Hugh Jones
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Transcript of Hugh Jones
Hugh JonesHugh Jones
Frequency of low-mass exoplanets .. what about
the non-detections?
SIMON O’TOOLE (AAO/HERTFORDSHIRE), CHRIS TINNEY, JEREMY BAILEY, ROB
WITTENMYER (UNSW), PAUL BUTLER (CARNEGIE), BRAD CARTER (SOUTHERN
QUEENSLAND)
Planet mass functionPlanet mass function
Earth Neptune Jupiter
Exoplanet distributionsExoplanet distributions
AAPS (Anglo-Australian Planet AAPS (Anglo-Australian Planet Search)Search)
Nearly 300 nights over last 10 years on 250, V< 7.7 F, G, K, M IV, V stars selected on CaHK and observed with S/N=200 has yielded more than 30 nearby exoplanets (and 18 spectroscopic binaries)
Recent programme of operational upgradesObserving sequencerAutomated iodine cellExposure meter
Near future – fibre feed
Many ‘noise’ componentsMany ‘noise’ componentse.g., asteroseismological e.g., asteroseismological
signalsignal
asteroseismological signal function asteroseismological signal function of L/Mof L/M
Based on Sun, Kjeldsen et al. 2008, Alpha Cen A varies by ~20%
plus ~10% over Solar cycle
Strategy continuous long Strategy continuous long blocks of telescope timeblocks of telescope time
48 night 48 night run on 24 run on 24 bright starsbright stars
ExoplanetsExoplanets
Development of robust Development of robust simulation system for AAPS simulation system for AAPS datadata
Differences between by star-by-Differences between by star-by-star simulations star simulations
Differences between by star-by-Differences between by star-by-star simulations star simulations
DetectabiliDetectability on 48 ty on 48 night runnight run
Detectability sensitive to mass Detectability sensitive to mass functionfunction
0.01 -10 MJ lines of increasing thickness
Mass function dN/dM ~MMass function dN/dM ~M-1-1 (~17% of planets host planets with >3 M(~17% of planets host planets with >3 MEE and <16 days) and <16 days)
ConclusionsConclusions
Simulation system can provide assessment of exoplanetary architectures based on RV data
With multiple telescopes and long campaigns (1m/s precision) can constrain Saturn mass planets out to 6 AUNeptune mass planets out to 1 AUSuper-Earths out to 0.3 AUEarth-mass planets out to 0.1 AU