2012MNRAS.426.1338S

Query : 2012MNRAS.426.1338S

2012MNRAS.426.1338S - Mon. Not. R. Astron. Soc., 426, 1338-1348 (2012/October-3)

High-precision photometry by telescope defocusing - IV. Confirmation of the huge radius of WASP-17b.

SOUTHWORTH J., HINSE T.C., DOMINIK M., FANG X.-S., HARPSOE K., JORGENSEN U.G., KERINS E., LIEBIG C., MANCINI L., SKOTTFELT J., ANDERSON D.R., SMALLEY B., TREGLOAN-REED J., WERTZ O., ALSUBAI K.A., BOZZA V., CALCHI NOVATI S., DREIZLER S., GU S.-H., HUNDERTMARK M., JESSEN-HANSEN J., KAINS N., KJELDSEN H., LUND M.N., LUNDKVIST M., MATHIASEN M., PENNY M.T., RAHVAR S., RICCI D., SCARPETTA G., SNODGRASS C. and SURDEJ J.

Abstract (from CDS):

We present photometric observations of four transits in the WASP-17 planetary system, obtained using telescope defocusing techniques and with scatters reaching 0.5mmag per point. Our revised orbital period is 4.0 ± 0.6s longer than previous measurements, a difference of 6.6σ, and does not support the published detections of orbital eccentricity in this system. We model the light curves using the JKTEBOP code and calculate the physical properties of the system by recourse to five sets of theoretical stellar model predictions. The resulting planetary radius, Rb= 1.932 ±0.052±0.010RJup(statistical and systematic errors, respectively), provides confirmation that WASP-17b is the largest planet currently known. All 14 planets with radii measured to be greater than 1.6RJupare found around comparatively hot (Teff> 5900K) and massive (MA > 1.15M☉) stars. Chromospheric activity indicators are available for eight of these stars, and all imply a low activity level. The planets have small or zero orbital eccentricities, so tidal effects struggle to explain their large radii. The observed dearth of large planets around small stars may be natural but could also be due to observational biases against deep transits, if these are mistakenly labelled as false positives and so not followed up.

Based on data collected by MiNDSTEp with the Danish 1.54-m telescope at the ESO La Silla Observatory.

Royal Society University Research Fellow.


Abstract Copyright: © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS

Journal keyword(s): stars: fundamental parameters - stars: individual: WASP-17 - planetary systems

VizieR on-line data: <Available at CDS (J/MNRAS/426/1338): wasp17.dat>

Simbad objects: 26

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Number of rows : 26
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 HD 10069b Pl 01 37 25.0332798696 -45 40 40.374717456           ~ 375 1
2 HAT-P-32 * 02 04 10.2774374568 +46 41 16.212315084   11.79 11.44 11.23   ~ 74 1
3 HAT-P-32b Pl 02 04 10.2774374568 +46 41 16.212315084           ~ 159 1
4 HD 15082b Pl 02 26 51.0582618096 +37 33 01.736482032           ~ 341 1
5 WASP-78 * 04 15 01.5042985272 -22 06 59.103350532   12.65 11.96 12.43 11.65 F8 46 1
6 CD-30 1812 * 04 25 29.0166589296 -30 36 01.610731368   10.45 10.04     F5 55 1
7 WASP-12 * 06 30 32.7966092352 +29 40 20.263502460   12.14 11.57     G0V 312 1
8 CoRoT-7 * 06 43 49.4690164104 -01 03 46.826642700   12.78 11.73 11.36 10.87 K0V 213 1
9 CoRoT-7b Pl 06 43 49.4690164104 -01 03 46.826642700           ~ 402 1
10 HAT-P-33 * 07 32 44.2173520776 +33 50 06.115051104   11.66 11.03 11.10   F4 40 1
11 * rho01 Cnc e Pl 08 52 35.8111044043 +28 19 50.954994470           ~ 581 1
12 HD 80606b Pl 09 22 37.5768032712 +50 36 13.435326684           ~ 328 1
13 OGLE2-TR L9 * 11 07 55.1808382920 -61 08 46.537684260       14.60   F3 35 1
14 BD+22 2716 * 14 33 06.3571702344 +21 53 40.981395876   10.194 9.745     F5V 101 1
15 CD-27 10695b Pl 15 59 50.9491505016 -28 03 42.312819096           ~ 261 1
16 CD-27 10695 * 15 59 50.9491505016 -28 03 42.312819096   11.83 11.59 11.31 10.92 F4 122 1
17 OGLE-TR 10 EB* 17 51 28.2593510544 -29 52 35.231024064     15.780 16.193 14.92 G2V 91 1
18 TrES-4 Pl 17 53 13.0489562760 +37 12 42.586493328           ~ 217 2
19 OGLE-TR 56 SB* 17 56 35.5016678064 -29 32 21.479240220     16.560 16.07 15.30 ~ 170 1
20 Kepler-12 Er* 19 04 58.4220633696 +50 02 25.271762064   13.96   13.68   G0 87 1
21 Kepler-7 Er* 19 14 19.5623105760 +41 05 23.367379128           G0 115 1
22 Kepler-16 SB* 19 16 18.1758378936 +51 45 26.782726104   12.1   11.90   K7V 245 1
23 WASP-48 * 19 24 38.9614451424 +55 28 23.332107108   12.31 11.65 11.61   ~ 51 1
24 Kepler-11 Er* 19 48 27.6226218768 +41 54 32.903163504   14.635 13.838 13.742   G2V 354 1
25 HAT-P-41 * 19 49 17.4398486136 +04 40 20.786070360   11.65 11.36     ~ 44 1
26 HAT-P-40 * 22 22 03.0875673648 +45 27 26.518064616   12.19 11.34     ~ 28 1

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