Identification and Removal of Noise Modes in Kepler Photometry

We present the transiting exoearth robust reduction algorithm (TERRA)—a novel framework for identifying and removing instrumental noise in Kepler photometry. We identify instrumental noise modes by finding common trends in a large ensemble of light curves drawn from the entire Kepler field of view. Strategically, these noise modes can be optimized to reveal transits having a specified range of timescales. For Kepler target stars of low photometric noise, TERRA produces ensemble-calibrated photometry having 33 ppm rms scatter in 12 hr bins, rendering individual transits of Earth-size planets around Sun-like stars detectable as ~3σ signals.

[1]  Eric Jones,et al.  SciPy: Open Source Scientific Tools for Python , 2001 .

[2]  K. Covey,et al.  CHARACTERIZING THE COOL KOIs. III. KOI 961: A SMALL STAR WITH LARGE PROPER MOTION AND THREE SMALL PLANETS , 2012, 1201.2189.

[3]  Debra A. Fischer,et al.  Planet Hunters: New Kepler planet candidates from analysis of quarter 2 , 2013 .

[4]  John Asher Johnson,et al.  ON THE LOW FALSE POSITIVE PROBABILITIES OF KEPLER PLANET CANDIDATES , 2011, 1101.5630.

[5]  R. W. Noyes,et al.  A trend filtering algorithm for wide-field variability surveys , 2004 .

[6]  Austin,et al.  KEPLER'S FIRST ROCKY PLANET: KEPLER-10b , 2011, 1102.0605.

[7]  N. Radziwill,et al.  Software and Cyberinfrastructure for Astronomy , 2010 .

[8]  Tsevi Mazeh,et al.  Correcting systematic effects in a large set of photometric light curves , 2005, astro-ph/0502056.

[9]  Warren R. Brown,et al.  Kepler-16: A Transiting Circumbinary Planet , 2011, Science.

[10]  Sara Seager,et al.  Two Earth-sized planets orbiting Kepler-20 , 2011, Nature.

[11]  C. Lintott,et al.  Planet Hunters: the first two planet candidates identified by the public using the Kepler public archive data , 2011, 1109.4621.

[12]  John D. Hunter,et al.  Matplotlib: A 2D Graphics Environment , 2007, Computing in Science & Engineering.

[13]  Brian E. Granger,et al.  IPython: A System for Interactive Scientific Computing , 2007, Computing in Science & Engineering.

[14]  M. R. Haas,et al.  A closely packed system of low-mass, low-density planets transiting Kepler-11 , 2011, Nature.

[15]  F. Fressin,et al.  CHARACTERISTICS OF PLANETARY CANDIDATES OBSERVED BY KEPLER. II. ANALYSIS OF THE FIRST FOUR MONTHS OF DATA , 2011, 1102.0541.