kepler - hvad fik vi ud af det? · kepler - hvad fik vi ud af det? 2 . hvordan finder man en...

Hans Kjeldsen

Aarhus Universitet

Kepler - hvad fik vi ud af det?

2

Hvordan finder man en exoplanet?

• Direkte observation

• Via tyngdekraften: radialhastigheden og

positionen af moderstjernen

• Via rummets krumning – tyngdefeltet

• Via passage foran moderstjernen

Diamater(Sol) / Diamater(Jord) = 109

Overfladeareal(Sol) / Overfladeareal(Jorden) = 11900

Overfladeareal(Sol) / Overfladeareal(Jorden) = 11900

0,000084

1 år

1. Stor målenøjagtighed (0,002 %)

2. Lang observationstid (min. 3 år)

3. Mange stjerner observeret (min. 25.000)

Koch et al. 2010

Kepler Photometer

1.4

m P

rim

ary

Mir

ror

95 cm Schmidt Corrector

One Kepler CCD: 50x25 mm (2200x1024 pixels)

Focal Plane Assembly 42 CCDs with Field Flattener Lenses

Kepler was launched on 7 March 2009. Science Operations began on 12

Maý 2009.

On 14 July 2012, the Kepler spacecraft experienced a disruption in science

data due to a failure in reaction wheel 2

Following the failure of reaction wheel 4 on 11 May 2013, the Kepler

spacecraft were successful moved from a Thruster-Controlled Safe Mode to

Point Rest State

The Kepler spacecraft remains in its Point Rest State (PRS) at a present

distance of 75 million km from Earth

Kepler Spacecraft Bus

Kepler reaction wheels Kepler Star Trackers

Kepler reaction wheel

TESS bliver opsendt i 2017

Kepler Field of View: 110 square degrees

Planeter fundet med Kepler….

0,000084

1 år

HAT-P-7

HAT-P-7

Nielsen et al. 2012

23

TrES-2b … sortere end kul!

Visuelt albedo <1%

2

6

Kepler-10 lyskurve

2

7

Kepler-10 lyskurve Periode = 45,29 døgn

2

8

Kepler-10 lyskurve

Kepler-10 lyskurve

Periode = 20 timer

Period = 45.29 days

Kepler-10b

Kepler-10c

Rplanet/Rstar 0.01232 ± 0.00015

Rplanet/REarth 1.416 ± 0.034

- Batalha et al. 2011

Rplanet/Rstar 0.01254 ± 0.00013

Rplanet/REarth 1.451 ± 0.019

- All data to date

Kepler-11b

4 MJord

2 RJord

650° C

Kepler-36b / Kepler36-c

Kepler 37b

Kepler 37b: 13,4 d

Kepler 37b: 21,3 d

Kepler 37b: 39,8 d

42

43

Jord-2….

Mange

Multi-planeter

Kepler-10b

Kepler-22b

Data Confirmation

Data Confirmation

52 Kepler-62

Kepler-62

54

55

Kepler-62e 122 døgn

Kepler-62f 267 døgn

56