J/ApJ/774/L12 Kepler multiplanet systems analysis (Q1-Q8) (Steffen+, 2013)
A lack of short-period multiplanet systems with close-proximity pairs and the
curious case of Kepler-42.
Steffen J.H., Farr W.M.
<Astrophys. J., 774, L12 (2013)>
=2013ApJ...774L..12S 2013ApJ...774L..12S
ADC_Keywords: Stars, double and multiple ; Planets ; Effective temperatures ;
Stars, diameters ; Stars, distances
Keywords: celestial mechanics; methods: data analysis; methods: statistical;
planets and satellites: formation
Abstract:
Many Kepler multiplanet systems have planet pairs near low-order,
mean-motion resonances. In addition, many Kepler multiplanet systems
have planets with orbital periods less than a few days. With the
exception of Kepler-42, however, there are no examples of systems with
both short orbital periods and nearby companion planets while our
statistical analysis predicts ∼17 such pairs. For orbital periods of
the inner planet that are less than three days, the minimum period
ratio of adjacent planet pairs follows the rough constraint
P=P2/P1≳2.3(P1/day)-2/3 (equation (1)). This absence is not
due to a lack of planets with short orbital periods. We also show a
statistically significant excess of small, single-candidate systems
with orbital periods below three days over the number of multiple
candidate systems with similar periods--perhaps a small-planet
counterpart to the hot Jupiters.
Description:
All data used for our analysis come from the NASA Exoplanet Archive
catalog of Kepler Objects of Interest (KOIs) retrieved on 2013 June 3.
We display results in our figures using primarily the KOI catalog from
Quarter 1 through Quarter 8 (Q1-Q8).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 65 468 *List of some system properties of the KOIs shown
in the figures
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Note on table1.dat : Stellar information from the NASA Exoplanet Archive (Q8)
for each system sorted by the minimum distance of any planet pair from the
line given in Equation (1) (measured perpendicular to that line).
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/ApJ/784/45 : Kepler's multiple planet candidates. III. (Rowe+, 2014)
J/ApJS/204/24 : Kepler planetary candidates. III. (Batalha+, 2013)
J/ApJ/763/41 : Kepler multiple-candidate systems radii (Ciardi+, 2013)
J/ApJ/750/113 : Kepler TTVs. II. Confirmed multiplanet systems (Ford+, 2012)
J/ApJS/197/8 : Kepler's candidate mult. transiting planets (Lissauer+, 2011)
J/ApJS/197/2 : Transit timing observations from Kepler. I. (Ford+, 2011)
J/ApJ/693/1084 : Ten new and updated multiplanet systems (Wright+, 2009)
http://exoplanetarchive.ipac.caltech.edu/ : NASA exoplanet archive
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC Kepler Input Catalog (V/133) identifier
10 A1 --- --- [K]
11- 15 I5 --- KOI Kepler object of interest
17- 20 I4 K Teff [3240/8002] Effective temperature
22- 26 F5.3 [cm/s2] log(g) [3.5/4.9] Log of the surface gravity
28- 32 F5.3 Rsun R* [0.2/3.2] Stellar radius
34- 39 F6.3 mag Kpmag [9.2/17.5] Kepler magnitude
41- 52 F12.8 d Pmin [0.4/200.7] Minimum period
54- 65 F12.9 [-] logD [-0.2/1.8] Log of projected distance of any
planet pair from the line in Eq.(1)
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Note (1): the line in the (logP1,logP2) diagram in Fig.1 represents the
boundary above which there are examples of planet pairs:
P2/P1 = 2.3(P1/day)-2/3
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Mar-2015