J/AJ/155/68 Elemental abundances of KOIs in APOGEE. I. (Wilson+, 2018)
Elemental abundances of Kepler Objects of Interest in APOGEE.
I. Two distinct orbital period regimes inferred from host star iron abundances.
Wilson R.F., Teske J., Majewski S.R., Cunha K., Smith V., Souto D.,
Bender C., Mahadevan S., Troup N., Prieto C.A., Stassun K.G.,
Skrutskie M.F., Almeida A., Garcia-Hernandez D.A., Zamora O., Brinkmann J.
<Astron. J., 155, 68 (2018)>
=2018AJ....155...68W 2018AJ....155...68W (SIMBAD/NED BibCode)
ADC_Keywords: Exoplanets ; Stars, double and multiple ; Effective temperatures ;
Abundances, [Fe/H]
Keywords: planetary systems - planets and satellites: formation -
stars: abundances
Abstract:
The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
has observed ∼600 transiting exoplanets and exoplanet candidates from
Kepler (Kepler Objects of Interest, KOIs), most with ≥18 epochs.
The combined multi-epoch spectra are of high signal-to-noise ratio
(typically ≥100) and yield precise stellar parameters and chemical
abundances. We first confirm the ability of the APOGEE abundance
pipeline, ASPCAP, to derive reliable [Fe/H] and effective temperatures
for FGK dwarf stars - the primary Kepler host stellar type - by comparing
the ASPCAP-derived stellar parameters with those from independent
high-resolution spectroscopic characterizations for 221 dwarf stars in
the literature. With a sample of 282 close-in (P<100 days) KOIs observed
in the APOGEE KOI goal program, we find a correlation between orbital
period and host star [Fe/H] characterized by a critical period,
Pcrit=8.3-4.1+0.1 days, below which small exoplanets orbit
statistically more metal-enriched host stars. This effect may trace a
metallicity dependence of the protoplanetary disk inner radius at the
time of planet formation or may be a result of rocky planet ingestion
driven by inward planetary migration. We also consider that this may
trace a metallicity dependence of the dust sublimation radius, but we
find no statistically significant correlation with host Teff and
orbital period to support such a claim.
Description:
All the data in this work were collected as part of APOGEE in the 14th
Data Release (DR14, Abolfathi et al. 2018ApJS..235...42A 2018ApJS..235...42A) of the third
and fourth Sloan Digital Sky Survey (Eisenstein et al. 2011AJ....142...72E 2011AJ....142...72E;
Blanton et al. 2017AJ....154...28B 2017AJ....154...28B). APOGEE utilizes a multi-object
spectrograph (Wilson et al. 2010SPIE.7735E..1CW, 2012AAS...21942802W)
mounted on the Sloan 2.5 m telescope (Gunn et al. 2006AJ....131.2332G 2006AJ....131.2332G)
to sample up to 300 sources simultaneously with high-resolution (R∼22500),
high signal-to-noise ratio (S/N>100), H-band (1.5-1.7 µm) spectroscopy.
All of the data from APOGEE are processed through automated reduction
and stellar parameter pipelines (Holtzman et al. 2015AJ....150..148H 2015AJ....150..148H;
Nidever et al. 2015AJ....150..173N 2015AJ....150..173N), and the spectroscopic parameters
used for the stars in our sample are derived from the Automated Stellar
Parameters and Chemical Abundances Pipeline (ASPCAP). ASPCAP consists
of two principal components: a FORTRAN90 optimization code (FERRE;
Allende Prieto et al. 2006ApJ...636..804A 2006ApJ...636..804A) that compares the observed
APOGEE spectra to synthetic libraries, and a multifunctional IDL wrapper
used for bookkeeping and reading and preparing the input APOGEE spectra.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 90 205 Spectral Synthesis Study Comparison Parameters
table2.dat 86 24 Equivalent Width Study Comparison Parameters
table3.dat 126 281 Parameters of Selected Sample
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars
(Santos+, 2004)
J/A+A/545/A32 : Chemical abundances of 1111 FGK stars (Adibekyan+, 2012)
J/MNRAS/423/122 : Abundances of 93 solar-type Kepler targets
(Bruntt+, 2012)
J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)
J/ApJ/767/127 : Asteroseismic solutions for 77 Kepler stars
(Huber+, 2013)
J/A+A/568/A25 : C and O abundances in stellar populations (Nissen+, 2014)
J/ApJ/815/5 : Detailed abundances of KOI stars with planets. I.
