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

[en] We present photometric observations of four transits in the WASP-17 planetary system, obtained using telescope defocusing techniques and with scatters reaching 0.5 mmag per point. Our revised orbital period is 4.0 ± 0.6 s 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, R[SUB]b[/SUB] = 1.932 ± 0.052 ± 0.010 R[SUB]Jup[/SUB] (statistical and systematic errors, respectively), provides confirmation that WASP-17 b is the largest planet currently known. All 14 planets with radii measured to be greater than 1.6 R[SUB]Jup[/SUB] are found around comparatively hot (T[SUB]eff[/SUB] > 5900 K) and massive (M[SUB]A[/SUB] > 1.15 M[SUB]&sun;[/SUB]) 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.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Southworth, John; Astrophysics Group, Keele University, Staffordshire, ST5 5BG

Hinse, T. C.; Korea Astronomy and Space Science Institute, Daejeon, 305-348 Republic of Korea

Dominik, M.; SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh St Andrews, KY16 9SS

Fang, X.-S.; National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, 650011 China

Harpsøe, K.; Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30 2100 Copenhagen Ø, Denmark ; Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, øster Voldgade 5-7 1350 Copenhagen K, Denmark

Jørgensen, U. G.; Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30 2100 Copenhagen Ø, Denmark ; Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, øster Voldgade 5-7 1350 Copenhagen K, Denmark

Kerins, E.; Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Road Manchester, M13 9PL

Liebig, C.; SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh St Andrews, KY16 9SS

Mancini, L.; Max Planck Institute for Astronomy, Königstuhl 17 69117 Heidelberg, Germany ; Istituto Internazionale per gli Alti Studi Scientifici (IIASS), 84019 Vietri Sul Mare (SA), Italy

Skottfelt, J.; Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30 2100 Copenhagen Ø, Denmark ; Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, øster Voldgade 5-7 1350 Copenhagen K, Denmark

More authors (22 more)

Language :

English

Title :

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

Publication date :

01 October 2012

Journal title :

Monthly Notices of the Royal Astronomical Society

ISSN :

0035-8711

eISSN :

1365-2966

Publisher :

Blackwell Publishing, Oxford, United Kingdom

Volume :

426

Pages :

1338-1348

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://esoads.eso.org/abs/2012MNRAS.426.1338S
http://de.arxiv.org/abs/1207.5797

Available on ORBi :

since 08 February 2013

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