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

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Date
11/02/2015
Author
Southworth, John
Mancini, L.
Ciceri, S.
Budaj, J.
Dominik, Martin
Figuera Jaimes, Roberto Jose
Haugbølle, T.
Jørgensen, U. G.
Popovas, A.
Rabus, M.
Rahvar, S.
von Essen, C.
Schmidt, R. W.
Wertz, O.
Alsubai, K. A.
Bozza, V.
Bramich, D. M.
Calchi Novati, S.
D'Ago, G.
Hinse, T. C.
Henning, Th.
Hundertmark, Markus Peter Gerhard
Juncher, D.
Korhonen, H.
Skottfelt, J.
Snodgrass, C.
Starkey, David
Surdej, J.
Funder
The Royal Society
Grant ID
UF100010 / UF130581
Keywords
Stars: fundamental parameters
Stars: individual: WASP-103
Planetary systems
QB Astronomy
QC Physics
DAS
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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.
Citation
Southworth , J , Mancini , L , Ciceri , S , Budaj , J , Dominik , M , Figuera Jaimes , R J , Haugbølle , T , Jørgensen , U G , Popovas , A , Rabus , M , Rahvar , S , von Essen , C , Schmidt , R W , Wertz , O , Alsubai , K A , Bozza , V , Bramich , D M , Calchi Novati , S , D'Ago , G , Hinse , T C , Henning , T , Hundertmark , M P G , Juncher , D , Korhonen , H , Skottfelt , J , Snodgrass , C , Starkey , D & Surdej , J 2015 , ' 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
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stu2394
ISSN
0035-8711
Type
Journal article
Rights
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
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  • University of St Andrews Research
URL
http://adsabs.harvard.edu/abs/2015MNRAS.447..711S
http://mnras.oxfordjournals.org/content/447/1/711/suppl/DC1
URI
http://hdl.handle.net/10023/6148

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