NGTS clusters survey – I. Rotation in the young benchmark open cluster Blanco 1
Author
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Gillen, Edward
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Briegal, Joshua T.
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Hodgkin, Simon T.
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Foreman-Mackey, Daniel
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Van Leeuwen, Floor
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Jackman, James A. G.
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McCormac, James
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West, Richard G.
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Queloz, Didier
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Bayliss, Daniel
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Goad, Michael R.
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Watson, Christopher A.
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Wheatley, Peter J.
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Belardi, Claudia
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Burleigh, Matthew R.
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Casewell, Sarah L.
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Jenkins, James S.
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Raynard, Liam
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Smith, Alexis M. S.
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Tilbrook, Rosanna H.
Author
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Vines, José I.
Admission date
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2020-05-15T14:45:00Z
Available date
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2020-05-15T14:45:00Z
Publication date
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2020
Cita de ítem
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MNRAS 492, 1008–1024 (2020)
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Identifier
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10.1093/mnras/stz3251
Identifier
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https://repositorio.uchile.cl/handle/2250/174752
Abstract
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We determine rotation periods for 127 stars in the similar to 115-Myr-old Blanco 1 open cluster using similar to 200 d of photometric monitoring with the Next Generation Transit Survey. These stars span F5-M3 spectral types (1.2M(circle dot) greater than or similar to M greater than or similar to 0.3M(circle dot)) 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, generalized autocorrelation function (G-ACF), and Lomb-Scargle (LS) periodogram, and find that the GP and G-ACF methods 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 similar to 2 to 10 d, 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 similar to 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 similar to 100 Myr.
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Patrocinador
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University of Warwick
University of Leicester
Queen's University Belfast
University of Geneva
Deutsches Zentrum fur Luft-und Raumfahrt e.V. (DLR; under the 'Grobetainvestition GI-NGTS')
University of Cambridge
Science & Technology Facilities Council (STFC) ST/M001962/1
David and Claudia Harding Foundation
STFC consolidated grant ST/P000495/1
Science & Technology Facilities Council (STFC) ST/P000312/1
National Aeronautics & Space Administration (NASA)
National Science Foundation (NSF)