Wide-field millimagnitude photometry with HAT: A Tool for Extra-solar Planet Detection

Abstract

We discuss the system requirements for obtaining millimagnitude photometric precision over a wide field using small aperture short focal length telescope systems, such as are being developed by a number of research groups to search for transiting extra-solar planets. We describe the Hungarian-made Automated Telescope (HAT) system which attempts to meet these requirements. The attainable precision of HAT has been significantly improved by a technique in which the telescope is made to execute small pointing steps during each exposure so as to broaden the effective point spread function of the system to a value more compatible with the pixel size of our CCD detector. Experiments during a preliminary survey (Spring 2003) of two star fields with the HAT-5 instrument allowed us to optimize the HAT photometric precision using this method of PSF broadening; in this way have been able to achieve a precision as good as 2 millimagnitudes on brighter stars. We briefly describe development of a network of HAT telescopes (HATnet) spaced in longitude.

26 pages, 6 figures, accepted for publication in PASP (March, 2004 issue)

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• HAT-P-58b -- HAT-P-64b: Seven Planets Transiting Bright Stars
• Periodic stellar variability from almost a million NGTS light curves
• The Jay Baum Rich telescope: a Centurion 28 at the Wise Observatory
• Detecting "Temperate" Jupiters: The Prospects of Searching for Transiting Gas Giants in Habitability Zones
• An a priori investigation of astrophysical false positives in ground-based transiting planet surveys
• Exoplanets in the Antarctic Sky. I. The First Data Release of AST3-II (CHESPA) and New Found Variables within the Southern CVZ of TESS
• The Fly's Eye Camera System -- an instrument design for large étendue time-domain survey
• Eclipsing Spotted Giant Star With K2 and Historical Photometry
• Scintillation-limited photometry with the 20-cm NGTS telescopes at Paranal Observatory
• New approach for modeling of transiting exoplanets for arbitrary limb-darkening law
• The HATNet and HATSouth Exoplanet Surveys
• The Transit Timing and Atmosphere of Hot Jupiter HAT-P-37b
• Non-Sinusoidal Transit Timing Variations for the Exoplanet HAT-P-12b
• Revisiting the HD 21749 Planetary System with Stellar Activity Modeling
• On the hierarchical triple nature of the former red nova precursor candidate KIC 9832227
• Validation of HD 183579b using archival radial velocities: a warm-neptune orbiting a bright solar analog
• TSARDI: a Machine Learning data rejection algorithm for transiting exoplanet light curves
• XO-7 b: A transiting hot Jupiter with a massive companion on a wide orbit
• The DECam Minute Cadence Survey II: 49 Variables but No Planetary Transits of a White Dwarf
• Multi-filter transit observations of HAT-P-3b and TrES-3b with multiple Northern Hemisphere telescopes
• KELT: The Kilodegree Extremely Little Telescope, a Survey for Exoplanets Transiting Bright, Hot Stars
• A Method For Eclipsing Component Identification In Large Photometric Datasets
• HATS-36b and 24 other transiting/eclipsing systems from the HATSouth - K2 Campaign 7 program
• Variability and stellar populations with deep optical-IR images of the Milky Way disk: matching VVV with VLT/VIMOS data
• The Hubble Catalog of Variables (HCV)
• HSTEP -- Homogeneous Studies of Transiting Extrasolar Planets
• A hot Jupiter transiting a mid-K dwarf found in the pre-OmegaCam Transit Survey
• The study on transiting systems HAT-P-13, HAT-P-16 and WASP-32 through combining ground-based and TESS photometry
• A new view on exoplanet transits: Transit of Venus described using three-dimensional solar atmosphere Stagger-grid simulations
• Exoplanet two square degree survey with SAO RAS robotic facilities
• The highly inflated giant planet WASP-174b
• The prospects for finding brown dwarfs in eclipsing binary systems and measuring brown dwarf properties
• HD 183579b: A Warm Sub-Neptune Transiting a Solar Twin Detected by TESS
• HATS-15 b and HATS-16 b: Two massive planets transiting old G dwarf stars
• Relative Occurrence Rate Between Hot and Cold Jupiters as an Indicator to Probe Planet Migration
• Populations of Extrasolar Giant Planets from Transit and Radial Velocity Surveys
• Remote Observatory for Variable Object Research (ROVOR)
• The DOHA algorithm: a new recipe for cotrending large-scale transiting exoplanet survey light curves
• 2MASS J01074282+4845188: a new nova-like cataclysmic star with a deep eclipse
• Variability search in M 31 using Principal Component Analysis and the Hubble Source Catalog
• Transiting Planets with LSST III: Detection Rate per Year of Operation
• An asynchronous object-oriented approach to the automation of the 0.8-meter George Mason University campus telescope in Python
• A method of photometric data extraction for asteroids from time-domain surveys
• PHASES: a concept for a satellite-borne ultra-precise spectrophotometer
• The Case for a Large-Scale Occultation Network
• Variables in the Southern Polar Region Evryscope 2016 Dataset
• More planetary candidates from K2 Campaign 5 by tran_k2
• Earth through the looking glass: how frequently are we detected by other civilisations through photometric microlensing?
• New Exoplanet Surveys in the Canadian High Arctic at 80 Degrees North
• Small Telescope Exoplanet Transit Surveys: XO
• Forecasting the detectability of known radial velocity planets with the upcoming CHEOPS mission
• Transit detections of extrasolar planets around main-sequence stars - I. Sky maps for hot Jupiters
• The contribution of the major planet search surveys to EChO target selection
• Absolute dimensions of the low-mass eclipsing binary system NSVS 10653195
• Extraction of Physical Parameters of RRab Variables using Neural Network based Interpolator
• Planet Hunters NGTS: New Planet Candidates from a Citizen Science Search of the Next Generation Transit Survey Public Data
• Generation of an optimal target list for the Exoplanet Characterisation Observatory (EChO)
• Synergies between Exoplanet Surveys and Variable Star Research
• Ground-Based Photometric Searches for Transiting Planets
• Finding the Brightest Galactic Bulge Microlensing Events with a Small Aperture Telescope and Image Subtraction
• Rotation of planet-harbouring stars
• Transit-period search from single-event space-based data: the role of wide-field surveys
• Using chromatic covariance to correct for scintillation noise in ground-based spectrophotometry
• Searching for Exosatellites Orbiting L and T Dwarfs: Connecting Planet Formation to Moon Formation and Finding New Temperate Worlds
• The Transits of Extrasolar Planets with Moons
• HAT-P-68b: A Transiting Hot Jupiter Around a K5 Dwarf Star
• TOI-1518b: A Misaligned Ultra-hot Jupiter with Iron in its Atmosphere
• Photometric analysis of the eclipsing binary 2MASS 19090585+4911585
• Transit Timing Variations of the Sub-Saturn Exoplanet HAT-P-12b
• K2-99 revisited: a non-inflated warm Jupiter, and a temperate giant planet on a 522-d orbit around a subgiant
• A Uniform Search for Nearby Planetary Companions to Hot Jupiters in TESS Data Reveals Hot Jupiters are Still Lonely
• The Impact of Transiting Planet Science on the Next Generation of Direct-Imaging Planet Searches
• The rich frequency spectrum of the triple-mode variable AC And