Mislis, D and Mancini, L and Tregloan-Reed, J and Ciceri, S and Southworth, J and D'Ago, G and Bruni, I and Basturk, O and Alsubai, KA and Bachelet, E and Bramich, DM and Henning, T and Hinse, TC and Iannella, AL and Parley, N and Schroeder, T (2015) High-precision multiband time series photometry of exoplanets Qatar-1b and TrES-5b. Monthly Notices of the Royal Astronomical Society, 448 (3). 2617 -2623. ISSN 1365-2966

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Abstract

We present an analysis of the Qatar-1 and TrES-5 transiting exoplanetary systems, which contain Jupiter-like planets on short-period orbits around K-dwarf stars. Our data comprise a total of 20 transit light curves obtained using five medium-class telescopes, operated using the defocusing technique. The average precision we reach in all our data is RMSQ = 1.1 mmag for Qatar-1 (V = 12.8) and RMST = 1.0 mmag for TrES-5 (V = 13.7). We use these data to refine the orbital ephemeris, photometric parameters, and measured physical properties of the two systems. One transit event for each object was observed simultaneously in three passbands (gri) using the BUSCA imager. The QES survey light curve of Qatar-1 has a clear sinusoidal variation on a period of P⋆ = 23.697 ± 0.123 d, implying significant star-spot activity. We searched for star-spot crossing events in our light curves, but did not find clear evidence in any of the new data sets. The planet in the Qatar-1 system did not transit the active latitudes on the surfaces of its host star. Under the assumption that P⋆ corresponds to the rotation period of Qatar-1A, the rotational velocity of this star is very close to the vsin i⋆ value found from observations of the Rossiter–McLaughlin effect. The low projected orbital obliquity found in this system thus implies a low absolute orbital obliquity, which is also a necessary condition for the transit chord of the planet to avoid active latitudes on the stellar surface.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: techniques, photometric, planets and satellites, detection, planets and satellites, fundamental parameters, planetary systems
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 21 Sep 2015 13:52
Last Modified: 19 Oct 2017 12:53
URI: http://eprints.keele.ac.uk/id/eprint/929

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