Simultaneous TESS and NGTS Transit Observations of WASP-166b
Abstract
We observed a transit of WASP-166 b using nine NGTS telescopes simultaneously with TESS observations of the same transit. We achieved a photometric precision of 152 ppm per 30 minutes with the nine NGTS telescopes combined, matching the precision reached by TESS for the transit event around this bright (T=8.87) star. The individual NGTS light curve noise is found to be dominated by scintillation noise and appears free from any time-correlated noise or any correlation between telescope systems. We fit the NGTS data for and . We find to be consistent to within 0.25 of the result from the TESS data, and the difference between the TESS and NGTS measured values is 0.9. This experiment shows that multi-telescope NGTS photometry can match the precision of TESS for bright stars, and will be a valuable tool in refining the radii and ephemerides for bright TESS candidates and planets. The transit timing achieved will also enable NGTS to measure significant transit timing variations in multi-planet systems.
Cite
@article{arxiv.2004.07589,
title = {Simultaneous TESS and NGTS Transit Observations of WASP-166b},
author = {Edward M. Bryant and Daniel Bayliss and James McCormac and Peter J. Wheatley and Jack S. Acton and David R. Anderson and David J. Armstrong and François Bouchy and Claudia Belardi and Matthew R. Burleigh and Rosie H. Tilbrook and Sarah L. Casewell and Benjamin F. Cooke and Samuel Gill and Michael R. Goad and James S. Jenkins and Monika Lendl and Don Pollacco and Didier Queloz and Liam Raynard and Alexis M. S. Smith and Jose I. Vines and Richard G. West and Stephane Udry},
journal= {arXiv preprint arXiv:2004.07589},
year = {2020}
}
Comments
10 pages, 8 figures. Accepted for publication in MNRAS