A Technique to Derive Improved Proper Motions for Kepler Objects of Interest

Abstract

We outline an approach yielding proper motions with higher precision than exists in present catalogs for a sample of stars in the Kepler field. To increase proper motion precision we combine first moment centroids of Kepler pixel data from a single Season with existing catalog positions and proper motions. We use this astrometry to produce improved reduced proper motion diagrams, analogous to a Hertzsprung-Russell diagram, for stars identified as Kepler Objects of Interest. The more precise the relative proper motions, the better the discrimination between stellar luminosity classes. With UCAC4 and PPMXL epoch 2000 positions (and proper motions from those catalogs as quasi-bayesian priors) astrometry for a single test Channel (21) and Season (0) spanning two years yields proper motions with an average per-coordinate proper motion error of 1.0 millisecond of arc per year, over a factor of three better than existing catalogs. We apply a mapping between a reduced proper motion diagram and an HR diagram, both constructed using HST parallaxes and proper motions, to estimate Kepler Object of Interest K-band absolute magnitudes. The techniques discussed apply to any future small-field astrometry as well as the rest of the Kepler field.

arXiv commentAccepted to The Astronomical Journal 15 August 2014

References in corpus (31)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Dartmouth Stellar Evolution Database
• The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)
• Kepler Input Catalog: Photometric Calibration and Stellar Classification
• The PPMXL catalog of positions and proper motions on the ICRS. Combining USNO-B1.0 and 2MASS
• Validation of Kepler's Multiple Planet Candidates. III: Light Curve Analysis & Announcement of Hundreds of New Multi-planet Systems
• Masses, Radii, and Orbits of Small Kepler Planets: The Transition from Gaseous to Rocky Planets
• Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic Cepheid Variable Stars: Period-Luminosity Relations
• Interferometric Astrometry of Proxima Centauri and Barnard's Star Using Hubble Space Telescope Fine Guidance Sensor 3: Detection Limits for sub-Stellar Companions
• Astrometry with Hubble Space Telescope: A Parallax of the Fundamental Distance Calibrator delta Cephei
• Selection, Prioritization, and Characteristics of Kepler Target Stars
• A High Contrast Imaging Survey of SIM Lite Planet Search Targets
• The Extrasolar Planet epsilon Eridani b - Orbit and Mass
• Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations
• Instrument Performance in Kepler's First Months
• Confirmation of Errors in Hipparcos Parallaxes from HST/FGS Astrometry of the Pleiades
• The Kepler Pixel Response Function
• An observational correlation between stellar brightness variations and surface gravity
• Distance Scale Zero-Points from Galactic RR Lyrae Star Parallaxes
• The Mass of the Candidate Exoplanet Companion to HD 33636 from Hubble Space Telescope Astrometry and High-Precision Radial Velocities
• HST/FGS Parallaxes of AM CVn Stars and Astrophysical Consequences
• Objects in Kepler's Mirror May be Larger Than They Appear: Bias and Selection Effects in Transiting Planet Surveys
• Transit Target Selection Using Reduced Proper Motions
• Astrometry with the Hubble Space Telescope: Trigonometric Parallaxes of Planetary Nebula Nuclei: NGC 6853, NGC 7293, Abell 31, and DeHt 5
• Interferometric Astrometry with Hubble Space Telescope Fine Guidance Sensor 3:The Parallax of the Cataclysmic Variable TV Columbae
• Interferometric Astrometry of the Low-mass Binary Gl 791.2 (= HU Del) Using Hubble Space Telescope Fine Guidance Sensor 3: Parallax and Component Masses
• The Mass of the Candidate Exoplanet Companion to HD136118 from Hubble Space Telescope Astrometry and High-Precision Radial Velocities
• Astrometry with the Hubble Space Telescope: Trigonometric Parallaxes of Selected Hyads
• HST Fine Guidance Sensor Parallaxes for Four Classical Novae
• The true stellar parameters of the Kepler target list
• Interferometric Astrometry of the Detached White Dwarf - M Dwarf Binary Feige 24 Using Hubble Space Telescope Fine Guidance Sensor 3: White Dwarf Radius and Component Mass Estimates

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