Precision Radial Velocities in the Near Infrared with TEDI James - - PowerPoint PPT Presentation

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precision radial velocities in the near infrared with tedi
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Precision Radial Velocities in the Near Infrared with TEDI James - - PowerPoint PPT Presentation

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Precision Radial Velocities in the Near Infrared with TEDI James Lloyd (Cornell University) Do there exist many worlds, or is there but a single world? This is one of the most noble and exalted questions in the study of Nature.

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SLIDE 1

Precision Radial Velocities in the Near Infrared with TEDI

James Lloyd (Cornell University)

“Do there exist many worlds, or is there but a single world? This is one of the most noble and exalted questions in the study of Nature.”

  • Albertus Magnus

1193-1280

Wednesday, August 18, 2010

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SLIDE 2

Outline

  • M dwarfs & Infrared RV
  • Transits
  • Accuracy, precision and efficiency
  • TripleSpec Exoplanet Discovery Instrument

Declare victory: 60/40 by talk emphasis

Wednesday, August 18, 2010

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SLIDE 3

A brief history of Exoplanets

Giordano Bruno

“Thus is the excellence of God magnified and the greatness of his kingdom made manifest; He is glorified not in one, but in countless suns; not in a single earth, a single world, but in a thousand thousand, I say in an infinity of worlds!”

Executed in 1600

De l'Infinito, Universo e Mondi (1584),

Wednesday, August 18, 2010

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SLIDE 4

Rate of Discovery

Wednesday, August 18, 2010

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SLIDE 5

The Pothole of Comte’s Positivism

!“we can determine the shapes, distances, sizes, and motions of celestial bodies, but never, by any means, will we be able to study their chemical compositions.”

Auguste Comte, 1835

Wednesday, August 18, 2010

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SLIDE 6

Mass + Size = Density

Wednesday, August 18, 2010

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SLIDE 7

Transits ! Astrophysics

credit: J. Fortney Zapolsky & Salpeter 1969

!

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SLIDE 8

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SLIDE 9

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SLIDE 10

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SLIDE 11

Transiting planets around M-dwarfs enables detection of Earth-radius planets from the ground

Secondary Transit In R-J limit:

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SLIDE 12

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SLIDE 13

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Wednesday, August 18, 2010

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SLIDE 14

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Wednesday, August 18, 2010

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SLIDE 15

There is no gas cell analog of Iodine cell technique for M dwarfs

For calibration derived from an absorption cell, precision is set by the smaller of Qstar and Qabs

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SLIDE 16

Line vs Continuum Opacity

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SLIDE 17

O;V9

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Wednesday, August 18, 2010

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SLIDE 18

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Wednesday, August 18, 2010

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SLIDE 19

Think Picket Fence

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SLIDE 20

Picket Fence

= Moiré = Vernier Caliper = Beat Frequency = Spatial Frequency Heterodyning

Wednesday, August 18, 2010

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SLIDE 21

21

Moiré is a heterodyning effect

Spectral Frequency Components

Wednesday, August 18, 2010

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SLIDE 22

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SLIDE 23

First Fringes Dec 30 2007

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SLIDE 24

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Wednesday, August 18, 2010

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SLIDE 25

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SLIDE 26

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Wednesday, August 18, 2010

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SLIDE 27

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Wednesday, August 18, 2010

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SLIDE 28

Summary

  • Accuracy, not just precision is critical for the M dwarf
  • pportunity
  • T-EDI is achieving ~20 ms -1 intranight, 40 ms -1 night-to-

night, 80 ms -1 month-to-month precision

  • Accuracy is 12 m/s BarnardStar-Hale-decihr-1/2
  • = 1 philmuirhead -1

Wednesday, August 18, 2010