TIC-65910228 b / NGTS-38 b, a 180 day transiting warm super-Jupiter
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2026
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| author | Rodel, Toby Ulmer-Moll, Solène Gill, Samuel Watson, Christopher. A. Eschen, Yoshi Nike Emilia Freckelton, Alix V. Mortier, Annelies Collins, Karen A. Dragomir, Diana Essack, Zahra Skinner, Brett Mallaghan, Niamh Wheatley, Peter J. Anderson, David R. Apergis, Ioannis Barkaoui, Khalid Battley, Matthew P. Bayliss, Daniel Bouchy, François Bryant, Edward M. Burleigh, Matthew R. Cadell, Benjamin M. J. Carlier, Samuel J. Carteret, Yann Casewell, Sarah L. Claringbold, Alastair B. Costes, Jean C. Davies, Benjamin D. R. Doyle, Lauren Evans, Phil Fernández, Jorge Fernández Fontanet, Emile Gillen, Edward Goad, Michael R. Harvey, George Hawthorn, Faith Hobbs, Katlyn L. Hobson, Melissa Isopi, Giovanni Jenkins, James S. Kendall, Alicia Kipping, David Lendl, Monika Mallia, Franco Mann, Christopher McCormac, James de Mooij, Ernst J. W. Moyano, Maximiliano Nigioni, Arianna Odeh, Mohammad Passegger, Vera Maria Saha, Suman Schwarz, Richard P. Sedgley, Amber Shporer, Avi Soubkiou, Abderahmane Udry, Stéphane Veras, Dimitri Vignes, Jean. P. Villanueva Jr., Steven Vinés, José I. West, Richard Wilson, Thomas G. Worters, Hannah L. Young, Mitchell E. Zapparata, Aldo |
| author_facet | Rodel, Toby Ulmer-Moll, Solène Gill, Samuel Watson, Christopher. A. Eschen, Yoshi Nike Emilia Freckelton, Alix V. Mortier, Annelies Collins, Karen A. Dragomir, Diana Essack, Zahra Skinner, Brett Mallaghan, Niamh Wheatley, Peter J. Anderson, David R. Apergis, Ioannis Barkaoui, Khalid Battley, Matthew P. Bayliss, Daniel Bouchy, François Bryant, Edward M. Burleigh, Matthew R. Cadell, Benjamin M. J. Carlier, Samuel J. Carteret, Yann Casewell, Sarah L. Claringbold, Alastair B. Costes, Jean C. Davies, Benjamin D. R. Doyle, Lauren Evans, Phil Fernández, Jorge Fernández Fontanet, Emile Gillen, Edward Goad, Michael R. Harvey, George Hawthorn, Faith Hobbs, Katlyn L. Hobson, Melissa Isopi, Giovanni Jenkins, James S. Kendall, Alicia Kipping, David Lendl, Monika Mallia, Franco Mann, Christopher McCormac, James de Mooij, Ernst J. W. Moyano, Maximiliano Nigioni, Arianna Odeh, Mohammad Passegger, Vera Maria Saha, Suman Schwarz, Richard P. Sedgley, Amber Shporer, Avi Soubkiou, Abderahmane Udry, Stéphane Veras, Dimitri Vignes, Jean. P. Villanueva Jr., Steven Vinés, José I. West, Richard Wilson, Thomas G. Worters, Hannah L. Young, Mitchell E. Zapparata, Aldo |
| contents | We present the discovery of TIC-65910228 b / NGTS-38 b, a giant exoplanet with a radius of $1.081\pm0.047$ R$_\text{J}$ and a mass of $4.78_{-0.37}^{+0.40}$ M$_\text{J}$ on a long-period ($180.52791\pm0.00038$ day), moderately eccentric ($e=0.308\pm0.011$) orbit transiting a bright (V=$10.230\pm0.020$ mag) metal rich ([Fe/H]=$0.33\pm0.09$, 'dex') F6V-F7V type host star. The planet was initially detected from a single transit in TESS Sector 33. A photometric monitoring campaign of 228 nights with NGTS detected a transit egress of the planet, which together with spectroscopic radial velocity monitoring with CORALIE and HARPS identified an orbital period of ~180.5,d. These radial velocity measurements also showed the mass of the companion to be planetary. Additional transit observations coordinated by the TESS follow-up observing program allowed further confirmation and refinement of this period. With its relatively cool equilibrium temperature of $458\pm11$ K, NGTS-38 b joins a small but growing population of well characterised transiting warm-Jupiters and has one of the longest periods of any discovered to date. The target is situated in the LOPS2 field of the upcoming PLATO mission which will allow for greater refinement of the system parameters and potential for the discovery of additional companions too small and/or too long-period to be seen by TESS or NGTS. NGTS-38 b's bright host star and wide orbital separation make it an attractive target for further study, including potential measurement of its spin-orbit alignment or targeted exomoon/ring searches. