LOFAR Searches for Radio Exoplanets

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Presentation transcript:

LOFAR Searches for Radio Exoplanets Jake D. Turner University of Virginia astrojaketurner@gmail.com

Exoplanet Magnetic Fields Motivation Interior structure Star-planet Interactions Habitability Jake Turner (University of Virginia) AAS 232: June 4, 2018

Detection of Magnetic Fields Radio emission observations Solar System Radio Spectrum Space Ground fg = 2.8 (Bp/G) MHz Bp: Planetary B-field 100% circularly polarized Flux (Planet) ≥ Flux (star) Jake Turner (University of Virginia) AAS 232: June 4, 2018

LOFAR 55 Cnc Observations Intensity (SEFD) Phase (Days) 55 Cnc Beam Sky Beam 16-73 MHz No emission from 55 Cnc in total intensity Jake Turner (University of Virginia) AAS 232: June 4, 2018

Jupiter as an Exoplanet 28 Intensity (SEFD) Time (s) Frequency (MHz) 26 24 16 18 20 22 Detection Limit: 65 light years if strength of emission is 100,000x Jupiter’s circularly polarization emission Can be used as a guide in exoplanet radio search Jake Turner (University of Virginia) AAS 232: June 4, 2018

Summary No emission seen in the 55Cnc exoplanet system in total intensity Modeled radio emission of Jupiter as a proxy for exoplanet emission for the first time Detection Limit: Up to 65 light years if strength of emission is 100,000x Jupiter’s circularly polarized emission Exoplanetary magnetic fields will help us learn about the planet’s interior structure, possible star-planet Interactions and even its habitability Email: astrojaketurner@gmail.com