2012A&A...547A..36A

Query : 2012A&A...547A..36A

2012A&A...547A..36A - Astronomy and Astrophysics, volume 547A, 36-36 (2012/11-1)

Exploring the α-enhancement of metal-poor planet-hosting stars. The Kepler and HARPS samples.

ADIBEKYAN V.Zh., DELGADO MENA E., SOUSA S.G., SANTOS N.C., ISRAELIAN G., GONZALEZ HERNANDEZ J.I., MAYOR M. and HAKOBYAN A.A.

Abstract (from CDS):

Recent studies have shown that at low metallicities Doppler-detected planet-hosting stars tend to have high α-content and to belong to the thick disk. We used the reconnaissance spectra of 87 Kepler planet candidates and data available from the HARPS planet search survey to explore this phenomenon. Using the traditional spectroscopic abundance analysis methods, we derived Ti, Ca, and Cr abundances for the Kepler stars. In the metallicity region -0.65<[Fe/H]←0.3dex, the fraction of Ti-enhanced thick-disk HARPS planet harboring stars is 12.3±4.1%, and for their thin-disk counterparts this fraction is 2.2±1.3%. Binomial statistics give a probability of 0.008 that this could have occurred by chance. Combining the two samples (HARPS and Kepler) reinforces the significance of this result (P∼99.97 %). Since most of these stars harbor small sized or low-mass planets we can assume that, although terrestrial planets can be found in a low-iron regime, they are mostly enhanced by α-elements. This implies that early formation of rocky planets could start in the Galactic thick disk, where the chemical conditions for their formation are more favorable.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - planetary systems

