We report the discovery of NGTS-2b, an inflated hot-Jupiter transiting a bright F5V star (2MASS J14202949-3112074; Teff=6478−89+94 K), discovered as part of the Next Generation Transit Survey (NGTS). The planet is in a P=4.51 day orbit with mass 0.74−0.12+0.13 MJ, radius 1.595−0.045+0.047 RJ and density 0.226−0.038+0.040 g cm−3; therefore one of the lowest density exoplanets currently known. With a relatively deep 1.0% transit around a bright V=10.96 host star, NGTS-2b is a prime target for probing giant planet composition via atmospheric transmission spectroscopy. The rapid rotation (vsini=15.2±0.8 km s−1) also makes this system an excellent candidate for Rossiter-McLaughlin follow-up observations, to measure the sky-projected stellar obliquity. NGTS-2b was confirmed without the need for follow-up photometry, due to the high precision of the NGTS photometry.
@article{arxiv.1805.10449,
title = {NGTS-2b: An inflated hot-Jupiter transiting a bright F-dwarf},
author = {Liam Raynard and Michael R. Goad and Edward Gillen and Louise D. Nielsen and Christopher A. Watson and Andrew P. G. Thompson and James McCormac and Daniel Bayliss and Maritza Soto and Szilard Csizmadia and Alexander Chaushev and Matthew R. Burleigh and Richard Alexander and David J. Armstrong and François Bouchy and Joshua T. Briegal and Juan Cabrera and Sarah L. Casewell and Bruno Chazelas and Benjamin F. Cooke and Philipp Eigmüller and Anders Erikson and Boris T. Gänsicke and Andrew Grange and Maximilian N. Günther and Simon T. Hodgkin and Matthew J. Hooton and James S. Jenkins and Gregory Lambert and Tom Louden and Lionel Metrailler and Maximiliano Moyano and Don Pollacco and Katja Poppenhaeger and Didier Queloz and Roberto Raddi and Heike Rauer and Andrew M. Read and Barry Smalley and Alexis M. S. Smith and Oliver Turner and Stéphane Udry and Simon R. Walker and Richard G. West and Peter J. Wheatley},
journal= {arXiv preprint arXiv:1805.10449},
year = {2018}
}
Comments
12 pages, 8 figures, accepted for publication in MNRAS