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NASA Ames Research Center


Discovery paper: Dan Fabrycky, lead author for Kepler-29, 30, 31 and 32 - Transit Timing Observations From Kepler: IV. Confirmation Of 4 Multiple Planet Systems By Simple Physical Models
See also Kepler news item.

Stellar Parameters

Properties of target stars, Kepler-29 through -32
Fig. 1 Properties of target stars.
Note.—Information mostly from the Kepler Input Catalog.
a Contamination for each season 0-3 ( season = (quarter+2) mod 4 ): the fractional amount of light leaking in to the target’s aperture from other stars, known from the Kepler Input Catalog.
b Combined differential photometric hour timescales.
Stellar properties of host stars Kepler-29 through -32
Fig. 2 Stellar Properties of Hosts.
a Sources for stellar properties. Spectroscopic parameter with uncertainties indicated in parentheses are from: K=Keck Observatory, L=Lick Observatory, M=McDonald Observatory, N=NOAO. Quoted uncertainties do not include systematic uncertainties due to stellar models.

System Parameters

Kepler-32b System Parameters
a BJD-2454900. Rather than statistical error bars, we report the RMS of the measured transit timing deviations.
b Derived from the measured transit times. Error bar is the RMS of the measured transit timing deviations, divided by the number of transits that the data span.
c Duration of time that the center of the planet overlies the stellar disk.
d Values with ± error bars are from formal fits. However, often we found b and u to be quite poorly constrained and/or degenerate, so we computed grids in b, u ∈ [0, 1], and give either a 2–σχ2 = 4) range, or if this range covers the whole grid, no value at all.
e Takes into account contamination values from Fig. 1 above.
f Using stellar radii from Fig. 2 above.
g Based on assumption of dynamical stability and stellar mass from Fig. 2 above.

Light Curve

Kepler-32b Light Curve
Kepler-32b phase curve based on detrended, normalized flux. Transit is shifted to its measured midtime, and transits with midtimes within 5 hours of a different planet’s midtime are excluded from both this plot and from the model fits. Overplotted are transit models, box-car smoothed to the 29.4 minute cadence.