RoboTAP - target priorities for robotic microlensing observations

Abstract

Context. The ability to automatically select scientifically-important transient events from an alert stream of many such events, and to conduct follow-up observations in response, will become increasingly important in astronomy. With wide-angle time domain surveys pushing to fainter limiting magnitudes, the capability to follow-up on transient alerts far exceeds our follow-up telescope resources, and effective target prioritization becomes essential. The RoboNet-II microlensing program is a pathfinder project which has developed an automated target selection process (RoboTAP) for gravitational microlensing events which are observed in real-time using the Las Cumbres Observatory telescope network. Aims. Follow-up telescopes typically have a much smaller field-of-view compared to surveys, therefore the most promising microlens- ing events must be automatically selected at any given time from an annual sample exceeding 2000 events. The main challenge is to select between events with a high planet detection sensitivity, aiming at the detection of many planets and characterizing planetary anomalies. Methods. Our target selection algorithm is a hybrid system based on estimates of the planet detection zones around a microlens. It follows automatic anomaly alerts and respects the expected survey coverage of specific events. Results. We introduce the RoboTAP algorithm, whose purpose is to select and prioritize microlensing events with high sensitivity to planetary companions. In this work, we determine the planet sensitivity of the RoboNet follow-up program and provide a working example of how a broker can be designed for a real-life transient science program conducting follow-up observations in response to alerts, exploring the issues that will confront similar programs being developed for the Large Synoptic Survey Telescope (LSST) and other time domain surveys.

13 pages, 14 figures

References in corpus (36)

• A Survey of Stellar Families: Multiplicity of Solar-Type Stars
• Las Cumbres Observatory Global Telescope Network
• Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing
• One or more bound planets per Milky Way star from microlensing observations
• Unbound or Distant Planetary Mass Population Detected by Gravitational Microlensing
• OGLE 2003-BLG-235/MOA 2003-BLG-53: A planetary microlensing event
• Frequency of Solar-Like Systems and of Ice and Gas Giants Beyond the Snow Line from High-Magnification Microlensing Events in 2005-2008
• Stellar Multiplicity and the IMF: Most Stars Are Single
• Detecting Earth-Mass Planets with Gravitational Microlensing
• A Natural Formalism for Microlensing
• MOA-2011-BLG-293Lb: A test of pure survey microlensing planet detections
• A New Algorithm For Difference Image Analysis
• Discovering Galactic Planets by Gravitational Microlensing: Magnification Patterns and Light Curves
• Black Hole, Neutron Star and White Dwarf Candidates from Microlensing with OGLE-III
• Microlensing with advanced contour integration algorithm: Green's theorem to third order, error control, optimal sampling and limb darkening
• Microlensing Constraints on the Frequency of Jupiter-Mass Companions: Analysis of Five Years of PLANET Photometry
• Optical Gravitational Lensing Experiment. OGLE-1999-BUL-32: the Longest Ever Microlensing Event -- Evidence for a Stellar Mass Black Hole?
• Spitzer Parallax of OGLE-2015-BLG-0966: A Cold Neptune in the Galactic Disk
• The First Circumbinary Planet Found by Microlensing: OGLE-2007-BLG-349L(AB)c
• Evryscope science: exploring the potential of all-sky gigapixel-scale telescopes
• RoboNet-II: Follow-up observations of microlensing events with a robotic network of telescopes
• Criteria for Sample Selection to Maximize Planet Sensitivity and Yield from Space-Based Microlens Parallax Surveys
• An anomaly detector with immediate feedback to hunt for planets of Earth mass and below by microlensing
• The second multiple-planet system discovered by microlensing: OGLE-2012-BLG-0026Lb, c, a pair of jovian planets beyond the snow line
• Second-generation microlensing planet surveys: a realistic simulation
• Optimal Survey Strategies and Predicted Planet Yields for the Korean Microlensing Telescope Network
• The abundance of galactic planets from OGLE-III 2002 microlensing data
• A Metric and Optimisation Scheme for Microlens Planet Searches
• MOA-2010-BLG-073L: An M-Dwarf with a Substellar Companion at the Planet/Brown Dwarf Boundary
• ARTEMiS (Automated Robotic Terrestrial Exoplanet Microlensing Search) - A possible expert-system based cooperative effort to hunt for planets of Earth mass and below
• A Super-Jupiter orbiting a late-type star: A refined analysis of microlensing event OGLE-2012-BLG-0406
• Microlensing Sensitivity to Earth-mass Planets in the Habitable Zone
• The Variable Sky of Deep Synoptic Surveys
• Parameter degeneracies and (un)predictability of gravitational microlensing events
• The OGLE-III planet detection efficiency from six years of microlensing observations (2003 to 2008)
• Red noise versus planetary interpretations in the microlensing event OGLE-2013-BLG-446

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• Microlensing Searches for Exoplanets
• First assessment of the binary lens OGLE-2015_BLG-0232
• ROME/REA: A gravitational microlensing search for exo-planets beyond the snow-line on a global network of robotic telescopes
• OGLE-2018-BLG-0022: A Nearby M-dwarf Binary
• OGLE-2014-BLG-1186: gravitational microlensing providing evidence for a planet orbiting the foreground star or for a close binary source?
• An analysis of binary microlensing event OGLE-2015-BLG-0060
• RTModel: a platform for real-time modeling and massive analysis of microlensing events
• Models of the night-sky brightness and the efficiency of searching for exoplanets with the microlensing method