Extra solar planets
This presentation is the property of its rightful owner.
Sponsored Links
1 / 25

Extra Solar Planets PowerPoint PPT Presentation


  • 54 Views
  • Uploaded on
  • Presentation posted in: General

Extra Solar Planets. Geoff Bower. Radial Velocity Detection of Exoplanets. Exoplanet Statistics from Radial Velocity Variations. Transits. HD 209458 Henry et al 1999. Requirements for Transit Detection of Earth. Photometric sensitivity ~ 10^-5 Nstars >> 10^3 Time resolution ~ hours

Download Presentation

Extra Solar Planets

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Extra solar planets

Extra Solar Planets

Geoff Bower

The Transient Universe: AY 250 Spring 2007


Radial velocity detection of exoplanets

Radial Velocity Detection of Exoplanets

The Transient Universe: AY 250 Spring 2007


Exoplanet statistics from radial velocity variations

Exoplanet Statistics from Radial Velocity Variations

The Transient Universe: AY 250 Spring 2007


Transits

Transits

HD 209458

Henry et al 1999

The Transient Universe: AY 250 Spring 2007


Extra solar planets

The Transient Universe: AY 250 Spring 2007


Extra solar planets

The Transient Universe: AY 250 Spring 2007


Requirements for transit detection of earth

Requirements for Transit Detection of Earth

  • Photometric sensitivity ~ 10^-5

  • Nstars >> 10^3

  • Time resolution ~ hours

  • Duration ~ years

  • Continuous viewing

The Transient Universe: AY 250 Spring 2007


Tres transiting extrasolar planet search

TrESTransiting Extrasolar Planet Search

  • 3 x 10 cm telescopes

  • 6 x 6 deg FOV

  • V< 16 mag

  • 0.005 mag in 10 minutes

The Transient Universe: AY 250 Spring 2007


Tres 2 planet in kepler field

TrES-2 Planet in Kepler Field

T=2.5 days

M=1.3 MJupR=1.2 MJup

O’Donovan et al 2006

The Transient Universe: AY 250 Spring 2007


All transiting planets

All Transiting Planets

Charbonneau et al 2006

The Transient Universe: AY 250 Spring 2007


Extra solar planets

TreS-1

HD 209458

Star spot causes bump

The Transient Universe: AY 250 Spring 2007


Scintillation noise

Scintillation Noise

< 1sec

TrES

Dunham et al 2004

Dravins et al 1997

The Transient Universe: AY 250 Spring 2007


Kepler

Kepler

The Transient Universe: AY 250 Spring 2007


Kepler observing program

Kepler Observing Program

  • 4 years

  • Continuous observing

  • 100 square degrees

  • 1.4m mirror/0.95 m corrector

  • 2” pixels

  • 42 x 1024 x 2200 pixels

  • Photometry for 100,00 stars

The Transient Universe: AY 250 Spring 2007


Photometry for 100 000 stars

Photometry for 100,000 Stars

  • Subset of pixels selected from photometry

  • Integrated for 15 minutes

  • Smaller subset with 1 minute integrations

  • 10^7 measurements/day x ~10-100 pixels/star

    •  GB/day

The Transient Universe: AY 250 Spring 2007


Extra solar planets

  • Poisson Noise ~ 1/sqrt(Nphotons)

  • Poisson noise sets mirror size

  • Stellar variability is the big unknown and factor to be controlled

The Transient Universe: AY 250 Spring 2007


Extra solar planets

450,000 stars brighter than 15th mag

The Transient Universe: AY 250 Spring 2007

Basri et al 2005


Most stars are inactive

Most Stars Are Inactive

The Transient Universe: AY 250 Spring 2007


Solar variability

Solar Variability

The Transient Universe: AY 250 Spring 2007


Extra solar planets

Hall et al 2007

The Transient Universe: AY 250 Spring 2007


Stellar variability

Stellar Variability

The Transient Universe: AY 250 Spring 2007


Variability limits on planet size

Variability Limits on Planet Size

The Transient Universe: AY 250 Spring 2007


Simulated transit

Simulated Transit

Matched filter search

The Transient Universe: AY 250 Spring 2007


Extra solar planets

Semi-major axis

1500 Earth mass planets detected in first year

4500 in four years

Assuming 3 terrestrial planets/star

The Transient Universe: AY 250 Spring 2007


Planet detection validation

Planet Detection Validation

  • 7 sigma detection (total) in >=4 transits

  • Period constant to 10 ppm from at least 3 transits

  • Duration, depth, shape consistent

  • Star centroid the same in and out of transit

    • Reject background eclipsing star

  • Radial velocity follow-up consistent

  • High resolution imaging

The Transient Universe: AY 250 Spring 2007


  • Login