J/AJ/154/109 California-Kepler Survey (CKS). III. Planet radii (Fulton+, 2017)
The California-Kepler Survey. III. A gap in the radius distribution of small
planets.
Fulton B.J., Petigura E.A., Howard A.W., Isaacson H., Marcy G.W.,
Cargile P.A., Hebb L., Weiss L.M., Johnson J.A., Morton T.D., Sinukoff E.,
Crossfield I.J.M., Hirsch L.A.
<Astron. J., 154, 109-109 (2017)>
=2017AJ....154..109F 2017AJ....154..109F (SIMBAD/NED BibCode)
ADC_Keywords: Planets
Keywords: planetary systems
Abstract:
The size of a planet is an observable property directly connected to
the physics of its formation and evolution. We used precise radius
measurements from the California-Kepler Survey to study the size
distribution of 2025 Kepler planets in fine detail. We detect a factor
of ≥2 deficit in the occurrence rate distribution at
1.5-2.0R⊕. This gap splits the population of close-in
(P<100days) small planets into two size regimes: RP<1.5R⊕
and RP=2.0--3.0R⊕, with few planets in between. Planets in
these two regimes have nearly the same intrinsic frequency based on
occurrence measurements that account for planet detection
efficiencies. The paucity of planets between 1.5 and 2.0R⊕
supports the emerging picture that close-in planets smaller than
Neptune are composed of rocky cores measuring 1.5R⊕ or smaller
with varying amounts of low-density gas that determine their total
sizes.
Description:
We adopt the stellar sample and the measured stellar parameters from
the California-Kepler Survey (CKS) program (Petigura et al. 2017, Cat.
J/AJ/154/107; Paper I). The measured values of Teff, logg, and
[Fe/H] are based on a detailed spectroscopic characterization of
Kepler Object of Interest (KOI) host stars using observations from
Keck/HIRES. In Johnson et al. 2017 (Cat J/AJ/154/108; Paper II), we
associated those stellar parameters from Paper I to Dartmouth
isochrones (Dotter et al. 2008ApJS..178...89D 2008ApJS..178...89D) to derive improved
stellar radii and masses, allowing us to recalculate planetary radii
using the light-curve parameters from Mullally et al. 2015 (Cat.
J/ApJS/217/31).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 84 900 *Planet detection statistics
--------------------------------------------------------------------------------
Note on table2.dat: Refer to Paper II (Johnson et al. 2017, Cat. J/AJ/154/108)
for the California-Kepler Survey (CKS) stellar parameters associated with each
Kepler Object of Interest (KOI). This table contains only the subset of planet
detections that passed the filters described in Section 2.2. The full sample of
planet candidates orbiting CKS target stars can be found in Paper II.
--------------------------------------------------------------------------------
See also:
J/AJ/154/107 : California-Kepler Survey (CKS). I. (Petigura+, 2017)
J/AJ/154/108 : California-Kepler Survey (CKS). II. (Johnson+, 2017)
J/ApJS/217/31 : Kepler planetary candidates. VI. 4yr Q1-Q16 (Mullally+, 2015)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- --- [K]
2- 9 F08.2 --- KOI Kepler Object Identifier (KOI) of the
candidate planet
11- 21 F11.8 d Per Kepler candidate orbital period
23- 29 E7.1 d E_Per Upper uncertainty in Per
31- 37 E7.1 d e_Per Lower uncertainty in Per
39- 43 F5.2 Rgeo Rad Candidate planet radius (Rp)
45- 48 F4.2 Rgeo E_Rad Upper uncertainty in Rad
50- 53 F4.2 Rgeo e_Rad Lower uncertainty in Rad
55- 61 F7.2 --- S/N Transit signal-to-noise ratio (mi)
63- 67 F5.3 --- DProb Detection probability (Pdet)
69- 74 F6.4 --- TProb Transit probability
76- 84 F9.2 --- Weight Mean total search completeness (1/wi)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Petigura et al., Paper I 2017AJ....154..107P 2017AJ....154..107P, Cat. J/AJ/154/107
Johnson et al., Paper II 2017AJ....154..108J 2017AJ....154..108J, Cat. J/AJ/154/108
Petigura et al., Paper IV 2018AJ....155...89P 2018AJ....155...89P, Cat. J/AJ/155/89
Weiss et al., Paper V 2018AJ....155...48W 2018AJ....155...48W, Cat. J/AJ/155/48
Weiss et al., Paper VI 2018AJ....156..254W 2018AJ....156..254W
Fulton & Petigura., Paper VII 2018AJ....156..264F 2018AJ....156..264F
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 21-Dec-2017