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WE PROPOSE THE FIRST SYSTEMATIC SEARCH FOR ROTATION PERIODS FROM FIELD STARS IN THE K2 ARCHIVE. OUR STUDY WILL PRODUCE A CATALOG OF NEARLY 100 000 STELLAR ROTATION PERIODS MEASURED WITH KEPLER/K2. THIS LARGE DATASET OF ROTATION PERIODS ALLOWS US TO CREATE AN AGE MAP OF THE STARS WITHIN EACH FIELD OF VIEW IN THE K2 MISSION AND TO DETERMINE THE CAUSE OF THE MYSTERIOUS DISTRIBUTION OF ROTATION PERIODS DISCOVERED PREVIOUSLY WITH KEPLER. AGE IS TYPICALLY THE MOST DIFFICULT BASIC PROPERTY TO MEASURE FOR STARS YET ITS KEY TO UNDERSTANDING THE FORMATION HISTORY OF THE MILKY WAY AS WELL AS EXOPLANET SYSTEM FORMATION AND EVOLUTION. ROTATION GIVES THE MOST USEFUL "CLOCK" FOR NORMAL ISOLATED STARS DUE TO STEADY ANGULAR MOMENTUM LOSS DURING MAJORITY OF STAR'S LIFE. KEPLER/K2 ARE THE IDEAL DATASETS FOR CONDUCTING A SURVEY OF STELLAR ROTATION DUE TO LONG OBSERVATION DURATIONS AND VERY PRECISE MONITORING TO DETECT FAINT MODULATION DUE TO COOL STARSPOTS ROLLING IN-TO AND OUT-OF VIEW. PREVIOUS RESULTS FROM KEPLER REVEALED A TWO-PEAKED DISTRIBUTION OF ROTATION PERIODS FOR STARS. TWO SCENARIOS HAVE BEEN PROPOSED TO EXPLAIN THIS FEATURE AND BOTH REQUIRE A GREATER SAMPLE OF ROTATION TO BE AMASSED. TO ACCOMPLISH THESE GOALS WE WILL USE NEW OPEN SOURCE TOOLS BASED ON "GAUSSIAN PROCESSES" TO REMOVE SYSTEMATIC NOISE AND MEASURE PERIODIC SIGNALS IN THE K2 DATA. STELLAR AGES ARE ESTIMATED USING SPIN-DOWN MODELS UPDATED FROM KEPLER DATA. WITH THE WIDE VARIETY OF STARS FROM ACROSS THE GALAXY CONTAINED IN THE K2 DATASET WE WILL DETERMINE HOW FAR FROM THE SUN THE TWO-PEAKED PERIOD DISTRIBUTION EXISTS. THE RESULTS FROM OUR GLOBAL K2 PERIOD SEARCH WILL CONTRIBUTE TO THE IMPORTANT LEGACY OF THE KEPLER MISSION FOR STUDYING STELLAR ASTROPHYSICS. AS NEW MODELS ARE PRODUCED TO INVESTIGATE THE NATURE OF STELLAR ANGULAR MOMENTUM LOSS AND MAGNETIC ACTIVITY THIS DATASET WILL BE A BENCHMARK FOR STUDYING THESE BASIC PROPERTIES FOR STARS OF ALL AGES. THE TOOLS AND DATA PRODUCTS DEVELOPED WILL ALSO BE VALUABLE TESTBEDS FOR MEASURING ROTATION PERIODS AND AGES OF STARS IN NASA'S UPCOMING TESS MISSION.

$151,265FY2020National Aeronautics and Space AdministrationNASA

University Of Washington, Seattle WA

Investigators

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