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TOI–1278 B: SPIRou Unveils a Rare Brown Dwarf Companion in Close-in Orbit around an M Dwarf

2021; Institute of Physics; Volume: 162; Issue: 4 Linguagem: Inglês

10.3847/1538-3881/ac096d

ISSN

1538-3881

Autores

Étienne Artigau, G. Hébrard, Charles Cadieux, Thomas Vandal, Neil J. Cook, René Doyon, Jonathan Gagné, C. Moutou, Eder Martioli, A. Frasca, Farbod Jahandar, David Lafrenière, Lison Malo, J.‐F. Donati, P. Cortés-Zuleta, I. Boisse, X. Delfosse, A. Carmona, P. Fouqué, J. Morin, Jason F. Rowe, G. Marino, Riccardo Papini, David R. Ciardi, Michael B. Lund, J. H. C. Martins, Stefan Pelletier, L. Arnold, F. Bouchy, T. Forveille, N. C. Santos, X. Bonfıls, P. Figueira, Michael Fausnaugh, G. Ricker, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Eric B. Ting, Guillermo Torres, J. Gomes da Silva,

Tópico(s)

Astronomy and Astrophysical Research

Resumo

Abstract We present the discovery of an 18.5 ± 0.5 M Jup brown dwarf (BD) companion to the M0V star TOI–1278. The system was first identified through a percent-deep transit in Transiting Exoplanet Survey Satellite photometry; further analysis showed it to be a grazing transit of a Jupiter-sized object. Radial velocity (RV) follow-up with the SPIRou near-infrared high-resolution velocimeter and spectropolarimeter in the framework of the 300-night SPIRou Legacy Survey carried out at the Canada–France–Hawaii Telescope led to the detection of a Keplerian RV signal with a semi-amplitude of 2306 ± 10 m s −1 in phase with the 14.5 day transit period, with a slight but nonzero eccentricity. The intermediate-mass ratio ( M ⋆ / M comp ∼ 31) is unique for having such a short separation (0.095 ± 0.001 au) among known M-dwarf systems. Interestingly, M-dwarf–BD systems with similar mass ratios exist with separations of tens to thousands of astronomical unit.

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