Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 481, Issue 4, Pages 4960-4970Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty2581
Keywords
planets and satellites: detection; planets and satellites: fundamental parameters
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Funding
- UK Science and Technology Facilities Council (STFC) [ST/M001962/1]
- STFC [1795021, ST/N000757/1, ST/P000495/1, ST/P000312/1]
- LISEO at the University of Leicester
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [681601]
- FONDECYT [1161218]
- CATA-Basal (PB06, CONICYT)
- UK STFC [1490409]
- Isaac Newton Studentship
- Swiss National Science Foundation (SNSF)
- National Aeronautics and Space Administration
- STFC [ST/P000312/1, ST/N000757/1, ST/M002004/1, ST/P000495/1, ST/M001962/1, ST/L001306/1, ST/N001524/1, 1795021, 2025424] Funding Source: UKRI
- Science and Technology Facilities Council [ST/N001524/1, ST/L001306/1] Funding Source: researchfish
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We report the discovery of NGTS-2b, an inflated hot-Jupiter transiting a bright F5V star (2MASS J14202949 - 3112074; T-eff = 6478(-89) K+94 ), discovered as part of the Next Generation Transit Survey (NGTS). The planet is in a P = 4.51 d orbit with mass 0.74(-0.12)(+ 0.13) M-J, radius 1.595(-0.045)(+ 0.047) R-J, 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 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.
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