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http://hdl.handle.net/20.500.12386/32202
Title: | TOI-1278 B: SPIRou Unveils a Rare Brown Dwarf Companion in Close-in Orbit around an M Dwarf | Authors: | Artigau, Étienne Hébrard, Guillaume Cadieux, Charles Vandal, Thomas Cook, Neil J. Doyon, René Gagné, Jonathan Moutou, Claire Martioli, Eder FRASCA, Antonio Jahandar, Farbod Lafrenière, David Malo, Lison Donati, Jean-François Cortés-Zuleta, Pía Boisse, Isabelle Delfosse, Xavier Carmona, Andres Fouqué, Pascal Morin, Julien Rowe, Jason Marino, Giuseppe Papini, Riccardo Ciardi, David R. Lund, Michael B. Martins, Jorge H. C. Pelletier, Stefan Arnold, Luc Bouchy, François Forveille, Thierry Santos, Nuno C. Bonfils, Xavier Figueira, Pedro Fausnaugh, Michael Ricker, George Latham, David W. Seager, Sara Winn, Joshua N. Jenkins, Jon M. Ting, Eric B. Torres, Guillermo Gomes da Silva, João |
Issue Date: | 2021 | Journal: | THE ASTRONOMICAL JOURNAL | Number: | 162 | Issue: | 4 | First Page: | 144 | Abstract: | We present the discovery of an 18.5 ± 0.5 M<SUB>Jup</SUB> 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<SUP>-1</SUP> in phase with the 14.5 day transit period, with a slight but nonzero eccentricity. The intermediate-mass ratio (M<SUB>⋆</SUB>/M<SUB>comp</SUB> ~ 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. | URI: | http://hdl.handle.net/20.500.12386/32202 | URL: | https://iopscience.iop.org/article/10.3847/1538-3881/ac096d https://api.elsevier.com/content/abstract/scopus_id/85116339172 |
ISSN: | 0004-6256 | DOI: | 10.3847/1538-3881/ac096d | Bibcode ADS: | 2021AJ....162..144A | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Artigau_2021_AJ_162_144.pdf | Pdf editoriale | 2.7 MB | Adobe PDF | View/Open |
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