NGTS-39 b: A 58 d transiting warm Jupiter in an eccentric orbit

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ID: 319711
2026
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Abstract
Abstract We report the discovery and characterisation of NGTS-39 b (TIC 453147896 b), a warm Jupiter transiting a Sun-like star on a 58.2 day, eccentric (e = 0.386 ± 0.019) orbit. NGTS-39 b was first identified from a TESS single transit event, and subsequently confirmed with NGTS photometry and radial velocity measurements from CORALIE and HARPS. The host star is a bright (Tmag = 11.02) F9 dwarf with effective temperature of Teff = $6053_{-30}^{+67}$ K. NGTS-39 b is a Jupiter-sized gas giant with a radius of 1.088 ± 0.012 RJ and a mass of 1.467 ± 0.081 MJ. Its equilibrium temperature is $519_{-5}^{+6}$ K, placing it between short-period hot Jupiters and cold, Jupiter-like giants. The high orbital eccentricity and intermediate equilibrium temperature of NGTS-39 b make it a valuable test case for formation and migration models, particularly in the poorly sampled regime of long-period gas giants. The RV data show a linear trend of $\dot{\gamma } = -17.75$ m s−1 yr−1, which indicates the presence of an outer companion. The discovery of NGTS-39 b contributes to the small but growing population of transiting warm Jupiters with P>50 days orbiting bright stars.
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Authors Ioannis Apergis, Daniel Bayliss, Soléne Ulmer-Moll, S Gill, Toby Rodel, Matthew P. Battley, Paul Benni, Allyson Bieryla, James A. Blake, A. Bonfanti, François Bouchy, Edward M. Bryant, M. R. Burleigh, Samuel Carlier, S. L. Casewell, Hritam Chakraborty, Alastair B Claringbold, Karen A Collins, Benjamin D. R. Davies, X. Dumusque, Troy A Edkins, Fintan Eeles-Nolle, J A Egger, Jorge Fernández Fernández, Marcelo Aron Fetzner Keniger, Pedro Figueira, M R Goad, G. M. Harvey, Faith Hawthorn, Mélissa J. Hobson, Mathilde Houelle, Giovanni Isopi, Timour Jestin, Alicia Kendall, M. Lendl, D. J. Lewis, Isobel S Lockley, F. Mallia, J McCormac, M. Mitchell, L. Mignon, H P Osborn, Angelica Psaridi, Alex Romanec, Suman Saha, Amber Sedgley, S. G. Sousa, Neil Thomas, Stéphane Udry, Christopher Watson, R. G. West, T. G. Wilson, P. J. Wheatley, Jack Williams, Aldo Zapparata, Krzysztof Sz Zieliński
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1271
URL
https://doi.org/10.1093/mnras/stag1271
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