stz3251.pdf (4.49 MB)
NGTS clusters survey - I. Rotation in the young benchmark open cluster Blanco 1
journal contribution
posted on 2020-03-11, 15:15 authored by Edward Gillen, Joshua T Briegal, Simon T Hodgkin, Daniel Foreman-Mackey, Floor Van Leeuwen, James AG Jackman, James McCormac, Richard G West, Didier Queloz, Daniel Bayliss, Michael R Goad, Christopher A Watson, Peter J Wheatley, Claudia Belardi, Matthew R Burleigh, Sarah L Casewell, James S Jenkins, Liam Raynard, Alexis MS Smith, Rosanna H Tilbrook, Jose I VinesWe determine rotation periods for 127 stars in the ~115 Myr old Blanco 1 open
cluster using ~200 days of photometric monitoring with the Next Generation
Transit Survey (NGTS). These stars span F5-M3 spectral types (1.2 $\gtrsim M
\gtrsim$ 0.3 M$_{\odot}$) and increase the number of known rotation periods in
Blanco 1 by a factor of four. We determine rotation periods using three
methods: Gaussian process (GP) regression, generalised autocorrelation (G-ACF)
and Lomb-Scargle (LS) periodograms, and find that GPs and G-ACF are more
applicable to evolving spot modulation patterns. Between mid-F and mid-K
spectral types, single stars follow a well-defined rotation sequence from ~2 to
10 days, whereas stars in photometric multiple systems typically rotate faster.
This may suggest that the presence of a moderate-to-high mass ratio companion
inhibits angular momentum loss mechanisms during the early pre-main sequence,
and this signature has not been erased at ~100 Myr. The majority of mid-F to
mid-K stars display evolving modulation patterns, whereas most M stars show
stable modulation signals. This morphological change coincides with the shift
from a well-defined rotation sequence (mid-F to mid-K stars) to a broad
rotation period distribution (late-K and M stars). Finally, we compare our
rotation results for Blanco 1 to the similarly-aged Pleiades: the single star
populations in both clusters possess consistent rotation period distributions,
which suggests that the angular momentum evolution of stars follows a
well-defined pathway that is, at least for mid-F to mid-K stars, strongly
imprinted by ~100 Myr.
Funding
This research is based on data collected under the NGTS project at the ESO La Silla Paranal Observatory. The NGTS facility is funded by a consortium of institutes consisting of the University of Warwick, the University of Leicester, Queen’s MNRAS 492, 1008–1024 (2020) Downloaded from https://academic.oup.com/mnras/article-abstract/492/1/1008/5673497 by guest on 11 March 2020 NCS – I. Rotation in Blanco 1 1023 University Belfast, the University of Geneva, the Deutsches Zentrum fur Luft- und Raumfahrt e.V. (DLR; under the ‘Großinvestition ¨ GI-NGTS’), and the University of Cambridge, together with the UK Science and Technology Facilities Council (STFC; project reference ST/M001962/1). EG gratefully acknowledges support from the David and Claudia Harding Foundation in the form of a Winton Exoplanet Fellowship. PJW was supported by STFC consolidated grant ST/P000495/1. CAW acknowledges support by the STFC grant ST/P000312/1. This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France (DOI : 10.26093/cds/vizier). The original description of the VizieR service was published in A&AS 143, 23(Ochsenbein, Bauer & Marcout 2000). This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France(Wenger et al. 2000). This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https: //www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.
History
Citation
Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 1, February 2020Author affiliation
Department of Physics and AstronomyVersion
- VoR (Version of Record)
Published in
Monthly Notices of the Royal Astronomical SocietyVolume
492Issue
1Pagination
1008–1024Publisher
Oxford University Pressissn
0035-8711eissn
1365-2966Acceptance date
2019-10-03Copyright date
2020Publisher DOI
Publisher version
https://academic.oup.com/mnras/article/492/1/1008/5673497Language
enUsage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC