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Asteroseismology of Planet-Host Stars

Asteroseismology of Planet-Host Stars. Asteroseismology and abundance comparisons between stars with and without planets : a clue for a better understanding of their formation. Sylvie Vauclair Observatoire Midi-Pyrénées, Toulouse. Ubatuba, November 2005.

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Asteroseismology of Planet-Host Stars

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  1. Asteroseismology of Planet-Host Stars Asteroseismology and abundance comparisons between stars with and without planets : a clue for a better understanding of their formation Sylvie Vauclair Observatoire Midi-Pyrénées, Toulouse Ubatuba, November 2005

  2. Santos et al. 2005 ; 119 planet-host stars (dashed) ; 94 comparison stars (solid)

  3. Santos et al. 2005 ; 22 planet-host stars in binary systems (solid) ; dashed : single planet-host stars

  4. Beirao, Santos, Israelian, Mayor, 2005

  5. But!!! But!!! Double-diffusive convection (thermohaline) : Vauclair 2004 Also: rotation-induced mixing Santos et al 2003

  6. 1.34 1.34 1.26 1.18 1.26 1.1 1.18 1.1 1.1 1.1 1.0 1.0 Evolutionary tracks for the accretion and overmetallic cases : Y=0.27 (left) et Y=0.33 (right) (Bazot and Vauclair 2004)

  7. Accretion and overmetallic Y=0.33 (left) et Y=0.27 (right)

  8. Small separations : dn = n n,l – n n-1,l+2

  9. Second differences : d 2 n n = nn+1 + nn-1 – 2 n n n

  10. HD 17051 i Hor [Fe/H] = 0.26 log g = 4.61 ± 0.16 V = 5.40 p = 58(0.55) Log L/Lo = [0.194,0.24] Gonzalez et al. 2001 : Teff = 6136 ± 34 [Fe/H] = 0.19 ± 0.03 [Fe/H] = 0.26 Santos, Israelian, Mayor 2004 : Teff = 6252 ± 53 K [Fe/H] = 0.26 ± 0.06 One planet : 320 days Mstar = 1.32 Msun ; Mpl = 2.26MJup ????????????????????????????? Li : 2.63 (Israelian et al 2003)

  11. m Arae : HD 160691 Observations : 3 to 11 June 2004 HARPS, La Silla, Chili Spectral type : G3 V Teff = 5798+/-33 (Santos et al 2004a) V = 5.15, Hip. par 65.5+/-0.8 mas Teff = 5813+/-40 (Santos et al 2004b) log L/Lsun = 0.28+/-0.012 Teff = 5800+/-100 (Bensby et al 2003) Teff = 5811+/-45 (Laws et al 2003)

  12. m Ara b : giant Mass (Msini) 1.67 Jupiter Mean distance to star : 1.5 A.U. Orbital period : 654.5 days Excentricity : 0.31 m Ara c : giant Mass (Msini) 3.1 Jupiter Mean distance to star : 4.17 A.U. Orbital period : 2986 days Excentricity : 0.57 • Ara d : Mass (Msini) 14 earth masses • Mean distance to star : 0.09 A.U. • Orbital period : 9.55 days • Excentricity : 0

  13. Bouchy, Bazot, Santos, Vauclair, Sosnowska 2005

  14. 33 detected modes , l = 0 to 3

  15. Accretion model : Teff = 5825 ; L/Lsun = 1.887 M/Msun = 1.085 ; age = 5.803 Gyr Overmetallic model : Teff = 5769 ; L/Lsun = 1.908 M/Msun = 1.180 ; age = 4.251 Gyr dT < 10K dL < 0.02 Estimated uncertainty from seismology on: Mass : 0.01 Msun ; Age : 0.1 Gyr (Bazot, Vauclair, Bouchy, Santos 2005)

  16. Small separations : dn = n n,l – n n-1,l+2

  17. Additional Program n°20: systematic seismology of stars with detected transits (Toulouse group+post docs) Main target : HD 52265 V = 6.2 Coralie : ESO/FEROS: Teff = 6076 +/- 57 Teff = 6131 +/- 47 log g = 4.20 +/- 0.17 log g = 4.35 +/- 0.13 [Fe/H] = 0.20 +/- 0.07 [Fe/H] = 0.25 +/- 0.06

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