Article (Scientific journals)
High-precision photometry by telescope defocusing - VII. The ultrashort period planet WASP-103
Southworth, J.; Mancini, L.; Ciceri, S. et al.
2014In Monthly Notices of the Royal Astronomical Society, 447 (1), p. 711-721
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Keywords :
Planetary systems; Stars: fundamental parameters; Stars: individual: WASP-103
Abstract :
[en] We present 17 transit light curves of the ultrashort period planetary system WASP-103, a strong candidate for the detection of tidally-induced orbital decay. We use these to establish a high-precision reference epoch for transit timing studies. The time of the reference transit mid-point is now measured to an accuracy of 4.8 s, versus 67.4 s in the discovery paper, aiding future searches for orbital decay. With the help of published spectroscopic measurements and theoretical stellar models, we determine the physical properties of the system to high precision and present a detailed error budget for these calculations. The planet has a Roche lobe filling factor of 0.58, leading to a significant asphericity; we correct its measured mass and mean density for this phenomenon. A high-resolution Lucky Imaging observation shows no evidence for faint stars close enough to contaminate the point spread function of WASP-103. Our data were obtained in the Bessell RI and the SDSS griz passbands and yield a larger planet radius at bluer optical wavelengths, to a confidence level of 7.3σ. Interpreting this as an effect of Rayleigh scattering in the planetary atmosphere leads to a measurement of the planetary mass which is too small by a factor of 5, implying that Rayleigh scattering is not the main cause of the variation of radius with wavelength. © 2014 The Authors.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Southworth, J.;  Astrophysics Group, Keele University, Staffordshire, United Kingdom
Mancini, L.;  Max Planck Institute for Astronomy, konigstuhl 17, Heidelberg, Germany
Ciceri, S.;  Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT, Australia
Budaj, J.;  Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT, Australia, Astronomical Institute of the Slovak Academy of Sciences, 059 60, Tatranská Lomnica, Slovakia
Dominik, M.;  SUPA, University of St Andrews, School of Physics and Astronomy, North Haugh, St Andrews, Fife, United Kingdom
Figuera Jaimes, R.;  SUPA, University of St Andrews, School of Physics and Astronomy, North Haugh, St Andrews, Fife, United Kingdom, European Southern Observatory, Karl-Schwarzschild-Straße 2, Garching bei Munchen, Germany
Haugbølle, T.;  Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Øster Voldgade 5-7, Denmark
Jørgensen, U. G.;  Niels Bohr Institute and Centre for Star and Planet Formation, University of Copenhagen, Juliane Maries vej 30, Copenhagen, Denmark
Popovas, A.;  Niels Bohr Institute and Centre for Star and Planet Formation, University of Copenhagen, Juliane Maries vej 30, Copenhagen, Denmark
Rabus, M.;  Max Planck Institute for Astronomy, konigstuhl 17, Heidelberg, Germany, Instituto de Astrofisica, Facultad de Fisica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul Santiago, Chile
Rahvar, S.;  Department of Physics, Sharif University of Technology, PO Box 11155-9161, Tehran, Iran
Von Essen, C.;  Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, Aarhus, Denmark
Schmidt, R. W.;  Astronomisches Rechen-Institut, Universität Heidelberg, Mönchhofstraße 12-14, Heidelberg, Germany
Wertz, Olivier ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Alsubai, K. A.;  Qatar Environment and Energy Research Institute, Qatar Foundation, Tornado Tower, Floor 19, PO Box 5825, Doha, Qatar
Bozza, V.;  Dipartimento di Fisica 'E.R. Caianiello', Università di Salerno, Via Giovanni Paolo II 132, Fisciano, Italy, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
Bramich, D. M.;  Qatar Environment and Energy Research Institute, Qatar Foundation, Tornado Tower, Floor 19, PO Box 5825, Doha, Qatar
Calchi Novati, S.;  Dipartimento di Fisica 'E.R. Caianiello', Università di Salerno, Via Giovanni Paolo II 132, Fisciano, Italy, NASA Exoplanet Science Institute, California Institute of Technology, MS 100-22, Pasadena, CA, United States, Istituto Internazionale per gli Alti Studi Scientifici (IIASS), Vietri Sul Mare, Italy
D'Ago, G.;  Dipartimento di Fisica 'E.R. Caianiello', Università di Salerno, Via Giovanni Paolo II 132, Fisciano, Italy, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
Hinse, T. C.;  Korea Astronomy and Space Science Institute, Daejeon, South Korea
Henning, T.;  Max Planck Institute for Astronomy, konigstuhl 17, Heidelberg, Germany
Hundertmark, M.;  SUPA, University of St Andrews, School of Physics and Astronomy, North Haugh, St Andrews, Fife, United Kingdom
Juncher, D.;  Niels Bohr Institute and Centre for Star and Planet Formation, University of Copenhagen, Juliane Maries vej 30, Copenhagen, Denmark
Korhonen, H.;  Niels Bohr Institute and Centre for Star and Planet Formation, University of Copenhagen, Juliane Maries vej 30, Copenhagen, Denmark, Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Väisäläntie 20, Piikkïo, Finland
Skottfelt, J.;  Niels Bohr Institute and Centre for Star and Planet Formation, University of Copenhagen, Juliane Maries vej 30, Copenhagen, Denmark
Snodgrass, C.;  Planetary and Space Sciences, Department of Physical Sciences, Open University, Milton Keynes, United Kingdom
Starkey, D.;  SUPA, University of St Andrews, School of Physics and Astronomy, North Haugh, St Andrews, Fife, United Kingdom
Surdej, Jean  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
More authors (18 more) Less
Language :
English
Title :
High-precision photometry by telescope defocusing - VII. The ultrashort period planet WASP-103
Publication date :
2014
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Oxford University Press
Volume :
447
Issue :
1
Pages :
711-721
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 05 July 2015

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