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First results from CoRoT. C. Karoff H. Kjeldsen , T. Arentoft, J. Christensen-Dalsgaard Danish AsteroSeismology Centre, University of Aarhus, Department of Physics and Astronomy, Denmark Instrument Center for Danish Astrophysic, Denmark. Convection, Rotation & planetary Transits.

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first results from corot

First results from CoRoT

C. Karoff

H. Kjeldsen , T. Arentoft, J. Christensen-Dalsgaard

Danish AsteroSeismology Centre,

University of Aarhus, Department of Physics and Astronomy, Denmark

Instrument Center for Danish Astrophysic, Denmark

convection rotation planetary transits
Convection, Rotation & planetary Transits

CoRoT has two scientific objectives:

  • Stellar Seismology
  • Search for Exoplanets.

Proteus platform

  • 27 cm afocal telescope
  • 4 2kx4k frame transfer CCDs
  • Colors provided by a prism in front of two of the CCDs
27th of december 2006
27th of December 2006
  • CoRoT was launched with a Soyuz rocket from Baikonur on the 27th of December 2006.
  • Precision for Asteroseismology:

0.74 ppm in 5 days.

  • Precision for Planets: 0.075 % i one hour.
corot exo 1b
Corot-Exo-1b

Period: 1.5 d

Mass: 1.3 MJ

Radius: 1.78 RJ

slide6
M(v): 3.39
  • L/Lsun: 3.5
  • Teff: 6457 K
  • Vsin(i): 10.9 km/s
  • R/Rsun: 1.5
  • /Sun: 0.388
  • Prot: 7.0 d
intensity and sunspots
Intensity and Sunspots

Intensity from the GOLF instrument on the SOHO satellite (green channel).

Intensitygram from the MDI instrument on SOHO.

sunspots and rotation period2
Sunspots and Rotation Period

Solar rotation period at equator: 24 d

sunspots and rotation period3
Sunspots and Rotation Period

Solar rotation period at equator: 24 d

sunspots and rotation period4
Sunspots and Rotation Period

Solar rotation period at equator: 24 d

sunspots and rotation period5
Sunspots and Rotation Period

Solar rotation period at equator: 24 d

Typical spot size: 0.001

Large spots: 0.002

sunspots and rotation period6
Sunspots and Rotation Period

Rotation period: 24 d

Typical spot size: 0.001% (D ~ 44.000 km)

Large spots: 0.002% (D ~ 76.000 km)

Spot lifetime: 7-24 days (0.3-1.0 rot)

hd49933 spots and rotation period
HD49933Spots and Rotation Period

Rotation period: 3.5 d

hd49933 spots and rotation period1
HD49933Spots and Rotation Period

Rotation period: 3.5 d

hd49933 spots and rotation period2
HD49933Spots and Rotation Period

Rotation period: 3.5 d

Typical spot size: 0.0005 (D ~ 46.000 km)

Large spots: 0.0015 (D ~ 80.000 km)

Spot lifetime: 5-10 d (1.5-3 rot)

Inclination: 30o

oscillations in the sun2
Oscillations in The Sun

∆ν0 = 134.5 μHz

hd49933 the large separation
HD49933The Large Separation

l=1 l=0 l=1 l=0 l=1 l=0 l=1 l=0 l=1 l=0 l=1

∆ν0 = 85.6 μHz

hd49933 the large separation1
HD49933The Large Separation

l=1 l=0 l=1 l=0 l=1 l=0 l=1 l=0 l=1 l=0 l=1

∆ν0 = 85.6 μHz

hd49933 the small separation
HD49933The Small Separation

l=1 l=0 l=1 l=0 l=1 l=0 l=1 l=0 l=1 l=0 l=1

ν02 = 6 μHz

slide29

The SunThe Rotation Splitting

Period ~ 24 d  ~ 0.5 μHz

slide30

HD49933The Rotation Splitting

l=1 l=0 l=1 l=0 l=1 l=0 l=1 l=0 l=1 l=0 l=1

Periode ~ 3.5 d  ~ 3.3 μHz