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

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...

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Main Authors: Cointepas, Marion (Author) , Bouchy, F. (Author) , Almenara, J. M. (Author) , Bonfils, X. (Author) , Astudillo-Defru, N. (Author) , Knierim, H. (Author) , Stalport, M. (Author) , Mignon, L. (Author) , Grieves, N. (Author) , Bean, J. (Author) , Brady, M. (Author) , Burt, J. (Author) , Martins, B. L. Canto (Author) , Collins, K. A. (Author) , Collins, K. I. (Author) , Delfosse, X. (Author) , Medeiros, J. R. de (Author) , Demory, B.-O. (Author) , Dorn, C. (Author) , Forveille, T. (Author) , Fukui, A. (Author) , Gan, T. (Author) , Chew, Y. Gómez Maqueo (Author) , Halverson, S. (Author) , Helled, R. (Author) , Helm, I. (Author) , Hirano, T. (Author) , Horne, K. (Author) , Howell, S. B. (Author) , Isogai, K. (Author) , Kasper, D. (Author) , Kawauchi, K. (Author) , Livingston, J. H. (Author) , Massey, B. (Author) , Matson, R. A. (Author) , Murgas, F. (Author) , Narita, N. (Author) , Palle, E. (Author) , Relles, H. M. (Author) , Sabin, L. (Author) , Schanche, N. (Author) , Schwarz, R. P. (Author) , Seifahrt, A. (Author) , Shporer, A. (Author) , Stefansson, G. (Author) , Stürmer, Julian (Author) , Tamura, M. (Author) , Tan, T.-G. (Author) , Twicken, J. D. (Author) , Watanabe, N. (Author) , Wells, R. D. (Author) , Wilkin, F. P. (Author) , Ricker, G. R. (Author) , Seager, S. (Author) , Winn, J. N. (Author) , Jenkins, J. M. (Author)
Format: Article (Journal)
Language:English
Published: 30 April 2024
In: Astronomy and astrophysics
Year: 2024, Volume: 685, Pages: 1-18
ISSN:1432-0746
DOI:10.1051/0004-6361/202346899
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202346899
Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2024/05/aa46899-23/aa46899-23.html
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Author Notes:M. Cointepas, F. Bouchy, J.M. Almenara, X. Bonfils, N. Astudillo-Defru, H. Knierim, M. Stalport, L. Mignon, N. Grieves, J. Bean, M. Brady, J. Burt, B.L. Canto Martins, K.A. Collins, K.I. Collins, X. Delfosse, J.R. de Medeiros, B.-O. Demory, C. Dorn, T. Forveille, A. Fukui, T. Gan, Y. Gómez Maqueo Chew, S. Halverson, R. Helled, I. Helm, T. Hirano, K. Horne, S.B. Howell, K. Isogai, D. Kasper, K. Kawauchi, J.H. Livingston, B. Massey, R.A. Matson, F. Murgas, N. Narita, E. Palle, H.M. Relles, L. Sabin, N. Schanche, R.P. Schwarz, A. Seifahrt, A. Shporer, G. Stefansson, J. Sturmer, M. Tamura, T.-G. Tan, J.D. Twicken, N. Watanabe, R.D. Wells, F.P. Wilkin, G.R. Ricker, S. Seager, J.N. Winn, and J.M. Jenkins
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Summary: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.
Item Description:Gesehen am 09.12.2024
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202346899

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