Radial velocity confirmation of a hot super-Neptune discovered by TESS with a warm Saturn-mass companion

E. Knudstrup, D. Gandolfi, G. Nowak, C. M. Persson, E. Furlan, J. Livingston, E. Matthews, M. S. Lundkvist, M. L. Winther, J. L. Rørsted, S. H. Albrecht, E. Goffo, I. Carleo, H. J. Deeg, K. A. Collins, N. Narita, H. Isaacson, S. Redfield, F. Dai, T. HiranoJ. M. Akana Murphy, C. Beard, L. A. Buchhave, S. Cary, A. Chontos, I. Crossfield, W. D. Cochran, D. Conti, P. A. Dalba, M. Esposito, S. Fajardo-Acosta, S. Giacalone, S. K. Grunblatt, P. Guerra, A. P. Hatzes, R. Holcomb, F. G. Horta, A. W. Howard, D. Huber, J. M. Jenkins, P. Kabáth, S. Kane, J. Korth, K. W.F. Lam, K. V. Lester, R. Matson, K. K. Mcleod, J. Orell-Miquel, F. Murgas, E. Palle, A. S. Polanski, G. Ricker, P. Robertson, R. Rubenzahl, J. E. Schlieder, S. Seager, A. M.S. Smith, P. Tenenbaum, E. Turtelboom, R. Vanderspek, L. Weiss, J. Winn

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We report the discovery and confirmation of the planetary system TOI-1288. This late G dwarf harbours two planets: TOI-1288 b and TOI-1288 c. We combine TESS space-borne and ground-based transit photometry with HARPS-N and HIRES high-precision Doppler measurements, which we use to constrain the masses of both planets in the system and the radius of planet b. TOI-1288 b has a period of 2.699835+0.000004-0.000003 d, a radius of 5.24 ± 0.09 R⊕, and a mass of 42 ± 3 M⊕, making this planet a hot transiting super-Neptune situated right in the Neptunian desert. This desert refers to a paucity of Neptune-sized planets on short period orbits. Our 2.4-yr-long Doppler monitoring of TOI-1288 revealed the presence of a Saturn-mass planet on a moderately eccentric orbit (0.13+0.07-0.09) with a minimum mass of 84 ± 7 M⊕ and a period of 443+11-13 d. The five sectors worth of TESS data do not cover our expected mid-transit time for TOI-1288 c, and we do not detect a transit for this planet in these sectors.

Original languageEnglish (US)
Pages (from-to)5637-5655
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Mar 1 2023

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • planets and satellites: detection
  • techniques: photometric
  • techniques: radial velocities


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