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Data Comparison of Confirmed Exoplanets with Kepler Candidates

posted Oct 29, 2011, 6:14 AM by Abel Mendez   [ updated Oct 29, 2011, 6:22 AM ]
Here we show a simple statistical comparison of data for confirmed exoplanets (exoplanet.eu) and Kepler candidates (Borucki et al., 2011). This analysis was done as a quality test of the data from both sources for the Habitable Exoplanets Catalog (HEC). In this process we identified missing data and corrected a few errors in both datasets. Figure 1 shows histograms for each compared planetary parameter and Table 1 shows more details, including stellar properties. Kepler candidates were corrected as described by Muirhead et al. (2011). A discussions about this comparison will be addressed in the HEC paper.

Figure 1. Histograms comparing planetary mass, radius, period, semi-major axis, mean distance, eccentricity, inclination, and equilibrium temperature for 695 confirmed exoplanets (red) and 1235 Kepler candidates (green). There is no mass data for the Kepler candidates.

Table 1. Comparison of the minimum, mean, and maximum value for planetary mass, radius, period, semi-major axis, mean distance, eccentricity, inclination, and equilibrium temperature for 695 confirmed exoplanets and 1235 Kepler candidates. The count column shows how much data for each parameter is available. Note: The stellar results are slightly weighted by the multiple planetary systems, there are only 571 stars in the confirmed exoplanets sample and 997 in the Kepler candidates.

Confirmed Exolanets (exoplanet.eu): 695

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                      Property         MIN         AVG         MAX       Count

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             Planet Mass (EU):        0.02      893.26     9851.80         689

           Planet Radius (EU):        1.42       12.18       24.66         193

         Planet Period (days):        0.09     2795.44   730000.00         672

  Planet Semi-Major Axis (AU):      0.0004     16.8559   2500.0000         658

              Planet Distance:      0.0004      1.4222    114.3021         602

          Planet Eccentricity:        0.00        0.20        0.97         611

           Planet Inclination:        1.00       76.48       90.00         202

           Planet Temperature:       47.52      719.42     2451.50         435


               Star Mass (SU):        0.02        1.08        4.50         611

             Star Radius (SU):        0.21        2.58       50.39         471

         Star Temperature (K):      540.00     5496.02    29300.00         553

         Star Luminosity (SU):      0.0030     10.0239    332.3029         455

           Star Distance (pc):        3.20      261.44     8500.00         621

                      Star RA:        0.00       11.81       24.00         695

                     Star Dec:      -83.77       -4.18       79.23         695

               Star Magnitude:        1.25        8.54       17.36         410

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Confirmed Exoplanets Corrections

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Corrected 1 times: HD 85512 b

Corrected 1 times: Kepler-16 (AB) b

Corrected 1 times: Kepler-9 d

Corrected 4 times: KOI-730

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Kepler Exoplanets Candidates (Borucki et al., 2011): 1235

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                      Property         MIN         AVG         MAX       Count

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             Planet Mass (EU):          --          --          --          --

           Planet Radius (EU):        0.51        4.07       60.10        1233

         Planet Period (days):        0.37       35.02    10389.00        1235

  Planet Semi-Major Axis (AU):      0.0100      0.1499      9.5140        1235

              Planet Distance:      0.0100      0.1499      9.5140        1235

          Planet Eccentricity:        0.00        0.00        0.00        1235

           Planet Inclination:       90.00       90.00       90.00        1235

           Planet Temperature:       84.00      777.13     3257.00        1233


               Star Mass (SU):        0.16        0.99        1.84        1195

             Star Radius (SU):        0.18        0.97        6.16        1195

         Star Temperature (K):     3200.00     5460.66     9034.00        1195

         Star Luminosity (SU):      0.0034      1.1018     32.7378        1194

           Star Distance (pc):       10.70      645.30     1528.65        1234

                      Star RA:       18.71       19.41       20.08        1235

                     Star Dec:       36.58       44.17       52.15        1235

               Star Magnitude:        8.22       14.28       16.42        1235

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Kepler Exoplanets Candidates Corrections

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Correted Candidates (Muirhead et al., 2011): 121

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