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Raynard, L, Goad, MR, Gillen, E, Nielsen, LD, Watson, CA, Thompson, APG, McCormac, J, Bayliss, D, Soto, M, Csizmadia, S, Chaushev, A, Burleigh, MR, Alexander, R, Armstrong, DJ, Bouchy, F, Briegal, JT, Cabrera, J, Casewell, SL, Chazelas, B, Cooke, BF, Eigmüller, P, Erikson, A, Gänsicke, BT, Grange, A, Günther, MN, Hodgkin, ST, Hooton, MJ, Jenkins, JS, Lambert, G, Louden, T, Metrailler, L, Moyano, M, Pollacco, D, Poppenhaeger, K, Queloz, D, Raddi, R, Rauer, H, Read, AM, Smalley, B, Smith, AMS, Turner, O, Udry, S, Walker, SR, West, RG and Wheatley, PJ (2018) NGTS-2b: An inflated hot-Jupiter transiting a bright F-dwarf. Monthly Notices of the Royal Astronomical Society, 481 (4). pp. 4960-4970. ISSN 0035-8711

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Abstract

We report the discovery of NGTS-2b, an inflated hot-Jupiter transiting a bright F5V star (2MASS J14202949 − 3112074; Teff = 6478+94−89 K), discovered as part of the Next Generation Transit Survey (NGTS). The planet is in a P = 4.51 d orbit with mass 0.74+0.13−0.12MJ, radius 1.595+0.047−0.045RJ, and density 0.226+0.040−0.038 g cm−3; therefore one of the lowest density exoplanets currently known. With a relatively deep 1.0 per cent 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 (⁠v sin i = 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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: techniques, photometric, stars:individual: NGTS-2, planetary systems
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 28 Sep 2018 10:59
Last Modified: 18 Mar 2019 14:01
URI: https://eprints.keele.ac.uk/id/eprint/5380

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