TOI-1278 B: SPIRou unveils a rare Brown Dwarf Companion in Close-In Orbit around an M dwarf. (arXiv:2106.04536v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Artigau_E/0/1/0/all/0/1">&#xc9;tienne Artigau</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hebrard_G/0/1/0/all/0/1">Guillaume H&#xe9;brard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cadieux_C/0/1/0/all/0/1">Charles Cadieux</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vandal_T/0/1/0/all/0/1">Thomas Vandal</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cook_N/0/1/0/all/0/1">Neil J. Cook</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Doyon_R/0/1/0/all/0/1">Ren&#xe9; Doyon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gagne_J/0/1/0/all/0/1">Jonathan Gagn&#xe9;</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Moutou_C/0/1/0/all/0/1">Claire Moutou</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Martioli_E/0/1/0/all/0/1">Eder Martioli</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Frasca_A/0/1/0/all/0/1">Antonio Frasca</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jahandar_F/0/1/0/all/0/1">Farbod Jahandar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lafreniere_D/0/1/0/all/0/1">David Lafreni&#xe8;re</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Malo_L/0/1/0/all/0/1">Lison Malo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Donati_J/0/1/0/all/0/1">Jean-Fran&#xe7;ois Donati</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cortes_Zuleta_P/0/1/0/all/0/1">Pia Cortes-Zuleta</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Boisse_I/0/1/0/all/0/1">Isabelle Boisse</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Delfosse_X/0/1/0/all/0/1">Xavier Delfosse</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Carmona_A/0/1/0/all/0/1">Andres Carmona</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fouque_P/0/1/0/all/0/1">Pascal Fouqu&#xe9;</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Morin_J/0/1/0/all/0/1">Julien Morin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rowe_J/0/1/0/all/0/1">Jason Rowe</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marino_G/0/1/0/all/0/1">Giuseppe Marino</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Papini_R/0/1/0/all/0/1">Riccardo Papini</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ciardi_D/0/1/0/all/0/1">David R. Ciardi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lund_M/0/1/0/all/0/1">Michael B. Lund</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Martins_J/0/1/0/all/0/1">Jorge H. C. Martins</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pelletier_S/0/1/0/all/0/1">Stefan Pelletier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Arnold_L/0/1/0/all/0/1">Luc Arnold</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bouchy_F/0/1/0/all/0/1">Fran&#xe7;ois Bouchy</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Forveille_T/0/1/0/all/0/1">Thierry Forveille</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Santos_N/0/1/0/all/0/1">Nuno C. Santos</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bonfils_X/0/1/0/all/0/1">Xavier Bonfils</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Figueira_P/0/1/0/all/0/1">Pedro Figueira</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fausnaugh_M/0/1/0/all/0/1">Michael Fausnaugh</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ricker_G/0/1/0/all/0/1">George Ricker</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Latham_D/0/1/0/all/0/1">David W. Latham</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Seager_S/0/1/0/all/0/1">Sara Seager</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Winn_J/0/1/0/all/0/1">Joshua N. Winn</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jenkins_J/0/1/0/all/0/1">Jon M. Jenkins</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ting_E/0/1/0/all/0/1">Eric B. Ting</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Torres_G/0/1/0/all/0/1">Guillermo Torres</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Silva_J/0/1/0/all/0/1">Jo&#xe3;o Gomes da Silva</a>

We present the discovery of an $18.5pm0.5$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 $2306pm10$ 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 ($0.095pm0.001$ 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.

We present the discovery of an $18.5pm0.5$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 $2306pm10$ 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 ($0.095pm0.001$ 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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