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_12977 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | TIC-65910228 b / NGTS-38 b, a 180 day transiting warm super-Jupiter Rodel, Toby Ulmer-Moll, Solène Gill, Samuel Watson, Christopher. A. Eschen, Yoshi Nike Emilia Freckelton, Alix V. Mortier, Annelies Collins, Karen A. Dragomir, Diana Essack, Zahra Skinner, Brett Mallaghan, Niamh Wheatley, Peter J. Anderson, David R. Apergis, Ioannis Barkaoui, Khalid Battley, Matthew P. Bayliss, Daniel Bouchy, François Bryant, Edward M. Burleigh, Matthew R. Cadell, Benjamin M. J. Carlier, Samuel J. Carteret, Yann Casewell, Sarah L. Claringbold, Alastair B. Costes, Jean C. Davies, Benjamin D. R. Doyle, Lauren Evans, Phil Fernández, Jorge Fernández Fontanet, Emile Gillen, Edward Goad, Michael R. Harvey, George Hawthorn, Faith Hobbs, Katlyn L. Hobson, Melissa Isopi, Giovanni Jenkins, James S. Kendall, Alicia Kipping, David Lendl, Monika Mallia, Franco Mann, Christopher McCormac, James de Mooij, Ernst J. W. Moyano, Maximiliano Nigioni, Arianna Odeh, Mohammad Passegger, Vera Maria Saha, Suman Schwarz, Richard P. Sedgley, Amber Shporer, Avi Soubkiou, Abderahmane Udry, Stéphane Veras, Dimitri Vignes, Jean. P. Villanueva Jr., Steven Vinés, José I. West, Richard Wilson, Thomas G. Worters, Hannah L. Young, Mitchell E. Zapparata, Aldo Earth and Planetary Astrophysics We present the discovery of TIC-65910228 b / NGTS-38 b, a giant exoplanet with a radius of $1.081\pm0.047$ R$_\text{J}$ and a mass of $4.78_{-0.37}^{+0.40}$ M$_\text{J}$ on a long-period ($180.52791\pm0.00038$ day), moderately eccentric ($e=0.308\pm0.011$) orbit transiting a bright (V=$10.230\pm0.020$ mag) metal rich ([Fe/H]=$0.33\pm0.09$, 'dex') F6V-F7V type host star. The planet was initially detected from a single transit in TESS Sector 33. A photometric monitoring campaign of 228 nights with NGTS detected a transit egress of the planet, which together with spectroscopic radial velocity monitoring with CORALIE and HARPS identified an orbital period of ~180.5,d. These radial velocity measurements also showed the mass of the companion to be planetary. Additional transit observations coordinated by the TESS follow-up observing program allowed further confirmation and refinement of this period. With its relatively cool equilibrium temperature of $458\pm11$ K, NGTS-38 b joins a small but growing population of well characterised transiting warm-Jupiters and has one of the longest periods of any discovered to date. The target is situated in the LOPS2 field of the upcoming PLATO mission which will allow for greater refinement of the system parameters and potential for the discovery of additional companions too small and/or too long-period to be seen by TESS or NGTS. NGTS-38 b's bright host star and wide orbital separation make it an attractive target for further study, including potential measurement of its spin-orbit alignment or targeted exomoon/ring searches. |
| title | TIC-65910228 b / NGTS-38 b, a 180 day transiting warm super-Jupiter |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2602.12977 |