A Search for Evidence of Advanced Extraterrestrial Life on Kepler Planets
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A Search for Evidence of Advanced Extraterrestrial Life on Kepler Planets. Matt Lebofsky Arielle Little Ron Maddalena Geoff Marcy Jill Tarter Dan Werthimer. Jeff Cobb Paul Demorest John Ford Andrew Howard Eric Korpela Glen Langston. Andrew Siemion, University of California, Berkeley.

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A Search for Evidence of Advanced Extraterrestrial Life on Kepler Planets

Matt Lebofsky

Arielle Little

Ron Maddalena

Geoff Marcy

Jill Tarter

Dan Werthimer

Jeff Cobb

Paul Demorest

John Ford

Andrew Howard

Eric Korpela

Glen Langston

Andrew Siemion, University of California, Berkeley



Narrowband Radio Signals Kepler Planets


Broadband Radio Pulses Kepler Planets

e

p

e

e

p

p

e

p

p

e

e

p

e

e

p

p

p

e


Observing Plan Kepler Planets


Observing Plan Kepler Planets

5 minute targeted observation of especially interesting KOIs:


Observing Plan Kepler Planets

5 minute targeted observation of especially interesting KOIs:

‘Traditional’ HZ:

-50 C < Teq< 100 C


Observing Plan Kepler Planets

5 minute targeted observation of especially interesting KOIs:

‘Traditional’ HZ:

-50 C < Teq< 100 C

Ncandidates > 4


Observing Plan Kepler Planets

5 minute targeted observation of especially interesting KOIs:

‘Traditional’ HZ:

-50 C < Teq< 100 C

Ncandidates > 4

Small, long period

P > 50d && Rp < 3 RE


Observing Plan Kepler Planets

11 hour raster scan of the entire Kepler field.

5 seconds

per 10’ beam


Radio SETI Kepler Planets


H Kepler Planets2O

O2

Galactic Synchrotron

Background

Ionospheric Reflection


18 cm Kepler Planets

hyperfine OH

21 cm

hyperfine H

“Water Hole”


Kepler SETI Band Kepler Planets

16 to 27 cm

1.1 to 1.9 GHz



Single Dish Radio Astronomy Kepler Planets

Incoming Radiation

Processing

Analog / Digital Conversion

Prime Focus

Receiver /

Amplifier

Receiver



Green Bank Ultimate Pulsar Machine (GUPPI) Kepler Planets

8 bit sampling ➡ 2 bit quantization

Raw ‘baseband’ recording

800 MHz bandwidth, 2 polarizations

~ 1 gigabyte/second to disk


Narrowband Signals Kepler Planets

Fast Fourier Transform

Dynamic Spectrum

FREQUENCY

TIME


Narrowband Signals Kepler Planets

POWER

FREQUENCY


Broadband Pulses Kepler Planets

FREQUENCY (MHz)

Assuming a model of free electron density in the ISM, we can infer a distance of ~2000 pc.

TIME (mS)


Broadband Pulses Kepler Planets

Dedispersion

FREQUENCY (MHz)

Thresholding


What could we detect? Kepler Planets


What could we detect? Kepler Planets

Broadband Pulses

Narrowband Signals


What could we detect? Kepler Planets

Broadband Pulses

Narrowband Signals


What could we detect? Kepler Planets

at 10σ:

Broadband Pulses

~1 ly

Narrowband Signals


What could we detect? Kepler Planets

at 10σ:

Broadband Pulses

~1 ly

Narrowband Signals

~1650 ly


What could we detect? Kepler Planets

at 10σ:

Broadband Pulses

~1 ly

Narrowband Signals

~1650 ly

SEFD = 10 Jy tintegration=150s tpulse=10s


Status Kepler Planets


Status Kepler Planets

Observations completed May 22, 2011

Total Data set ~50 TB


Status Kepler Planets

Total Data set ~50 TB




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