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