VizieR on-line data: <Available at CDS (J/A+A/547/A36): table.dat>

Simbad objects: 87

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Number of rows : 87
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 Kepler-94 Er* 18 44 46.7440377288 +47 29 49.749482616   14.438 13.184 12.825   M0V 67 0
2 KOI-263 Ro* 18 45 05.7919625976 +47 46 27.922365300   11.57 10.82     G0V 48 0
3 Kepler-102 Er* 18 45 55.8559851072 +47 12 28.845259020   12.58 12.07 11.510   K3V 110 0
4 Kepler-780 Er* 18 47 03.9381963096 +44 17 33.134333460   14.221 13.456 13.316   G5 41 0
5 Kepler-139 Er* 18 49 34.0590031152 +43 53 21.647525460   12.569 12.031 12.651   G8IV-V 60 0
6 Kepler-128 Er* 18 49 58.1342142288 +43 58 48.694489320   11.984 11.380 11.280   F2 84 0
7 Kepler-422 Er* 18 50 31.1172439656 +46 19 23.993631336           G2V 69 0
8 Kepler-62 Er* 18 52 51.0518497680 +45 20 59.399622996   14.702 13.982 13.807   G5 130 1
9 Kepler-132 Er* 18 52 56.5641599064 +41 20 34.997513460   12.49 11.92 11.768   G1 87 0
10 Kepler-101 Er* 18 53 01.3205511624 +48 21 18.784380528   14.474 13.729 13.574   G4 49 0
11 Kepler-421 Ro* 18 53 01.6404687912 +45 05 15.976733388           G7 36 0
12 BD+44 3020 PM* 18 56 14.3076037320 +44 31 05.389610412   10.45 9.77     G8V 124 1
13 Kepler-484 Er* 18 57 34.6390326600 +46 14 56.836942368   14.020 13.217 12.996   G5 53 0
14 Kepler-1656 Er* 18 57 53.3246033136 +39 54 42.531984144   12.016 11.252 11.096   ~ 54 0
15 Kepler-95 Er* 18 57 55.7883819888 +44 23 52.818842400   13.313 12.481 12.268   G5V 83 0
16 Kepler-127 Er* 19 00 45.5887144320 +46 01 40.693626120   12.231 11.627 11.415   G0 73 0
17 Kepler-43 EB* 19 00 57.8034040200 +46 40 05.665887660   13.8   14.16   G0 82 1
18 Kepler-129 Er* 19 01 14.7043468776 +47 50 54.901789800   12.67 11.81 11.603   G4V 80 0
19 Kepler-9 Er* 19 02 17.7544327200 +38 24 03.176851896     13.9 13.791   G2 190 1
20 Kepler-4 Er* 19 02 27.6979514832 +50 08 08.703945600   13.114 12.293 12.195   G0 104 1
21 Kepler-98 Er* 19 02 38.7947770872 +37 57 52.200110880       12.874   G7 54 0
22 Kepler-10 Ro* 19 02 43.0613892904 +50 14 28.701617339       11.00   G2V 202 1
23 Kepler-12 Er* 19 04 58.4220633696 +50 02 25.271762064   13.96   13.68   G0 84 1
24 Kepler-277 Er* 19 06 19.9577165304 +39 04 37.861617108       13.491   ~ 52 0
25 Kepler-473 Er* 19 06 31.2218679768 +38 56 44.079004068       13.408   ~ 41 0
26 Kepler-1 EB* 19 07 14.0375836512 +49 18 59.091482160   11.85 11.25     G0V 176 2
27 Kepler-491 EB* 19 08 31.3446274272 +42 21 00.609790608           K1 56 0
28 Kepler-97 Er* 19 09 18.3874144296 +48 40 24.368309184   13.632 12.956 12.876   G0V 61 0
29 Kepler-454 Er* 19 09 54.8465617704 +38 13 43.922389152   12.38 11.57 11.467   ~ 70 0
30 Kepler-104 EB* 19 10 25.1128815288 +42 10 00.255205236   13.12 12.73 12.61   G0V 82 0
31 Kepler-20 Er* 19 10 47.5233433920 +42 20 19.301370684   13.278 12.630 12.478 11.64 G5V 167 1
32 Kepler-113 Er* 19 11 59.4990081336 +50 56 39.668230356   14.990 13.718 13.477   K4 61 0
33 KOI-141 Er* 19 12 09.190104 +50 39 05.79024   14.86 13.82 13.76   G8V 43 0
34 Kepler-131 Er* 19 14 07.4053097208 +40 56 32.328971700   12.379 11.677 11.516   G2V 75 0
35 Kepler-858 Er* 19 15 23.6724855936 +51 12 32.574855816   13.151 12.557 12.413   G6 41 0
36 Kepler-103 Er* 19 15 56.2939334304 +40 03 52.285818168   13.136 12.360 12.254   G5Ib 89 0
37 Kepler-92 Er* 19 16 20.6546892216 +41 33 46.654315236   12.460 11.849 11.777   G0IV 82 0
38 Kepler-22 Er* 19 16 52.1902276920 +47 53 03.948648180   12.597 11.813 11.642   G5 91 1
39 Kepler-63 Er* 19 16 54.2861367672 +49 32 53.451062520   12.449 11.733 11.701   G5 114 1
40 Kepler-629 Ro* 19 17 40.2822295800 +39 56 42.109584720           K0V 44 0
41 Kepler-77 Ro* 19 18 25.9101027984 +44 20 43.571253840   15.03 14.10 13.91   G5V 68 1
42 Kepler-109 Er* 19 21 34.2534438336 +40 17 05.498443284   13.162 12.388 12.320   G4V 79 0
