학술논문
TOI-1278 B: SPIRou unveils a rare Brown Dwarf Companion in Close-In Orbit around an M dwarf
Document Type
Working Paper
Author
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; Cortes-Zuleta, Pia; 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; da Silva, João Gomes
Source
Subject
Language
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.
Comment: accepted for publication in The Astronomical Journal
Comment: accepted for publication in The Astronomical Journal