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

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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
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Pages (from-to)5637-5655
Publication statusPublished - 2023


  • Techniques: photometric
  • Techniques: radial velocities
  • Planets and satellites: detection


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