Radial velocity confirmation of a hot super-Neptune discovered by TESS with a warm Saturn–mass companion. Issue 4 (16th December 2022)

• Record Type: Journal Article
• Authors: Knudstrup, E; Gandolfi, D; Nowak, G; Persson, C M; Furlan, E; Livingston, J; Matthews, E; Lundkvist, M S; Winther, M L; Rørsted, J L; Albrecht, S H; Goffo, E; Carleo, I; Deeg, H J; Collins, K A; Narita, N; Isaacson, H; Redfield, S; Dai, F; Hirano, T; Akana Murphy, J M; Beard, C; Buchhave, L A; Cary, S; Chontos, A; Crossfield, I; Cochran, W D; Conti, D; Dalba, P A; Esposito, M; Fajardo-Acosta, S; Giacalone, S; Grunblatt, S K; Guerra, P; Hatzes, A P; Holcomb, R; Horta, F G; Howard, A W; Huber, D; Jenkins, J M; Kabáth, P; Kane, S; Korth, J; Lam, K W F; Lester, K V; Matson, R; McLeod, K K; Orell-Miquel, J; Murgas, F; Palle, E; Polanski, A S; Ricker, G; Robertson, P; Rubenzahl, R; Schlieder, J E; Seager, S; Smith, A M S; Tenenbaum, P; Turtelboom, E; Vanderspek, R; Weiss, L; Winn, J;
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 519:Issue 4(2023)
• Page Start: 5637
• Page End: 5655
• Publication Date: 2022-12-16
• Subjects: techniques: photometric -- techniques: radial velocities -- planets and satellites: detection; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stac3684
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: 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.