radii, with lower numbers of smaller and larger planets. These planets
are uniformly distributed with logarithmic period, and the mean number
of such planets per star is 0.46±0.03. The occurrence is ∼0.66 if
planets interior to 20 days are included. We estimate the occurrence
of Earth-size planets in the "habitable zone" (defined as 1-2
R⊕, 0.99-1.7AU for solar-twin stars) as 6.4-1.1+3.4%. Our
results largely agree with those of Petigura et al.
(2013PNAS..11019273P 2013PNAS..11019273P), although we find a higher occurrence of 2.8-4
Earth-radii planets. The reasons for this excess are the inclusion of
errors in planet radius, updated Huber et al. (2014, J/ApJS/211/2)
stellar parameters, and also the exclusion of planets that may have
been affected by proximity to the host star.
Description:
We construct a stellar sample from the Huber et al. (2014,
J/ApJS/211/2) catalog of 196468 stars observed during the Kepler
mission (Quarters 1-16), selecting "Sun-like" stars with radii
0.8R☉<R*<1.2R☉. We restrict the sample to stars with a
Kepler magnitude Kp<15.5.
Our planet sample is constructed from the 2014 February 26 version of
the KOI catalog (Ramirez et al. 2014AAS...22412010R 2014AAS...22412010R).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 97 430 The "430KOI" planet sample
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/ApJS/217/31 : Kepler planetary candidates. V. 4yr Q1-Q16 (Mullally+, 2015)
J/ApJS/211/2 : Revised properties of Q1-16 Kepler targets (Huber+, 2014)
J/ApJ/779/188 : Spectra of nearby late K and M Kepler stars (Mann+, 2013)
J/ApJ/771/107 : Spectroscopy of faint KOI stars (Everett+, 2013)
J/ApJ/770/90 : Candidate planets in the habitable zones (Gaidos, 2013)
J/ApJ/770/69 : Kepler planet candidates radii (Petigura+, 2013)
J/ApJ/767/95 : Improved parameters of smallest KIC stars (Dressing+, 2013)
J/ApJ/763/41 : Kepler multiple-candidate systems radii (Ciardi+, 2013)
J/A+A/549/A109 : HARPS XXXI. The M-dwarf sample (Bonfils+, 2013)
J/PASP/124/1279 : Q3 Kepler's combined photometry (Christiansen+, 2012)
J/ApJ/753/90 : Parameters of K5 and later type Kepler stars (Mann+, 2012)
J/ApJS/199/30 : Effective temperature scale for KIC stars (Pinsonneault+, 2012)
J/ApJS/197/8 : Kepler's candidate mult. transiting planets (Lissauer+, 2011)
J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)
J/ApJ/738/170 : False positive Kepler planet candidates (Morton+, 2011)
http://exoplanetarchive.ipac.caltech.edu/ : NASA exoplanet archive
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [K0]
3- 9 F7.2 --- KOI [70.03/5482.01] Kepler Object of Interest ID
11- 18 F8.4 d Per [20/200] Period
20- 29 F10.8 --- Rp/R* [0.006/0.07] Planet-to-star radius ratio
31- 38 F8.6 Rsun R* [0.8/1.2] Stellar radius
40- 48 F9.7 Rsun E_R* [0/1.8] Upper uncertainty in R*
50- 58 F9.7 Rsun e_R* [0/0.3] Lower uncertainty in R*
60- 67 F8.6 Rgeo Rp [0.7/6] Planet radius in Earth radii (1)
69- 77 F9.7 Rgeo E_Rp [0/4.9] Upper uncertainty in Rp
79- 88 F10.7 Rgeo e_Rp [0/11.4] Lower uncertainty in Rp
90- 97 F8.4 --- S/N [12/467] Signal-to-noise ratio
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Note (1): The radii of these planets have been updated with
Huber et al. (2014, J/ApJS/211/2) parameters where applicable.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 18-Jun-2015