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

Raynard, Liam; Goad, Michael R.; Gillen, Edward; Nielsen, Louise D.; Watson, Christopher A.; Thompson, Andrew P. G.; McCormac, James; Bayliss, Daniel; Soto, Maritza; Csizmadia, Szilard; Chaushev, Alexander; Burleigh, Matthew R.; Alexander, Richard; Armstrong, David J.; Bouchy, Francois; Briegal, Joshua T.; Cabrera, Juan; Casewell, Sarah L.; Chazelas, Bruno; Cooke, Benjamin F.; Eigmueller, Philipp; Erikson, Anders; Gansicke, Boris T.; Grange, Andrew; Gunther, Maximilian N.; Hodgkin, Simon T.; Hooton, Matthew J.; Jenkins, James S.; Lambert, Gregory; Louden, Tom; Metrailler, Lionel; Moyano, Maximiliano; Pollacco, Don; Poppenhaeger, Katja; Queloz, Didier; Raddi, Roberto; Rauer, Heike; Read, Andrew M.; Smalley, Barry; Smith, Alexis M. S.; Turner, Oliver; Udry, Stephane; Walker, Simon. R.; West, Richard G.; Wheatley, Peter J.

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Liam Raynard

Michael R. Goad

Edward Gillen

Louise D. Nielsen

Christopher A. Watson

Andrew P. G. Thompson

James McCormac

Daniel Bayliss

Maritza Soto

Szilard Csizmadia

Alexander Chaushev

Matthew R. Burleigh

Richard Alexander

David J. Armstrong

Francois Bouchy

Joshua T. Briegal

Juan Cabrera

Sarah L. Casewell

Bruno Chazelas

Benjamin F. Cooke

Philipp Eigmueller

Anders Erikson

Boris T. Gansicke

Andrew Grange

Maximilian N. Gunther

Simon T. Hodgkin

Matthew J. Hooton

James S. Jenkins

Gregory Lambert

Tom Louden

Lionel Metrailler

Maximiliano Moyano

Don Pollacco

Katja Poppenhaeger

Didier Queloz

Roberto Raddi

Heike Rauer

Andrew M. Read

Alexis M. S. Smith

Oliver Turner

Stephane Udry

Simon. R. Walker

Richard G. West

Peter J. 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+0.13-0.12MJ, 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.


Raynard, L., Goad, M. R., Gillen, E., Nielsen, L. D., Watson, C. A., Thompson, A. P. G., …Wheatley, P. J. (2018). NGTS-2b: An inflated hot-Jupiter transiting a bright F-dwarf. Monthly Notices of the Royal Astronomical Society, 481(4), 4960-4970.

Journal Article Type Article
Acceptance Date Sep 17, 2018
Publication Date Dec 21, 2018
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Volume 481
Issue 4
Pages 4960-4970
Keywords techniques, photometric, stars:individual: NGTS-2, planetary systems
Publisher URL


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