J/ApJ/736/L25 Habitability of Kepler planetary candidates (Kaltenegger+, 2011)
Exploring the habitable zone for Kepler planetary candidates.
Kaltenegger L., Sasselov D.
<Astrophys. J., 736, L25 (2011)>
=2011ApJ...736L..25K 2011ApJ...736L..25K
ADC_Keywords: Planets ; Effective temperatures ; Stars, diameters
Keywords: astrobiology - atmospheric effects - Earth - methods: data analysis -
planets and satellites: general - stars: individual (Kepler)
Abstract:
This Letter outlines a simple approach to evaluate habitability of
terrestrial planets by assuming different types of planetary
atmospheres and using corresponding model calculations. Our approach
can be applied for current and future candidates provided by the
Kepler mission and other searches. The resulting uncertainties and
changes in the number of planetary candidates in the habitability zone
(HZ) for the Kepler 2011 February data release are discussed. To first
order, the HZ depends on the effective stellar flux distribution in
wavelength and time, the planet albedo, and greenhouse gas effects.
We provide a simple set of parameters which can be used for evaluating
future planet candidates from transit searches.
Description:
The NASA Kepler mission recently announced 1235 planetary candidates.
We use atmospheric models to explore the potential for habitability of
Kepler planetary candidates. Tables 1 and 2 and Figures 2 and 3 show
the temperature as well as the extent of the habitable zone (HZ) for
the Kepler planetary candidates that could potentially be habitable.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 55 21 Characteristics of the potentially rocky habitable
Kepler planetary candidates (KOI, Rpl, Period,
Teff, Rstar, Teq) for 0%, 50%, and 100% clouds
table2.dat 74 76 The two inner limits and outer limit of the HZ
for Kepler planetary candidates in the HZ of
their stars for a 0%, 50% and 100% clouds
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)
J/ApJ/736/19 : Kepler planetary candidates. II. (Borucki+, 2011)
J/ApJ/728/117 : Kepler planetary candidates. I. (Borucki+, 2011)
J/ApJS/197/8 : Kepler's candidate multiple transiting planets (Lissauer+,
2011)
J/A+A/536/L9 : Detections of transit variations in KOI 806 (Tingley+, 2011)
J/ApJ/716/1336 : Stability analysis of single-planet (Kopparapu+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 --- KOI [70.03/1591.01] Kepler identification number
9- 11 F3.1 Rgeo Rpl [0.9/2] Planetary candidate radius; Earth radii
13- 17 F5.3 AU a [0.05/0.46] Planetary candidate orbital distance
19- 22 I4 K Teff [3240/5801] Stellar effective temperature
24- 27 F4.2 Rsun Rstar [0.27/0.9] Stellar radius
29- 31 I3 K T.Kp [243/454] Kepler equilibrium temperature (Teq)
33- 35 I3 K T.WL0 [256/471] Teq for water loss and 0% clouds
37- 39 I3 K T.WL50 Teq for water loss and 50% clouds
41- 43 I3 K T.WL100 Teq for water loss and 100% clouds
45- 47 I3 K T.R0 Teq for runaway greenhouse conditions
and 0% clouds
49- 51 I3 K T.R50 Teq for runaway greenhouse conditions
and 50% clouds
53- 55 I3 K T.R100 Teq for runaway greenhouse conditions
and 100% clouds
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 --- KOI [51.01/1596.02] Kepler identification number (1)
9- 13 F5.1 --- Rpl [0.9/204.8] Planetary candidate radius; Earth radii
15- 19 F5.3 AU a [0.05/2.235] Planetary candidate orbital distance
21- 24 I4 K Teff [1644/6293] Stellar effective temperature
26- 29 F4.2 Rsun Rstar [0.27/6.16] Stellar radius
31- 34 F4.2 AU HZia0 Inner HZ limit for H20 loss and 0% clouds
36- 39 F4.2 AU HZib0 Inner HZ limit for greenhouse onset and 0% clouds
41- 44 F4.2 AU HZo0 [0.17/3.91] Outer HZ limit for 0% clouds
46- 49 F4.2 AU HZia50 Inner HZ limit for H20 loss and 50% clouds
51- 54 F4.2 AU HZib50 Inner HZ limit for greenhouse onset and 50% clouds
56- 59 F4.2 AU HZo50 [0.19/4.52] Outer HZ limit for 50% clouds
61- 64 F4.2 AU HZia100 Inner HZ limit for H20 loss and 100% clouds
66- 69 F4.2 AU HZib100 Inner HZ limit for greenhouse onset and 100% clouds
71- 74 F4.2 AU HZo100 [0.23/5.49] Outer HZ limit for 100% clouds
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Note (1): Sorted by Teq.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 04-Jan-2013