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TOI-1278 B: SPIRou unveils a rare Brown Dwarf Companion in Close-In Orbit around an M dwarf
Étienne Artigau, Guillaume Hébrard, Charles Cadieux +39
We present the discovery of an M brown dwarf (BD) companion to the M0V star TOI-1278. The system was first identified through a percent-deep transit in TESS…
A spectroscopic test of the rotational modulation origin of periodic \emph{Kepler} photometric variability of A-type stars
James Sikora, Gregg Wade, Jason Rowe
High-precision space-based photometry obtained by the \emph{Kepler} and \emph{TESS} missions has revealed evidence of rotational modulation associated with main sequence (MS) A and…
Spectropolarimetric follow-up of 8 rapidly rotating, X-ray bright FK Comae candidates
James Sikora, Jason Rowe, Steve Howell +2
Our understanding of the evolved, rapidly rotating, magnetically active, and apparently single FK Comae stars is significantly hindered by their extreme rarity: only two stars in a…
Insights into the inner regions of the FU Orionis disc
Michal Siwak, Maciej Winiarski, Waldemar Ogloza +12
Context. We investigate small-amplitude light variations in FU Ori occurring in timescales of days and weeks. Aims. We seek to determine the mechanisms that lead to these light cha…
Photometric variability of TW~Hya from seconds to years as seen from space and the ground in 2013-2017
M. Siwak, W. Ogloza, A. F. J. Moffat +9
This is the final photometric study of TW Hya based on new MOST satellite observations. During 2014 and 2017 the light curves showed stable 3.75 and 3.69 d quasi-periodic oscillati…
The Delta Scuti star 38 Eri from the ground and from space
M. Paparo, Z. Kollath, R. R. Shobbrook +17
We present and discuss the pulsational characteristics of the Delta Scuti star 38 Eri from photometric data obtained at two widely spaced epochs, partly from the ground (1998) and…