Transits and starspots in the WASP-6 planetary system

Tregloan-Reed, J.; Southworth, J.; Burgdorf, M.; Calchi Novati, S.; Dominik, M.; Finet, F.; Jørgensen, U. G.; Maier, G.; Mancini, L.; Prof, S.; Ricci, D.; Snodgrass, C.; Bozza, V.; Browne, P.; Dodds, P.; Gerner, T.; Harpsøe, K.; Hinse, T. C.; Hundertmark, M.; Kains, N.; Kerins, E.; Liebig, C.; Penny, M. T.; Rahvar, S.; Sahu, K.; Scarpetta, G.; Schäfer, S.; Schönebeck, F.; Skottfelt, J.; Surdej, Jean

doi:10.1093/mnras/stv730

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Transits and starspots in the WASP-6 planetary system

Tregloan-Reed, J.; Southworth, J.; Burgdorf, M. et al.

2015 • In Monthly Notices of the Royal Astronomical Society, 450 (2), p. 1760-1769

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https://hdl.handle.net/2268/218270

DOI
10.1093/mnras/stv730

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Keywords :

Planetary systems - starspots; Stars: fundamental parameters; Stars: individual: WASP-6; Techniques: photometric

Abstract :

[en] We present updates to PRISM, a photometric transit-starspot model, and GEMC, a hybrid optimization code combining MCMC and a genetic algorithm. We then present high-precision photometry of four transits in the WASP-6 planetary system, two of which contain a starspot anomaly. All four transits were modelled using PRISM and GEMC, and the physical properties of the system calculated. We find the mass and radius of the host star to be 0.836 ± 0.063 M<inf>⊙</inf> and 0.864 ± 0.024 R<inf>⊙</inf>, respectively. For the planet, we find a mass of 0.485 ± 0.027 M<inf>Jup</inf>, a radius of 1.230 ± 0.035 R<inf>Jup</inf> and a density of 0.244 ± 0.014 ρ<inf>Jup</inf>. These values are consistent with those found in the literature. In the likely hypothesis that the two spot anomalies are caused by the same starspot or starspot complex, we measure the stars rotation period and velocity to be 23.80 ± 0.15 d and 1.78 ± 0.20 km s-1, respectively, at a colatitude of 75.8°. We find that the sky-projected angle between the stellar spin axis and the planetary orbital axis is λ = 7.2° ± 3.7°, indicating axial alignment. Our results are consistent with and more precise than published spectroscopic measurements of the Rossiter-McLaughlin effect. These results suggest that WASP-6 b formed at amuch greater distance from its host star and suffered orbital decay through tidal interactions with the protoplanetary disc. © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Tregloan-Reed, J.; NASA Ames Research Center, Moffett Field, CA, United States, Astrophysics Group, Keele University, Staffordshire, United Kingdom

Southworth, J.; Astrophysics Group, Keele University, Staffordshire, United Kingdom

Burgdorf, M.; Universität Hamburg Meteorologisches Institut, Bundesstraße 55, Hamburg, Germany

Calchi Novati, S.; NASA Exoplanet Science Institute,MS 100-22, California Institute of Technology, Pasadena, CA, United States, Dipartimento di Fisica 'E.R. Caianiello', Università di Salerno, Via Giovanni Paolo II 132, Fisciano (SA), Italy, Istituto Internazionale per gli Alti Studi Scientifici (IIASS), Vietri Sul Mare (SA), Italy

Dominik, M.; SUPA, University of St Andrews, School of Physics and Astronomy, North Haugh, St Andrews, Fife, United Kingdom

Finet, F.; Institut d'Astrophysique et de Géophysique, Université de Liège, Liège, Belgium, Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital, Uttarakhand, India

Jørgensen, U. G.; Niels Bohr Institute, Centre for Star and Planet Formation, University of Copenhagen, Østervoldgade 5, Copenhagen K, Denmark

Maier, G.; Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstraße 12-14, Heidelberg, Germany

Mancini, L.; Max Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany

Prof, S.; Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstraße 12-14, Heidelberg, Germany

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Language :

English

Title :

Transits and starspots in the WASP-6 planetary system

Publication date :

2015

Journal title :

Monthly Notices of the Royal Astronomical Society

ISSN :

0035-8711

eISSN :

1365-2966

Publisher :

Oxford University Press

Volume :

450

Issue :

Pages :

1760-1769

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 15 January 2018

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