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High-precision multiband time series photometry of exoplanets Qatar-1b and TrES-5b

Mislis, D.; Mancini, L.; Tregloan-Reed, J.; Ciceri, S.; Taylor, J.; D'Ago, G.; Bruni, I.; Baştürk, Ö.; Alsubai, K.A.; Bachelet, E.; Bramich, D.M.; Th. Henning; Hinse, T.C.; Iannella, A.L.; Parley, N.; Schroeder, T.

High-precision multiband time series photometry of exoplanets Qatar-1b and TrES-5b Thumbnail


Authors

D. Mislis

L. Mancini

J. Tregloan-Reed

S. Ciceri

G. D'Ago

I. Bruni

Ö. Baştürk

K.A. Alsubai

E. Bachelet

D.M. Bramich

Th. Henning

T.C. Hinse

A.L. Iannella

N. Parley

T. Schroeder



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.

Journal Article Type Article
Acceptance Date Jan 27, 2015
Online Publication Date Mar 4, 2015
Publication Date Apr 11, 2015
Publicly Available Date Mar 29, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 448
Issue 3
Pages 2617 -2623
DOI https://doi.org/10.1093/mnras/stv197
Keywords techniques, photometric, planets and satellites, detection, planets and satellites, fundamental parameters, planetary systems
Publisher URL http://dx.doi.org/10.1093/mnras/stv197

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