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TOI-1278 B: SPIRou unveils a rare Brown Dwarf Companion in Close-In Orbit around an M dwarf

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arxiv 2106.04536 v1 pith:FQTIS3SL submitted 2021-06-08 astro-ph.SR astro-ph.EP

Étienne Artigau , Guillaume Hébrard , Charles Cadieux , Thomas Vandal , Neil J. Cook , René Doyon , Jonathan Gagné , Claire Moutou
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Eder Martioli Antonio Frasca Farbod Jahandar David Lafrenière Lison Malo Jean-François Donati Pia Cortes-Zuleta Isabelle Boisse Xavier Delfosse Andres Carmona Pascal Fouqué Julien Morin Jason Rowe Giuseppe Marino Riccardo Papini David R. Ciardi Michael B. Lund Jorge H. C. Martins Stefan Pelletier Luc Arnold François Bouchy Thierry Forveille Nuno C. Santos Xavier Bonfils Pedro Figueira Michael Fausnaugh George Ricker David W. Latham Sara Seager Joshua N. Winn Jon M. Jenkins Eric B. Ting Guillermo Torres João Gomes da Silva
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abstract

We present the discovery of an $18.5\pm0.5$M$_{\rm Jup}$ brown dwarf (BD) companion to the M0V star TOI-1278. The system was first identified through a percent-deep transit in TESS 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 (SLS) carried out at the Canada-France-Hawaii Telescope (CFHT) led to the detection of a Keplerian RV signal with a semi-amplitude of $2306\pm10$ m/s in phase with the 14.5-day transit period, having a slight but non-zero eccentricity. The intermediate-mass ratio ($M_\star/M_{\rm{comp}} \sim31$) is unique for having such a short separation ($0.095\pm0.001$ AU) among known M-dwarf systems. Interestingly, M dwarf-brown dwarf systems with similar mass ratios exist with separations of tens to thousands of AUs.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 37 citations worldwide. Full citation record

  1. Uniform Metallicity Measurements of M Dwarf Planet Hosts Support Metallicity-Dependent Sub-Neptune Formation

    astro-ph.EP 2026-07 conditional novelty 6.0 of 10

    Homogeneous SpeX metallicities of M-dwarf planet hosts show sub-Neptune hosts are more metal-rich than super-Earth hosts, supporting ice-line formation plus migration.

  2. On the Eccentricity Distribution and Tidal Evolution of Transiting Brown Dwarfs

    astro-ph.EP 2026-07 conditional novelty 6.0 of 10

    Short-period (P<16 d) transiting brown dwarfs are low-eccentricity while longer-period ones are more excited; assuming a shared primordial Beta distribution, tidal evolution constrains Q_BD ≈ 10^{7.1–8.1}.

  3. Unstable magnetospheric accretion on the T Tauri star TW Hya

    astro-ph.SR 2026-07 accept novelty 4.5 of 10

    TW Hya’s large-scale field is a ~0.83 kG tilted dipole that varies yearly; accretion is unstable (rmag/rcor ≈ 0.33–0.40) and no close-in planet is detected above ~0.3–1 Mjup.

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