TOI-1278 B: SPIRou Unveils a Rare Brown Dwarf Companion in Close-in Orbit around an M Dwarf
Journal
Date Issued
2021
Author(s)
Artigau, Étienne
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Hébrard, Guillaume
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Cadieux, Charles
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Vandal, Thomas
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Cook, Neil J.
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Doyon, René
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Gagné, Jonathan
•
Moutou, Claire
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Martioli, Eder
•
•
Jahandar, Farbod
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Lafrenière, David
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Malo, Lison
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Donati, Jean-François
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Cortés-Zuleta, Pía
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Boisse, Isabelle
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Delfosse, Xavier
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Carmona, Andres
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Fouqué, Pascal
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Morin, Julien
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Rowe, Jason
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Marino, Giuseppe
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Papini, Riccardo
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Ciardi, David R.
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Lund, Michael B.
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Martins, Jorge H. C.
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Pelletier, Stefan
•
Arnold, Luc
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Bouchy, François
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Forveille, Thierry
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Santos, Nuno C.
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Bonfils, Xavier
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Figueira, Pedro
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Fausnaugh, Michael
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Ricker, George
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Latham, David W.
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Seager, Sara
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Winn, Joshua N.
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Jenkins, Jon M.
•
Ting, Eric B.
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Torres, Guillermo
•
Gomes da Silva, João
Abstract
We present the discovery of an 18.5 ± 0.5 MJup 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⋆/Mcomp ~ 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.
Volume
162
Issue
4
Start page
144
Issn Identifier
0004-6256
Ads BibCode
2021AJ....162..144A
Rights
open.access
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