2009A&A...508.1011R


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.28CET20:14:06

2009A&A...508.1011R - Astronomy and Astrophysics, volume 508, 1011-1020 (2009/12-3)

Transit timing analysis of the exoplanets TrES-1 and TrES-2.

RABUS M., DEEG H.J., ALONSO R., BELMONTE J.A. and ALMENARA J.M.

Abstract (from CDS):

The aim of this work is a detailed analysis of transit light curves from TrES-1 and TrES-2, obtained over a period of three to four years, in order to search for variabilities in observed mid-transit times and to set constraints on the presence of additional third bodies. Using the IAC 80cm telescope, we observed transits of TrES-1 and TrES-2 over several years. Based on these new data and previously published work, we studied the observed light curves and searched for variations in the difference between observed and calculated (based on a fixed ephemeris) transit times. To model possible transit timing variations, we used polynomials of different orders, simulated O-C diagrams corresponding to a perturbing third mass, and we used sinusoidal fits. For each model we calculated the χ2 residuals and the false alarm probability (FAP). For TrES-1, we can exclude planetary companions (>1M) in the 3:2 and 2:1 MMRs having high FAPs based on our transit observations from the ground. Likewise, a light time effect caused, e.g., by a 0.09 M mass star at a distance of 7.8 AU is possible. As for TrES-2, we find a better ephemeris of Tc=2453957.63512(28)+2.4706101(18)xEpoch and a good fit for a sine function with a period of 0.2days, compatible with a moon around TrES-2 and an amplitude of 57s, but it is not a uniquely low χ2 value that would indicate a clear signal. In both cases, TrES-1 and TrES-2, we are able to put upper constraints on the presence of additional perturbers masses. We also conclude that any sinusoidal variations that might be indicative of exomoons need to be confirmed with higher statistical significance by further observations, noting that TrES-2 is in the field-of-view of the Kepler Space Telescope.

Abstract Copyright:

Journal keyword(s): planetary systems - methods: N-body simulations - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/508/1011): tres1pho.dat tres2pho.dat>

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Ross 905 PM* 11 42 11.0933874353 +26 42 23.658083337   12.06 10.613 10.272 8.24 M3V 518 1
2 PSR B1257+12 Psr 13 00 03.1075 +12 40 55.155           ~ 481 1
3 V* CM Dra BY* 16 34 20.3299130309 +57 09 44.365524588   14.50 12.87 10.85 9.26 M4.5V 409 0
4 NAME V672 Lyr b Pl 19 04 09.8516024106 +36 37 57.445911611           ~ 312 1
5 Kepler-1b Pl 19 07 14.0379171930 +49 18 59.090895318           ~ 288 2
6 HD 189733 BY* 20 00 43.7130382888 +22 42 39.071811263 9.241 8.578 7.648 7.126 6.68 K2V 745 1
7 HD 209458 V* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 1009 1

    Equat.    Gal    SGal    Ecl

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