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Rotational Evolution of Young, Binary M Dwarfs

Stauffer, John and Rebull, Luisa M. and Cody, Ann Marie and Hillenbrand, Lynne A. and Pinsonneault, Marc and Barrado, David and Bouvier, Jerome and David, Trevor (2018) Rotational Evolution of Young, Binary M Dwarfs. Astronomical Journal, 156 (6). Art. No. 275. ISSN 1538-3881. https://resolver.caltech.edu/CaltechAUTHORS:20181121-102119500

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Abstract

We have analyzed K2 light curves for more than 3000 low-mass stars in the ~8 Myr old Upper Sco association, the ~125 Myr age Pleiades open cluster, and the ~700 Myr old Hyades and Praesepe open clusters to determine stellar rotation rates. Many of these K2 targets show two distinct periods, and for the lowest-mass stars in these clusters, virtually all of these systems with two periods are photometric binaries. The most likely explanation is that we are detecting the rotation periods for both components of these binaries. We explore the evolution of the rotation rate in both components of photometric binaries relative to one another and to nonphotometric binary stars. In Upper Sco and the Pleiades, these low-mass binary stars have periods that are much shorter on average and much closer to each other than would be true if drawn at random from the M dwarf single stars. In Upper Sco, this difference correlates strongly with the presence or absence of infrared excesses due to primordial circumstellar disks—the single-star population includes many stars with disks, and their rotation periods are distinctively longer on average than their binary star cousins of the same mass. By Praesepe age, the significance of the difference in rotation rate between the single and binary low-mass M dwarf stars is much less, suggesting that angular momentum loss from winds for fully convective zero-age main-sequence stars erases memory of the rotation rate dichotomy for binary and single very low mass stars at later ages.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-3881/aae9ecDOIArticle
https://arxiv.org/abs/1810.08548arXivDiscussion Paper
ORCID:
AuthorORCID
Stauffer, John0000-0003-3595-7382
Rebull, Luisa M.0000-0001-6381-515X
Cody, Ann Marie0000-0002-3656-6706
Pinsonneault, Marc0000-0002-7549-7766
Barrado, David0000-0002-5971-9242
Bouvier, Jerome0000-0002-7450-6712
David, Trevor0000-0001-6534-6246
Additional Information:© 2018 The American Astronomical Society. Received 2018 May 25; revised 2018 October 15; accepted 2018 October 16; published 2018 November 21. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. This paper includes data collected by the Kepler mission. Funding for the Kepler mission is provided by the NASA Science Mission directorate. This research has made use of the NASA/IPAC Infrared Science Archive (IRSA), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of NASA's Astrophysics Data System (ADS) Abstract Service and of the SIMBAD database, operated at CDS, Strasbourg, France. This research has made use of data products from the Two Micron All-Sky Survey (2MASS), which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center, funded by the National Aeronautics and Space Administration and the National Science Foundation. The 2MASS data are provided by the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. Facility: K2 - , Exoplanet Archive, IRSA, 2MASS.
Group:Infrared Processing and Analysis Center (IPAC), Astronomy Department
Funders:
Funding AgencyGrant Number
NASANNX09AF08G
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:binaries: general – stars: low mass – stars: pre-main sequence – stars: rotation
Issue or Number:6
Record Number:CaltechAUTHORS:20181121-102119500
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181121-102119500
Official Citation:John Stauffer et al 2018 AJ 156 275
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91133
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Nov 2018 18:53
Last Modified:03 Oct 2019 20:32

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