(Schuler+, 2015)
J/AJ/151/144 : ASPCAP weights for the 15 APOGEE chemical elements
(Garcia+, 2016)
J/AJ/152/187 : Planet occurrence and stellar metallicity for KOIs
(Mulders+, 2016)
J/ApJS/225/32 : Extended abundance analysis of cool stars (Brewer+, 2016)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- APOGEE APOGEE identifier (2MHHMMSSss+DDMMSSs)
20- 28 F9.4 K Teff [4643.3867/6586.2534] ASPCAP effective
temperature
30- 46 F17.11 [Sun] [Fe/H] [-1.1999342/0.4316364]?=-9999 ASPCAP
metallicity
48- 51 I4 K TeffBr12 [4710/6378]? Effective temperature from
Bruntt et al. 2012 (1)
53- 57 F5.2 [Sun] [Fe/H]Br12 [-0.99/0.34]? Metallicity from Bruntt et al.
2012 (1)
59- 62 I4 K TeffBu12 [5094/6892]? Effective temperature from
Bucchave et al. 2012 (1)
64- 68 F5.2 [Sun] [Fe/H]Bu12 [-0.59/0.41]? Metallicity from Bucchave et al.
2012 (1)
70- 73 I4 K TeffHu13 [4610/6350]? Effective temperature from
Huber et al. 2013 (1)
75- 79 F5.2 [Sun] [Fe/H]Hu13 [-0.51/0.4]? Metallicity from Huber et al. 2013
(1)
81- 84 I4 K TeffBr16 [4605/6350]? Effective temperature from
Brewer et al. 2016 (1)
86- 90 F5.2 [Sun] [Fe/H]Br16 [-0.94/0.44]? Metallicity from Brewer et al.
2016 (1)
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Note (1): References cited in explanations:
Bruntt et al. (2012, J/MNRAS/423/122);
Bucchave et al. (2012, J/other/Nat/486.375);
Huber et al. (2013, J/ApJ/767/127);
Brewer et al. (2016, J/ApJS/225/32).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- APOGEE APOGEE identifier (2MHHMMSSss+DDMMSSs)
20- 28 F9.4 K Teff [4780.9253/6301.9053] ASPCAP effective
temperature
30- 41 F12.9 [Sun] [Fe/H] [-1.3181967/0.13570656] ASPCAP metallicity
43- 46 I4 K TeffN14 [5572/6137]? Effective temperature from
Nissen et al. 2014 (1)
48- 52 F5.2 [Sun] [Fe/H]N14 [-1.41/-0.68]? Metallicity from Nissen et al.
2014 (1)
54- 57 I4 K TeffS15 [5406/6240]? Effective temperature from
Schuler et al. 2015 (1)
59- 64 F6.3 [Sun] [Fe/H]S15 [-0.323/0.126]? Metallicity from Schuler et al.
2015 (1)
66- 69 I4 K TeffG10 [4922/6237]? Effective temperature from
Ghezzi et al. 2010 (1)
71- 75 F5.2 [Sun] [Fe/H]G10 [-0.72/0.19]? Metallicity from Ghezzi et al.
2010 (1)
77- 80 I4 K TeffA12 [5090/5908]? Effective temperature from
Adibekyan et al. 2012 (1)
82- 86 F5.2 [Sun] [Fe/H]A12 [-0.82/-0.36]? Metallicity from Adibekyan et al.
2012 (1)
--------------------------------------------------------------------------------
Note (1): References cited in explanations:
Nissen et al. (2014, J/A+A/568/A25);
Schuler et al. (2015, J/ApJ/815/5);
Ghezzi et al. (2010ApJ...725..721G 2010ApJ...725..721G);
Adibekyan et al. (2012, J/A+A/545/A32).
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- KOI Kepler Object of Interest identifier
(KOI-NNNN.NN in Simbad)
11- 18 I8 --- KIC [1429589/10925104] Kepler Input Catalog
identifier (KIC NNNNNNNN in Simbad)
20- 31 F12.9 d Per [0.558841234/99.6442783] Orbital period
33- 41 E9.3 d E_Per [8.2e-08/0.00568] Upper uncertainty in Per
43- 51 E9.3 d e_Per [8.2e-08/0.00568] Lower uncertainty in Per
53- 57 F5.2 Rgeo Rp [0.48/16.91] Planet radius
59- 62 F4.2 Rgeo E_Rp [0.03/5.41] Upper uncertainty in Rp
64- 67 F4.2 Rgeo e_Rp [0.02/4.29] Lower uncertainty in Rp
69- 74 F6.3 mag Kpmag [9.582/15.987] Kepler apparent magnitude
76- 93 A18 --- APOGEE APOGEE identifier (2MHHMMSSss+DDMMSSs)
95-107 F13.8 K Teff Effective temperature
109-126 F18.15 [Sun] [Fe/H] Metallicity
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 05-Oct-2018