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

Article Article scientifique Article NGTS-39 b: a 58 d transiting warm Jupiter in an eccentric orbit eng 2026-07-06 2026-07-03 author Apergis Ioannis 0009-0004-7473-4573 author Bayliss Daniel 0000-0001-6023-1335 author Ulmer-Moll Solène 0000-0003-2417-7006 943255 author Gill Samuel 0000-0002-4259-0155 author Rodel Toby 0009-0009-2175-7284 author Battley Matthew 0000-0002-1357-9774 402414 author Benni Paul 0000-0001-6981-8722 author Bieryla Allyson 0000-0001-6637-5401 author Blake James A 0000-0002-5903-2387 author Bonfanti Andrea author Bouchy François 0000-0002-7613-393X 133687 Département d'astronomie (ASTRO) author Bryant Edward M 0000-0001-7904-4441 author Burleigh Matthew R 0000-0003-0684-7803 author Carlier Samuel J author Casewell Sarah L 0000-0003-2478-0120 author Chakraborty Hritam 0000-0002-5177-1898 973565 author Claringbold Alastair B 0000-0003-1309-5558 author Collins Karen A 0000-0001-6588-9574 author Davies Benjamin D R 0009-0000-5659-9006 author Dumusque Xavier 0000-0002-9332-2011 583253 Département d'astronomie (ASTRO) author Edkins Troy A 0009-0003-8688-7836 author Eeles-Nolle Fintan 0009-0009-6207-3217 author Egger Jo Ann 0000-0003-1628-4231 author Fernández Jorge Fernández 0000-0002-1416-2188 author Keniger Marcelo Aron Fetzner 0009-0005-2761-9190 author Figueira Pedro Ricardo 0000-0001-8504-283X 637397 author Goad Michael R author Harvey George author Hawthorn Faith 0000-0002-8675-182X author Hobson Melissa 0000-0002-5945-7975 417098 author Houelle Mathilde 0009-0001-7217-4099 402452 Département d'astronomie (ASTRO) author Isopi Giovanni author Jestin Timour 0009-0000-5585-7915 441109 author Kendall Alicia 0009-0006-0719-9229 author Lendl Monika 0000-0001-9699-1459 715612 Département d'astronomie (ASTRO) author Lewis Daniel author Lockley Isobel 0009-0003-0928-3588 author Mallia Franco author McCormac James 0000-0003-1631-4170 author Mitchell Morgan A 0009-0004-6130-7775 author Mignon Lucile 0000-0002-5407-3905 984034 author Osborn Hugh 0000-0002-4047-4724 author Psaridi Angeliki 0000-0002-4797-2419 942153 author Romanec Alex 0009-0009-1748-3428 author Saha Suman 0000-0001-8018-0264 author Sedgley Amber 0009-0001-7824-1715 author Sousa Sérgio 0000-0001-9047-2965 author Thomas Neil 0000-0002-2146-3894 author Udry Stéphane 0000-0001-7576-6236 23409 Département d'astronomie (ASTRO) author Watson Christopher 0000-0002-9718-3266 author West Richard G 0000-0001-6604-5533 author Wilson Thomas G 0000-0001-8749-1962 author Wheatley Peter J 0000-0003-1452-2240 author Williams Jamie T 0009-0007-8709-9689 author Zapparata Aldo 0000-0002-9428-1573 author Zieliński Krzysztof Sz 0009-0001-0389-8907 stag1271 10.1093/mnras/stag1271 0035-8711 https://academic.oup.com/mnras/article/doi/10.1093/mnras/stag1271/8725765 <p>We report the discovery and characterization of NGTS-39 b (TIC 453147896 b), a warm Jupiter transiting a Sun-like star on a 58.2 d, eccentric (e = $0.386\pm 0.019$) orbit. NGTS-39 b was first identified from a Transiting Exoplanet Survey Satellite single transit event, and subsequently confirmed with NGTS photometry and radial velocity measurements from CORALIE and HARPS. The host star is a bright ($T_{\mathrm{mag}}$ = 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 $1.088\pm 0.012$ RJ and a mass of $1.467\pm 0.081$ 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&gt; 50 d orbiting bright stars.</p> Dewey 520 STFC ST/W005077/1 UKRI EP/Z000890/1 European Space Agency Severo Ochoa CEX2021-001131-S FCT CEECIND/00826/2018 Science and Technology Facilities Council ST/X00094X/1 Swiss National Science Foundation TITANIA: TIme variabiliTy As a New window on exoplanet clImAtes 194576 CH Swiss National Science Foundation NCCR PlanetS: Origin, evolution and characterisation of planets (phase II) 182901 CH Swiss National Science Foundation NCCR PlanetS: Origin, evolution and characterisation of planets (phase III) 205606 CH European Commission Tracking Hydrates In Refined Sub-neptunes to Tackle their Emergence and Evolution 101164189 THIRSTEE EU HE 26 Département d'astronomie 12 false Monthly notices of the Royal Astronomical Society 550 2 1027727d-5c8f-409b-8901-e540e3fc1fe5 Article (Published version) Public stag1271.pdf 24817184 application/pdf CC BY-4.0 39d0d82db46f9dd14f1680d010bf08bf11d89fd5cea0577be8c49863119033bd openAccess Faculté des sciences / Département d'astronomie

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