Details

Autor(en) / Beteiligte

• Cointepas, M.
• Bouchy, F.
• Almenara, J. M.
• Bonfils, X.
• Astudillo-Defru, N.
• Knierim, H.
• Stalport, M.
• Mignon, L.
• Grieves, N.
• Bean, J.
• Brady, M.
• Burt, J.
• Canto Martins, B. L.
• Collins, K. A.
• Collins, K. I.
• Delfosse, X.
• de Medeiros, J. R.
• Demory, B.-O.
• Dorn, C.
• Forveille, T.
• Fukui, A.
• Gan, T.
• Gómez Maqueo Chew, Y.
• Halverson, S.
• Helled, R.
• Helm, I.
• Hirano, T.
• Horne, K.
• Howell, S. B.
• Isogai, K.
• Kasper, D.
• Kawauchi, K.
• Livingston, J. H.
• Massey, B.
• Matson, R. A.
• Murgas, F.
• Narita, N.
• Palle, E.
• Relles, H. M.
• Sabin, L.
• Schanche, N.
• Schwarz, R. P.
• Seifahrt, A.
• Shporer, A.
• Stefansson, G.
• Sturmer, J.
• Tamura, M.
• Tan, T.-G.
• Twicken, J. D.
• Watanabe, N.
• Wells, R. D.
• Wilkin, F. P.
• Ricker, G. R.
• Seager, S.
• Winn, J. N.
• Jenkins, J. M.

Titel

TOI-663: A newly discovered multi-planet system with three transiting mini-Neptunes orbiting an early M star

Ist Teil von

• Astronomy and astrophysics (Berlin), 2024-05, Vol.685, p.A19

Ort / Verlag

Heidelberg: EDP Sciences

Erscheinungsjahr

2024

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We present the detection of three exoplanets orbiting the early M dwarf TOI-663 (TIC 54962195; V = 13.7 mag, J = 10.4 mag, R ★ = 0.512 ± 0.015 R ⊙ , M ★ = 0.514 ± 0.012 M ⊙ , d = 64 pc). TOI-663 b, c, and d, with respective radii of 2.27 ± 0.10 R ⊕ , 2.26 ± 0.10 R ⊕ , and 1.92 ± 0.13 R ⊕ and masses of 4.45 ± 0.65 M ⊕ , 3.65 ± 0.97 M ⊕ , and <5.2 M ⊕ at 99%, are located just above the radius valley that separates rocky and volatile-rich exoplanets. The planet candidates are identified in two TESS sectors and are validated with ground-based photometric follow-up, precise radial-velocity measurements, and high-resolution imaging. We used the software package juliet to jointly model the photometric and radial-velocity datasets, with Gaussian processes applied to correct for systematics. The three planets discovered in the TOI-663 system are low-mass mini-Neptunes with radii significantly larger than those of rocky analogs, implying that volatiles, such as water, must predominate. In addition to this internal structure analysis, we also performed a dynamical analysis that confirmed the stability of the system. The three exoplanets in the TOI-663 system, similarly to other sub-Neptunes orbiting M dwarfs, have been found to have lower densities than planets of similar sizes orbiting stars of different spectral types.