2012A&A...543A..63N


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST07:35:16

2012A&A...543A..63N - Astronomy and Astrophysics, volume 543A, 63-63 (2012/7-1)

Minimizing follow-up for space-based transit surveys using full lightcurve analysis.

NEFS S.V., SNELLEN I.A.G. and DE MOOIJ E.J.W.

Abstract (from CDS):

One of the biggest challenges facing large transit surveys is the elimination of false-positives from the vast number of transit candidates. A large amount of expensive follow-up time is spent on verifying the nature of these systems. We investigate to what extent information from the lightcurves can identify blend scenarios and eliminate them as planet candidates, to significantly decrease the amount of follow-up observing time required to identify the true exoplanet systems. If a lightcurve has a sufficiently high signal-to-noise ratio, a distinction can be made between the lightcurve of a stellar binary blended with a third star and the lightcurve of a transiting exoplanet system. We first simulate lightcurves of stellar blends and transiting planet systems to determine what signal-to-noise level is required to make the distinction between blended and non-blended systems as function of transit depth and impact parameter. Subsequently we test our method on real data from the first IRa01 field observed by the CoRoT satellite, concentrating on the 51 candidates already identified by the CoRoT team. Our simulations show that blend scenarios can be constrained for transiting systems at low impact parameters. At high impact parameter, blended and non-blended systems are indistinguishable from each other because they both produce V-shaped transits. About 70% of the planet candidates in the CoRoT IRa01 field are best fit with an impact parameter of b>0.85, while less than 15% are expected in this range considering random orbital inclinations. By applying a cut at b<0.85, meaning that ∼15% of the potential planet population would be missed, the candidate sample decreases from 41 to 11. The lightcurves of 6 of those are best fit with such low host star densities that the planet-to-star size ratii imply unrealistic planet radii of R>2RJup. Two of the five remaining systems, CoRoT1b and CoRoT4b, have been identified as planets by the CoRoT team, for which the lightcurves alone rule out blended light at 14% (2σ) and 31% (2σ). One system possesses a M-dwarf secondary, one a candidate Neptune. We show that in the first CoRoT field, IRa01, 85% of the planet candidates can be rejected from the lightcurves alone, if a cut in impact parameter of b<0.85 is applied, at the cost of a <15% loss in planet yield. We propose to use this method on the Kepler database to study the fraction of real planets and to potentially increase the efficiency of follow-up.

Abstract Copyright:

Journal keyword(s): planets and satellites: detection - planetary systems - planets and satellites: fundamental parameters