43 Kepler-19 Er* 19 21 40.9995019176 +37 51 06.437281140   12.88 12.04 11.888   F9 88 1
44 Kepler-540 Er* 19 22 30.0570200304 +44 52 26.212595772   13.097 12.298 12.204   G0V 47 0
45 Kepler-746 Ro* 19 22 43.7375439192 +37 21 18.481728492           ~ 30 0
46 BD+48 2893 Er* 19 24 07.7659706688 +49 02 24.928348272   10.73 10.08 9.914   G1V 135 1
47 Kepler-1973 ** 19 24 11.698320 +36 50 23.55432   12.78 11.88 11.56   K1V 50 0
48 Kepler-1704 Ro* 19 24 48.2988338352 +51 08 39.405102360           ~ 31 0
49 Kepler-100 Er* 19 25 32.6432787456 +41 59 24.945100548   12.009 11.278 11.128   G3 110 0
50 BD+38 3583 Er* 19 25 40.3885404552 +38 40 20.413186860   10.73 10.00 9.853   G5V 117 0
51 Kepler-889 Ro* 19 25 52.1612016840 +50 45 34.126557300           ~ 34 0
52 Kepler-111 Er* 19 26 36.7607353488 +44 41 17.797093512   14.341 13.619 13.459   F8V 57 0
53 Kepler-1710 Er* 19 26 44.0068884672 +37 45 05.633147376   13.470 12.729 12.583   ~ 61 0
54 Kepler-406 Er* 19 27 23.5375431360 +44 58 05.726111052   13.401 12.672 12.482   G5IV 66 0
55 Kepler-625 Ro* 19 28 36.1086706536 +39 38 15.223322256           G0 44 0
56 Kepler-1718 Ro* 19 28 56.3781482304 +42 54 33.941301336           G0.5V 42 0
57 Kepler-248 Er* 19 32 14.7170498880 +43 34 52.879379772   16.198 15.358 15.351 14.48 ~ 53 1
58 Kepler-464 Er* 19 39 20.4361754256 +48 58 56.492869800   13.514 12.783 12.653   G3 49 0
59 Kepler-142 Er* 19 40 28.5407018232 +48 28 52.654331856   14.101 13.318 13.177   ~ 60 0
60 KOI-682 Ro* 19 40 47.5204091808 +43 16 10.203172716           G8IV-V 35 0
61 Kepler-197 Er* 19 40 54.3398888544 +50 33 32.423445180   12.42 11.78 11.800   F5 84 0
62 KOI-99 Er* 19 41 44.2399502904 +44 31 51.893074776   14.191 12.875 12.985   ~ 37 0
63 Kepler-743 Er* 19 42 17.8029626112 +42 48 23.170260420   13.367 12.736 12.516   K0V 56 0
64 Kepler-466 Er* 19 42 35.6838266424 +48 29 43.984799880   13.620 12.909 12.703   ~ 49 0
65 Kepler-15 Ro* 19 44 48.1365025872 +49 08 24.297539028       14.03   G8IV-V 72 1
66 KOI-64 Er* 19 46 02.5373669448 +42 32 50.793426168   14.029   13.122   G5V 41 0
67 KOI-771 EB* 19 46 47.723952 +49 18 59.25528   15.97 15.17 15.10   ~ 31 0
68 Kepler-482 Er* 19 47 17.4848478816 +48 06 27.181735488   14.964 14.144 13.697   K3 45 0
69 Kepler-107 Er* 19 48 06.7734610824 +48 12 30.964175676   13.330 12.639 12.448   ~ 92 0
70 Kepler-96 EB* 19 48 16.7135669520 +40 31 30.523868868   11.130 10.436 10.233   G2V 80 0
71 Kepler-11 Er* 19 48 27.6226218768 +41 54 32.903163504   14.635 13.838 13.742   G2V 351 1
72 Kepler-632 Ro* 19 49 00.5998598352 +40 17 18.555023580   14.45 13.57 13.31   G5 39 0
73 Kepler-89 Ro* 19 49 19.9343204784 +41 53 28.006017936           ~ 148 1
74 Kepler-99 Er* 19 49 24.9577803120 +41 18 00.214368480       12.955   K4 60 0
75 Kepler-538 Er* 19 49 56.8506739776 +49 37 24.358625580   12.070 11.343 11.185   G5V 60 0
76 KOI-340 EB* 19 50 39.5072834592 +47 48 05.002693416           ~ 36 0
77 BD+47 2936 EB* 19 50 50.2472976936 +48 04 51.101390496       8.8   K4V 300 2
78 KOI-683 Er* 19 51 17.8277312832 +43 15 30.147870708   14.561 13.883 13.757   G2V 39 0
79 Kepler-414 Er* 19 51 50.7704135328 +48 14 39.740146656   14.364 13.540 13.209   G8 52 0
80 Kepler-18 Er* 19 52 19.0688312520 +44 44 46.807928916   14.750 13.767 13.93   ~ 124 1
81 Kepler-1711 Er* 19 52 42.537816 +42 14 13.28928   13.876 13.317 13.179   ~ 39 0
82 Kepler-463 Er* 19 55 44.8890304512 +44 51 28.481709276   13.834 13.075 12.866   G0V 47 0
83 KOI-1411 Ro* 19 55 58.8298839240 +45 54 34.197085044           G8IV-V 32 0
84 Kepler-539 Er* 19 56 29.3871979920 +41 52 00.317369676   13.150 12.519 12.342   G2V 63 0
85 Kepler-48 Er* 19 56 33.4161659688 +40 56 56.496876216   14.253 13.331 13.054   K0V 100 1
86 Kepler-1990 Er* 19 58 49.1429654544 +44 26 08.706567408   13.26 11.95     ~ 46 0
87 Kepler-106 Er* 20 03 27.3499329384 +44 20 15.191981988   13.592 12.963 12.817   G1 78 0

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