Download Metallicity distribution for planet

Metallicity-planet occurrence
PTPS
Metallicity distribution for planet-hosting
stars from Penn State - Torun Planet Search
Beata Deka-Szymankiewicz
Michalina Adamczyk, Andrzej Niedzielski
Nicolaus Copernicus University, Toruń, Poland
30.06.2015
Metallicity distribution for planet-hosting stars from Penn State - Torun Planet Search
Metallicity-planet occurrence
PTPS
Planet-metallicity relation:
the fact that giant planets hosts (solar-type dwarfs) are more
metal-rich than stars without planet companions is well
accepted.
is the metallicity of host star an important factor connected to
the formation of planetary system?
is there a planet occurrence - host metallicity relation for
giants?
Metallicity distribution for planet-hosting stars from Penn State - Torun Planet Search
Metallicity-planet occurrence
PTPS
Mechanisms of planet formation:
core accretion (Safronov, 1960; Pollack et al., 1996)
formation of planet comes from the collisional accretion of
planetesimals (dependence on metallicity)
gravitational disk instability (Bodenheimer, 1974; Boss, 1997):
formation of planet comes from the collapse of an unstable
part of the protoplanetary disk (NO dependence on
metallicity)
Metallicity distribution for planet-hosting stars from Penn State - Torun Planet Search
Metallicity-planet occurrence
PTPS
Dwarfs
Subgiants
Giants
Planet-metallicity relation (dwarfs):
Fischer & Valenti (2005) concluded that there is planet-metallicity
relation: occurrence of gas giant planets around FGK-type dwarfs is very
sensitive to metallicity of host star.
Santos et al. (2001) and Ghezzi et al. (2010) showed that there is
planet-metallicity relation which means that gas giant planets host stars
(FGK-type dwarfs) tend to be more metal-rich compared to field stars
without gas giant planets.
Johnson et al. (2010) indicated that there is planet-metallicity relation:
positive metallicity-planet occurrence relation for M-dwarf host stars,
however it is lower compared to solar-mass stars.
Buchhave et al. (2012) concluded that there is planet-metallicity relation
and the average metallicity for giant planets host stars (late-type dwarfs)
is higher than for smaller planets.
Wang et al. (2015) showed that there is planet-metallicity relation for
planets of all sizes around metal-rich host stars (4800K < Teff ¬ 6500K,
log(g) ­ 4.2) which tend to be more abundant than around metal-poor
stars.
Metallicity distribution for planet-hosting stars from Penn State - Torun Planet Search
Metallicity-planet occurrence
PTPS
Dwarfs
Subgiants
Giants
Planet-metallicity relation (subgiants):
Fischer & Valenti (2005) showed that there is
planet-metallicity relation and metallicity distribution of
subgiants with planets is compatible with dwarf stars with
planets.
Ghezzi et al. (2010) and Jofré et al. (2015) indicated that
there is planet-metallicity relation which means that subgiants
with gas giant planets tend to be more metal-rich than
subgiant stars without gas giant planets.
Ghezzi et al. (2010) and Jofré et al. (2015) concluded that
there is planet-metallicity relation, subgiant host stars show
similar planet-metallicity relation compared with
main-sequence host stars.
Metallicity distribution for planet-hosting stars from Penn State - Torun Planet Search
Metallicity-planet occurrence
PTPS
Dwarfs
Subgiants
Giants
Planet-metallicity relation (giants):
Hekker & Meléndez (2007) and Reffert et al. (2015) showed that
there is planet-metallicity relation and giant stars with planets have
higher metallicity than average metallicity of giants without planet
companions.
Pasquini et al. (2007) and Takeda et al. (2008) concluded that
there is NO planet-metallicity relation: there is a lack of positive
metallicity-planet occurrence for planet host giant stars.
Mortier et al. (2013) showed that there is NO planet-metallicity
relation which means that the mean metallicity of planet host giant
stars is lower than dwarfs with planets.
Jofré et al. (2015) indicated that there is NO planet-metallicity
relation: there are no differences between metallicity of giants with
and without planets.
Metallicity distribution for planet-hosting stars from Penn State - Torun Planet Search
Metallicity-planet occurrence
PTPS
Pennsylvania-Torun Planet Search
PTPS planets
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0.5
1.0
0.5
3M ¯
3M ¯
0.0
[Fe/H]
log L/L ¯
Pennsylvania-Torun Planet Search (PTPS) sample:
0.5
1M ¯
1M ¯
[Fe/H]=0.00
[Fe/H]=-0.30
6000 5500 5000 4500 4000
Teff [K]
Metallicity distribution for planet-hosting stars from Penn State - Torun Planet Search
1.0
1.5
Metallicity-planet occurrence
PTPS
Pennsylvania-Torun Planet Search
PTPS planets
Metallicity of PTPS sample:
1.0
RGC stars (Zielinski et al. (2012))
Subgiants & Giants (Niedzielski et al. - in prep.)
Dwarfs (Deka-Szymankiewicz et al. - in prep.)
0.5
[Fe/H]
0.0
−0.5
−1.0
−1.5
1
2
3
log g
4
Metallicity distribution for planet-hosting stars from Penn State - Torun Planet Search
5
Metallicity-planet occurrence
PTPS
Pennsylvania-Torun Planet Search
PTPS planets
Metallicity for evolved stars from several projects:
350
300
250
PTPS
Wang et al. 2011
Takeda et al. 2008
Liu et al. 2010
Reffert et al. 2015
Alves et al. 2015
Jones et al. 2011
N
200
150
100
50
0
−2.0
−1.5
−1.0
−0.5
[Fe/H]
0.0
Metallicity distribution for planet-hosting stars from Penn State - Torun Planet Search
0.5
1.0
Metallicity-planet occurrence
PTPS
Pennsylvania-Torun Planet Search
PTPS planets
PTPS planets and metallicity:
175
RGC stars (Zielinski et al. (2012))
PTPS planet host stars
6.75%
Kolmogorov-Smirnov
test results:
D = 0.34
p-value = 0.03
150
125
N
100
K-S test shows that
the metallicity
distribution of giants
with planets is
consistent with that
without planets.
6.94%
75
1.82%
50
25
20%
−1.00
−0.75
−0.50
−0.25
0.00
0.25
0.50
[Fe/H]
Metallicity distribution for planet-hosting stars from Penn State - Torun Planet Search
Metallicity-planet occurrence
PTPS
Pennsylvania-Torun Planet Search
PTPS planets
Conclusions:
PTPS sample (RGC) shows no evidence of planet occurrence stellar metallicity relation
only uniform samples suitable for such studies.
Metallicity distribution for planet-hosting stars from Penn State - Torun Planet Search