Simbad objects: 49

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Number of rows : 49

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 CoRoT 102584675 * 06 41 00.5386448018 -00 03 36.230630334   15.767 15.218 15.056   ~ 2 0
2 CoRoT-7b Pl 06 43 49.4690410679 -01 03 46.825797768           ~ 346 1
3 CoRoT 102729260 * 06 44 18.62 -01 29 04.8           G5V 3 0
4 UCAC2 31465548 EB* 06 44 50.8735580655 -00 42 53.337127135     16.158     G7V 5 0
5 CoRoT 102759638 EB? 06 45 00 -02 36.8     15.13     ~ 2 0
6 UCAC2 31291128 * 06 45 05.2316953296 -01 21 25.378375774     13.199   12.84 F0V 5 0
7 CoRoT 102777119 * 06 45 23.1466251510 -03 09 23.571205173       15.282   ~ 2 0
8 UCAC2 31291280 * 06 45 26.8757472951 -01 14 09.378834485     15.412   14.27 K2V 6 0
9 CoRoT 102780627 * 06 45 27.7578427058 -00 35 04.608721990   16.236 15.357 14.89   K0III 4 0
10 UCAC2 31465872 * 06 45 36.2855273646 -00 43 17.424062415     13.452   12.72 G0III 6 0
11 CoRoT 102787204 * 06 45 36.5102294248 -02 28 50.693263056     14.902 14.21   K4III 2 0
12 UCAC2 31124502 * 06 45 37.6883207255 -01 58 09.409900750     14.865   12.99 M0II 4 0
13 UCAC2 30813563 * 06 45 53.9026759128 -02 47 15.935031117   14.82 14.24 14.20 13.51 A5IV 4 0
14 CoRoT 102798429 * 06 45 54.2808123146 -01 42 22.753363670   17.73 16.101 15.522   K7V 3 0
15 UCAC3 176-46419 * 06 45 57.5937949321 -02 28 00.878861775         14.72 K2V 3 0
16 UCAC2 30967007 * 06 46 02.2128278976 -02 00 13.506126395     14.552   13.73 G3V 4 0
17 UCAC2 30967048 * 06 46 08.9824566514 -02 02 00.458971509     15.703   14.73 G8V 4 0
18 UCAC3 177-47251 * 06 46 10.2452588076 -01 42 23.725540664   14.45 13.94 13.93 13.24 A7V 4 0
19 UCAC2 30654904 * 06 46 15.2840319187 -03 05 19.599706140     13.228 13.34 12.88 A0III 5 0
20 CoRoT 102812861 * 06 46 21.8282599237 -01 22 19.050548098   17.087 15.962 15.661   F8V 2 0
21 UCAC3 174-48039 * 06 46 25.7948421676 -03 09 13.243599799     14.893   13.81 F2V 4 0
22 CoRoT 102819021 * 06 46 32.1512852398 -01 29 58.786663271   16.222 15.461 15.323   ~ 2 0
23 UCAC2 31291764 * 06 46 36.9257693092 -01 06 15.499633062     15.71   14.85 G2V 3 0
24 UCAC2 30813787 * 06 46 43.1347187958 -02 35 58.291504364     13.308   12.52 G4V 5 0
25 UCAC2 30655070 * 06 46 44.5869737165 -03 02 32.072033773     14.197   13.31 F5IV 4 0
26 UCAC2 31291827 * 06 46 49.3757316128 -01 23 11.554884570     13.933   13.07 K0IV 5 0
27 UCAC2 30813886 * 06 47 00.1273555955 -02 34 07.156183920     15.903   14.97 G0V 5 0
28 UCAC2 30813928 * 06 47 09.4069122646 -02 46 39.008635499     15.333     K5III 3 0
29 CoRoT 102842120 * 06 47 10.1503158682 -02 57 01.896560021   14.59 13.99 14.30   B5V 4 0
30 CoRoT 102842459 * 06 47 10.7074107543 -01 58 07.454705027   15.918 15.084 14.943   G8V 3 0
31 CoRoT 102850921 * 06 47 23.8631432770 -03 08 32.379682812   13.254 12.985 13.004   A6V 3 0
32 UCAC2 30814057 * 06 47 30.4984191599 -02 36 40.234427478     14.215     G0V 4 0
33 UCAC2 30814058 * 06 47 30.5829888151 -02 55 04.102872833     14.062     G0V 4 0
34 CoRoT 102856307 * 06 47 31.7072542432 -01 23 26.767072468   14.581 13.912 13.822   ~ 1 0
35 CoRoT 102863810 * 06 47 41.9436694227 -02 47 43.314596071   16.402 15.734 15.552   ~ 2 0
36 UCAC2 31466769 * 06 47 49.4709074137 -00 36 29.085081934     15.957   14.98 G9IV 3 0
37 UCAC2 31292265 * 06 48 00.1774401794 -01 05 06.020145467     15.099   13.62 K8V 3 0
38 CoRoT 102881832 * 06 48 07.5464259877 -00 47 09.076460410   16.047 15.273 15.353   ~ 2 0
39 CoRoT-1b Pl 06 48 19.1724141241 -03 06 07.710423478           ~ 150 1
40 CoRoT-1 * 06 48 19.1724141241 -03 06 07.710423478     13.6 13.44 12.88 G0V 106 2
41 CoRoT 102903238 * 06 48 35.4377970609 -02 00 11.669853839     16.214 15.925   K7V 3 0
42 CoRoT-4b Pl 06 48 46.7133639143 -00 40 21.969520601           ~ 57 1
43 CoRoT-4 * 06 48 46.7133639143 -00 40 21.969520601       13.42   F0V 57 1
44 CoRoT 102918586 EB* 06 48 54.3084 -00 52 22.875   12.74 12.32 12.34   A5IV 21 0
45 CoRoT 102926194 * 06 49 03.5447958112 -02 48 34.469409877   16.784 15.957 15.774   ~ 2 0
46 CoRoT 102932089 * 06 49 10.80 -01 58 10.5           ~ 2 0
47 UCAC3 176-48380 * 06 49 20.6358848340 -02 05 37.684553698     16.177     K2III 3 0
48 UCAC2 30814777 * 06 49 37.3330284540 -02 30 49.162034633     16.478   15.19 K5V 3 0
49 OGLE2-TR L9 * 11 07 55.1807238868 -61 08 46.537193777       14.60   F3 32 1

    Equat.    Gal    SGal    Ecl

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2020.07.05-07:35:16

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