J/ApJ/770/90 Candidate planets in the habitable zones (Gaidos, 2013)
Candidate planets in the habitable zones of Kepler stars.
Gaidos E.
<Astrophys. J., 770, 90 (2013)>
=2013ApJ...770...90G 2013ApJ...770...90G
ADC_Keywords: Planets ; Stars, double and multiple ; Stars, masses ;
Stars, ages ; Abundances, [Fe/H]
Keywords: astrobiology; methods: statistical; planetary systems;
stars: fundamental parameters; stars: statistics;
techniques: photometric
Abstract:
A key goal of the Kepler mission is the discovery of Earth-size
transiting planets in "habitable zones" where stellar irradiance
maintains a temperate climate on an Earth-like planet. Robust
estimates of planet radius and irradiance require accurate stellar
parameters, but most Kepler systems are faint, making spectroscopy
difficult and prioritization of targets desirable. The parameters of
2035 host stars were estimated by Bayesian analysis and the
probabilities pHZ that 2738 candidate or confirmed planets orbit in
the habitable zone were calculated. Dartmouth Stellar Evolution
Program models were compared to photometry from the Kepler Input
Catalog, priors for stellar mass, age, metallicity and distance, and
planet transit duration. The analysis yielded probability density
functions for calculating confidence intervals of planet radius and
stellar irradiance, as well as pHZ. Sixty-two planets have pHZ>0.5
and a most probable stellar irradiance within habitable zone limits.
Fourteen of these have radii less than twice the Earth; the objects
most resembling Earth in terms of radius and irradiance are KOIs
2626.01 and 3010.01, which orbit late K/M-type dwarf stars. The
fraction of Kepler dwarf stars with Earth-size planets in the
habitable zone (η⊕) is 0.46, with a 95% confidence
interval of 0.31-0.64. Parallaxes from the Gaia mission will reduce
uncertainties by more than a factor of five and permit definitive
assignments of transiting planets to the habitable zones of Kepler
stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 132 72 Candidate planets in the habitable zones of
Kepler stars (64 with pHZ>50%)
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
V/136 : Teff and metallicities for Tycho-2 stars (Ammons+, 2006)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/A+A/567/A133 : Habitable zone code (Valle+, 2014)
J/ApJ/770/69 : Kepler planet candidates radii (Petigura+, 2013)
J/ApJ/770/43 : Spectroscopic [Fe/H] of Kepler planet hosts (Mann+, 2013)
J/ApJ/767/95 : Improved param. of smallest KIC stars (Dressing+, 2013)
J/AJ/145/102 : Bright M dwarfs spectro. in the northern sky (Lepine+, 2013)
J/ApJS/204/24 : Kepler planetary candidates. III. (Batalha+, 2013)
J/A+A/549/A109 : HARPS XXXI. The M-dwarf sample (Bonfils+, 2013)
J/AJ/144/24 : The Kepler-INT survey (Greiss+, 2012)
J/ApJ/757/112 : Stellar diameters. II. K and M-stars (Boyajian+, 2012)
J/ApJ/756/186 : TTVs from Kepler. VI. Statistical tests (Steffen+, 2012)
J/ApJ/753/90 : Stellar param. of K5 & later type Kepler stars (Mann+, 2012)
J/ApJ/750/L37 : Stellar parameters of low-mass KOIs (Muirhead+, 2012)
J/ApJS/199/30 : KIC stars effective temperature scale (Pinsonneault+, 2012)
J/MNRAS/423/122 : Abundances of 93 solar-type Kepler targets (Bruntt+, 2012)
J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)
J/MNRAS/411/435 : Stellar parameters and extinction (Bailer-Jones, 2011)
J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)
J/ApJ/736/19 : Kepler planetary candidates. II. (Borucki+, 2011)
J/ApJ/736/L25 : Habitability of Kepler planetary cand. (Kaltenegger+, 2011)
J/ApJ/649/1010 : Habitability of known exoplanetary systems (Jones+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- f_KOI [o] "o" for other HZ candidates (pHZ<0.5) (1)
3- 9 F7.2 --- KOI [87.01/3086.01] KOI planet candidate ID
11- 18 I8 --- KIC [2973386/12417486] KIC star number
20- 23 F4.2 --- pHZ [0.03/1] Habitable Zone probability
25- 29 F5.1 d Per [14.9/574] Orbital period
31- 34 F4.2 --- Ir [0.2/3.3] Most probable value of Irradiance;
in I⊕ unit
36- 39 F4.2 --- b_Ir [0.1/2] 95% lower limit on Ir
41- 45 F5.2 --- B_Ir [0.2/25] 95% upper limit on Ir
47- 51 F5.2 Rgeo Rp [1/11.5] Most probable planet radius
53- 57 F5.2 Rgeo b_Rp [0.8/11] 95% lower limit on Rp
59- 63 F5.2 Rgeo B_Rp [1/27] 95% upper limit on Rp
65- 68 I4 K Teff [3542/6244] Star effective temperature
70- 73 F4.2 [cm/s2] logg [4.2/5] Star surface gravity
75- 78 F4.1 [Sun] [Fe/H] [-0.5/0.2] Star metallicity
80- 83 F4.2 [Lsun] L* [0.01/2.1] Log of stellar luminosity
85- 88 F4.2 Msun M* [0.3/1.2] Stellar mass
90- 92 F3.1 Gyr Age [1/8.6] Stellar age
94-100 A7 --- --- [Kepler-]
101-103 A3 --- Kepler Planet Kepler name
105-132 A28 --- Ref Reference(s) (2)
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Note (1): o = Other planets with Rp<2R⊕ and pHZ>0.01
Note (2): Reported as HZ candidate in reference as follows:
Bo11 = Borucki et al. (2011, Cat. J/ApJ/736/19)
KS11 = Kaltenegger & Sasselov (2011, Cat. J/ApJ/736/L25)
Ba13 = Batalha et al. (2013, Cat. J/ApJS/204/24)
DC13 = Dressing & Charbonneau (2013, Cat. J/ApJ/767/95).
Spectroscopy reported in reference as follows:
Bu12 = Buchhave et al. (2012, Cat. J/other/Nat/486.375)
Mu12 = Muirhead et al. (2012, Cat. J/ApJ/750/L37)
Ma13 = A. W. Mann et al. 2013, Cat. J/ApJ/770/43
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 09-Jan-2015