J/ApJ/770/43 Spectroscopic [Fe/H] of Kepler stars (Mann+, 2013)
Testing the metal of late-type Kepler planet hosts with iron-clad methods.
Mann A.W., Gaidos E., Kraus A., Hilton E.J.
<Astrophys. J., 770, 43 (2013)>
=2013ApJ...770...43M 2013ApJ...770...43M
ADC_Keywords: Abundances, [Fe/H] ; Stars, double and multiple ; Planets ;
Stars, diameters
Keywords: planetary systems; planets and satellites: detection;
planets and satellites: formation; stars: abundances; stars: late-type
Abstract:
It has been shown that F, G, and early K dwarf hosts of Neptune-sized
planets are not preferentially metal-rich. However, it is less clear
whether the same holds for late K and M dwarf planet hosts. We report
metallicities of Kepler targets and candidate transiting planet hosts
with effective temperatures below 4500K. We use new metallicity
calibrations to determine [Fe/H] from visible and near-infrared
spectra. We find that the metallicity distribution of late K and M
dwarfs monitored by Kepler is consistent with that of the solar
neighborhood. Further, we show that hosts of Earth- to Neptune-sized
planets have metallicities consistent with those lacking detected
planets and rule out a previously claimed 0.2dex offset between the
two distributions at 6σ confidence. We also demonstrate that the
metallicities of late K and M dwarfs hosting multiple detected planets
are consistent with those lacking detected planets. Our results
indicate that multiple terrestrial and Neptune-sized planets can form
around late K and M dwarfs with metallicities as low as 0.25 solar.
The presence of Neptune-sized planets orbiting such low-metallicity M
dwarfs suggests that accreting planets collect most or all of the
solids from the disk and that the potential cores of giant planets can
readily form around M dwarfs. The paucity of giant planets around M
dwarfs compared to solar-type stars must be due to relatively rapid
disk evaporation or a slower rate of planet accretion, rather than
insufficient solids to form a core.
Description:
Spectra of KOIs were obtained with the SuperNova Integral Field
Spectrograph (SNIFS) on the University of Hawaii 2.2m telescope atop
Mauna Kea. SNIFS covers 3200Å to 9700Å at a resolution of
1000<R<1300.
We obtained NIR spectra of the 100 non-KOI targets using the SpeX
spectrograph attached to the NASA Infrared Telescope Facility (IRTF)
on Mauna Kea. SpeX observations were taken with a resolution of R∼2000
from 0.8 to 2.4um.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 36 106 KOI stellar parameters
table2.dat 19 97 non-KOI stellar parameters
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See also:
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/ApJS/213/5 : Cool KOIs. VI. H- and K- band spectra (Muirhead+, 2014)
J/ApJS/211/2 : Stellar properties of Q1-16 Kepler stars (Huber+, 2014)
J/ApJS/210/1 : Asteroseismic study of solar-type stars (Chaplin+, 2014)
J/A+A/549/A8 : Atmospheric extinction data above Mauna Kea (Buton+, 2013)
J/ApJS/204/24 : Kepler planetary candidates. III. (Batalha+, 2013)
J/AJ/145/102 : Bright M dwarfs spectro. in the northern sky (Lepine+, 2013)
J/AJ/145/52 : Late K & M dwarfs abundances in binary systems (Mann+, 2013)
J/ApJ/767/95 : Parameters of smallest KIC stars (Dressing+, 2013)
J/ApJ/757/112 : Stellar diameters. II. K and M-stars (Boyajian+, 2012)
J/ApJ/753/90 : Stellar param. of K5 & later type Kepler stars (Mann+, 2012)
J/ApJ/750/L37 : Stellar parameters of low-mass KOIs (Muirhead+, 2012)
J/ApJ/748/93 : K-band spectra for 133 nearby M dwarfs (Rojas-Ayala+, 2012)
J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)
J/AJ/143/67 : SLoWPoKES II. Properties of low-mass binaries (Dhital+, 2012)
J/AJ/142/138 : All-sky catalog of bright M dwarfs (Lepine+, 2011)
J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)
J/PASP/121/117 : Fe abundances of 12 low-metallicity M stars (Woolf+, 2009)
J/A+A/487/373 : Spectroscopic param. of 451 HARPS-GTO stars (Sousa+, 2008)
J/MNRAS/389/585 : Fundamental parameters of M dwarfs (Casagrande+, 2008)
J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)
J/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002)
http://exoplanetarchive.ipac.caltech.edu/ : NASA exoplanet archive
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- KOI [227/2662] Kepler Object of Interest number
6 A1 --- f_KOI [a] Multi-planet candidate (1)
8- 15 I8 --- KIC Kepler Input Catalog identifier (V/133)
17- 21 F5.2 [Sun] [Fe/H] [-0.62/0.62] Metallicity
23- 26 F4.2 [Sun] e_[Fe/H] [0.05/0.2] The 1σ uncertainty in [Fe/H]
28- 31 F4.2 Rsun R* [0.1/0.8] Stellar radius
33- 36 F4.2 Rsun e_R* [0.03/0.06] The 1σ uncertainty in R*
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Note (1):
a = Multi-planet candidate system as listed in the Batalha et al. (2013,
J/ApJS/204/24) catalog.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC [1721911/11820505] Kepler identifier (V/133)
10- 14 F5.2 [Sun] [Fe/H] [-0.9/0.5] Metallicity
16- 19 F4.2 [Sun] e_[Fe/H] [0.05/0.3] The 1σ uncertainty in [Fe/H]
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 08-Jan-2015