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J/ApJ/814/91  Comparative habitability of transiting exoplanets  (Barnes+, 2015)

Comparative habitability of transiting exoplanets. Barnes R., Meadows V.S., Evans N. <Astrophys. J., 814, 91 (2015)> =2015ApJ...814...91B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Models Keywords: planets and satellites: surfaces Abstract: Exoplanet habitability is traditionally assessed by comparing a planet's semimajor axis to the location of its host star's "habitable zone", the shell around a star for which Earth-like planets can possess liquid surface water. The Kepler space telescope has discovered numerous planet candidates near the habitable zone, and many more are expected from missions such as K2, TESS, and PLATO. These candidates often require significant follow-up observations for validation, so prioritizing planets for habitability from transit data has become an important aspect of the search for life in the universe. We propose a method to compare transiting planets for their potential to support life based on transit data, stellar properties and previously reported limits on planetary emitted flux. For a planet in radiative equilibrium, the emitted flux increases with eccentricity, but decreases with albedo. As these parameters are often unconstrained, there is an "eccentricity-albedo degeneracy" for the habitability of transiting exoplanets. Our method mitigates this degeneracy, includes a penalty for large-radius planets, uses terrestrial mass-radius relationships, and, when available, constraints on eccentricity to compute a number we call the "habitability index for transiting exoplanets" that represents the relative probability that an exoplanet could support liquid surface water. We calculate it for Kepler objects of interest and find that planets that receive between 60% and 90% of the Earth's incident radiation, assuming circular orbits, are most likely to be habitable. Finally, we make predictions for the upcoming TESS and James Webb Space Telescope missions. Description: We consider the entire Kepler sample as of 2015 August 17, from the NASA exoplanet archive, including confirmed and unconfirmed planets, but no false positives. We cut this sample by requiring the equilibrium temperature Teq to lie between 150 and 400K and Rp to be less than 2.5R{earth}. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 160 269 Observed and derived parameters for potentially habitable KOIs
See also: V/133 : Kepler Input Catalog (Kepler Mission Team, 2009) J/ApJS/222/14 : Planetary cand. from 1st yr K2 mission (Vanderburg+, 2016) J/ApJ/809/77 : Transiting Exoplanet Survey Satellite (TESS) (Sullivan+, 2015) J/ApJ/807/45 : Potential habitable planets around M dwarfs (Dressing+, 2015) J/ApJS/210/20 : Small Kepler planets radial velocities (Marcy+, 2014) J/A+A/567/A133 : Habitable zone code (Valle+, 2014) J/ApJ/771/L45 : 3D climate models for exoplanet around M-star (Yang+, 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/ApJS/204/24 : Kepler planetary candidates. III. (Batalha+, 2013) J/A+A/549/A109 : HARPS XXXI. The M-dwarf sample (Bonfils+, 2013) J/ApJ/736/L25 : Habitability of Kepler planetary cand. (Kaltenegger+, 2011) J/ApJ/715/1050 : Predicted abundances for extrasolar planets. I. (Bond+, 2010) : NASA exoplanet archive Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Pl Planet identifier (KNNNNN.NN, K2-3d or Kepler-NNa) 13- 17 F5.3 Rsun R* [0.1/2] Stellar radius 19- 22 I4 K Teff [2661/6640] Effective stellar temperature 24- 28 F5.3 [cm/s2] log(g)* [4/5.3] Log stellar surface gravity 30- 34 F5.3 Msun M* [0.09/1.4] Stellar mass 36- 40 F5.3 Lsun L* [0.001/4.5] Stellar luminosity 42- 48 F7.3 d Per [3.6/651.1] Orbital period 50- 56 F7.1 ppm Depth [52.5/37296] Transit depth 58- 63 F6.3 h Dur [0.8/34.2] Transit duration (D) 65- 69 F5.3 --- b [0/0.97] Impact parameter 71- 74 F4.2 Rgeo Rp [0.5/2.5] Planetary radius 76- 80 F5.2 Mgeo Mp [0.1/28.3] Planetary mass 82- 86 F5.2 [m/s2] log(g)p [4.3/44.4] Log planetary surface gravity 88- 92 F5.1 W/m2 Fmax [270.4/350] Runaway greenhouse flux 94- 99 F6.4 AU a [0.02/1.5] Semi-major axis 101-106 F6.3 h Dc [0.3/20.8] Transit duration if orbit is circular 108-112 F5.3 --- TDA [0.1/4] Transit Duration Anomaly (D/Dc) 114-119 F6.4 --- emin Minimum eccentricity 121-125 F5.3 --- emax Maximum eccentricity 127-132 F6.3 Earth Scir [0.1/21.5] Incident stellar radiation (1) 134-138 F5.3 --- H [0/0.93] "habitability index for transiting exoplanets" (HITE) 140-144 F5.3 --- H' [0/0.96] HITE prime 146-150 F5.2 mag Jmag [9.4/14.7] Apparent J band magnitude 152-156 F5.2 mag Kmag [8.5/17.2] Apparent K band magnitude 158 I1 --- L [0/3]? Flux boundary (2) 160 I1 --- Nc [0/2] Number of adjacent planetary companions
Note (1): If the orbit is circular, in Earth units. Note (2): Limit as follows: 0 = max; 1 = min; 2 = both. 3 = Not explained in the paper (22 sources)
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 24-Feb-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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