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NGTS-2b: an inflated hot-Jupiter transiting a bright F-dwarf

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posted on 2019-06-25, 12:31 authored by L Raynard, MR Goad, E Gillen, LD Nielsen, CA Watson, APG Thompson, J McCormac, D Bayliss, M Soto, S Csizmadia, A Chaushev, MR Burleigh, R Alexander, DJ Armstrong, F Bouchy, JT Briegal, J Cabrera, SL Casewell, B Chazelas, BF Cooke, P Eigmueller, A Erikson, BT Gansicke, A Grange, MN Guenther, ST Hodgkin, MJ Hooton, JS Jenkins, G Lambert, T Louden, L Metrailler, M Moyano, D Pollacco, K Poppenhaeger, D Queloz, R Raddi, H Rauer, AM Read, B Smalley, AMS Smith, O Turner, S Udry, SR Walker, RG West, PJ Wheatley
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 −0.12 MJ, radius 1.595+0.047 −0.045 RJ, 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.

Funding

This publication is based on data collected under the NGTS project at the ESO La Silla Paranal Observatory. The NGTS instrument and operations are funded by the consortium institutes and by the UK Science and Technology Facilities Council (STFC; project reference ST/M001962/1). LR is supported by an STFC studentship (1795021). The contributions at the University of Leicester by MRG and MRB have been supported by STFC through consolidated grant ST/N000757/1. SLC acknowledges support from LISEO at the University of Leicester. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 681601). The contributions at the University of Warwick by PJW, RGW, DJA, DP, and TL are supported by an STFC consolidated grant (ST/P000495/1). JSJ acknowledges support by FONDECYT grant 1161218 and partial support by CATA-Basal (PB06, CONICYT). MNG is supported by the UK STFC award reference 1490409 as well as the Isaac Newton Studentship. Contributions at the University of Geneva by FB, BC, LM, and SU were carried out within the framework of the National Centre for Competence in Research ‘PlanetS’ supported by the Swiss National Science Foundation (SNSF). CAW acknowledges support from the STFC grant ST/P000312/1. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program.

History

Citation

Monthly Notices of the Royal Astronomical Society, 2018, 481 (4), pp. 4960-4970 (11)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Oxford University Press (OUP), Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Acceptance date

2018-09-17

Copyright date

2018

Available date

2019-06-25

Publisher version

https://academic.oup.com/mnras/article/481/4/4960/5104393

Notes

Supplementary data are available at MNRAS online. Table 1. NGTS photometry for NGTS-2.

Language

en