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The puzzling story of flare inactive ultra fast rotating M dwarfs. II. Searching for radial velocity variations
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Ramsay, Gavin, Hakala, Pasi, Doyle, J. Gerry, Doyle, Lauren and Bagnulo, Stefano (2022) The puzzling story of flare inactive ultra fast rotating M dwarfs. II. Searching for radial velocity variations. Monthly Notices of the Royal Astronomical Society, 511 (2). pp. 2755-2764. doi:10.1093/mnras/stac188 ISSN 1745-3933.
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Official URL: https://doi.org/10.1093/mnras/stac188
Abstract
Observations made using TESS revealed a sample of low mass stars which show a periodic modulation on a period <0.2 d. Surprisingly many of these Ultra Fast Rotating (UFR) stars showed no evidence of flare activity which would be expected from such rapidly rotating stars. We present results from a spectroscopic survey of UFRs using the Nordic Optical Telescope to search for radial velocity variations which could reveal evidence for binarity. Our sample of 29 sources have a photometric period between 0.1-0.2d, cover spectral classes of M0-4V, and show no evidence for flares. We detect only one source with clear radial velocity shifts, with another two having Gaia RUWE values which suggests they are binaries. Further observations reveal the former star possibly contains a brown dwarf companion with a mass of M2>58 MJup and probability P(M2<90 MJup) = 50%. There is no evidence for the companion in our spectra, strengthening the case for a brown dwarf companion. We also examine the folded TESS light curves of all our targets, finding at least two are eclipsing binaries and one which has been contaminated by a spatially nearby δ Sct star. We estimate that around 1/4 of our targets may have been contaminated by short period variable stars. However, the majority of our targets are consistent with being single, low mass stars whose variability is due to starspots. We outline the possible reasons why they are not flare active despite being such rapid rotators.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
SWORD Depositor: | Library Publications Router | ||||||||||||
Library of Congress Subject Headings (LCSH): | Dwarf stars , Low mass stars , Flare stars , M stars -- Motion in line of sight | ||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||
Publisher: | Oxford University Press | ||||||||||||
ISSN: | 1745-3933 | ||||||||||||
Official Date: | April 2022 | ||||||||||||
Dates: |
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Volume: | 511 | ||||||||||||
Number: | 2 | ||||||||||||
Page Range: | pp. 2755-2764 | ||||||||||||
DOI: | 10.1093/mnras/stac188 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Reuse Statement (publisher, data, author rights): | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved. | ||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
Date of first compliant deposit: | 22 March 2022 | ||||||||||||
Date of first compliant Open Access: | 23 March 2022 | ||||||||||||
RIOXX Funder/Project Grant: |
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