High-precision photometry by telescope defocusing - VII. The ultrashort period planet WASP-103

John Southworth, L. Mancini, S. Ciceri, J. Budaj, M. Dominik, R. Figuera Jaimes, T. Haugbølle, U. G. Jørgensen, A. Popovas, M. Rabus, S. Rahvar, C. Von Essen, R. W. Schmidt, O. Wertz, Khalid Al-Subai, V. Bozza, D. M. Bramich, S. Calchi Novati, G. D'Ago, T. C. HinseTh Henning, M. Hundertmark, D. Juncher, H. Korhonen, J. Skottfelt, C. Snodgrass, D. Starkey, J. Surdej

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)711-721
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume447
Issue number1
DOIs
Publication statusPublished - 20 Nov 2014

Fingerprint

defocusing
transit
photometry
planets
planet
scattering
telescopes
Rayleigh scattering
wavelength
planetary atmosphere
time measurement
asphericity
planetary mass
orbitals
planetary atmospheres
stellar models
radii
planetary systems
physical property
decay

Keywords

  • Planetary systems
  • Stars: fundamental parameters
  • Stars: individual: WASP-103

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Southworth, J., Mancini, L., Ciceri, S., Budaj, J., Dominik, M., Figuera Jaimes, R., ... Surdej, J. (2014). High-precision photometry by telescope defocusing - VII. The ultrashort period planet WASP-103. Monthly Notices of the Royal Astronomical Society, 447(1), 711-721. https://doi.org/10.1093/mnras/stu2394

High-precision photometry by telescope defocusing - VII. The ultrashort period planet WASP-103. / Southworth, John; Mancini, L.; Ciceri, S.; Budaj, J.; Dominik, M.; Figuera Jaimes, R.; Haugbølle, T.; Jørgensen, U. G.; Popovas, A.; Rabus, M.; Rahvar, S.; Von Essen, C.; Schmidt, R. W.; Wertz, O.; Al-Subai, Khalid; Bozza, V.; Bramich, D. M.; Calchi Novati, S.; D'Ago, G.; Hinse, T. C.; Henning, Th; Hundertmark, M.; Juncher, D.; Korhonen, H.; Skottfelt, J.; Snodgrass, C.; Starkey, D.; Surdej, J.

In: Monthly Notices of the Royal Astronomical Society, Vol. 447, No. 1, 20.11.2014, p. 711-721.

Research output: Contribution to journalArticle

Southworth, J, Mancini, L, Ciceri, S, Budaj, J, Dominik, M, Figuera Jaimes, R, Haugbølle, T, Jørgensen, UG, Popovas, A, Rabus, M, Rahvar, S, Von Essen, C, Schmidt, RW, Wertz, O, Al-Subai, K, Bozza, V, Bramich, DM, Calchi Novati, S, D'Ago, G, Hinse, TC, Henning, T, Hundertmark, M, Juncher, D, Korhonen, H, Skottfelt, J, Snodgrass, C, Starkey, D & Surdej, J 2014, 'High-precision photometry by telescope defocusing - VII. The ultrashort period planet WASP-103', Monthly Notices of the Royal Astronomical Society, vol. 447, no. 1, pp. 711-721. https://doi.org/10.1093/mnras/stu2394
Southworth, John ; Mancini, L. ; Ciceri, S. ; Budaj, J. ; Dominik, M. ; Figuera Jaimes, R. ; Haugbølle, T. ; Jørgensen, U. G. ; Popovas, A. ; Rabus, M. ; Rahvar, S. ; Von Essen, C. ; Schmidt, R. W. ; Wertz, O. ; Al-Subai, Khalid ; Bozza, V. ; Bramich, D. M. ; Calchi Novati, S. ; D'Ago, G. ; Hinse, T. C. ; Henning, Th ; Hundertmark, M. ; Juncher, D. ; Korhonen, H. ; Skottfelt, J. ; Snodgrass, C. ; Starkey, D. ; Surdej, J. / High-precision photometry by telescope defocusing - VII. The ultrashort period planet WASP-103. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 447, No. 1. pp. 711-721.
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AU - Southworth, John

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AU - Ciceri, S.

AU - Budaj, J.

AU - Dominik, M.

AU - Figuera Jaimes, R.

AU - Haugbølle, T.

AU - Jørgensen, U. G.

AU - Popovas, A.

AU - Rabus, M.

AU - Rahvar, S.

AU - Von Essen, C.

AU - Schmidt, R. W.

AU - Wertz, O.

AU - Al-Subai, Khalid

AU - Bozza, V.

AU - Bramich, D. M.

AU - Calchi Novati, S.

AU - D'Ago, G.

AU - Hinse, T. C.

AU - Henning, Th

AU - Hundertmark, M.

AU - Juncher, D.

AU - Korhonen, H.

AU - Skottfelt, J.

AU - Snodgrass, C.

AU - Starkey, D.

AU - Surdej, J.

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