J/ApJ/871/174 Kepler rapid rotators and Ks-band excesses (Simonian+, 2019)
Rapid rotation in the Kepler field: not a single star phenomenon.
Simonian G.V.A., Pinsonneault M.H., Terndrup D.M.
<Astrophys. J., 871, 174 (2019)>
=2019ApJ...871..174S 2019ApJ...871..174S
ADC_Keywords: Abundances, [Fe/H]; Photometry, infrared; Magnitudes, absolute;
Stars, late-type; Stars, double and multiple
Keywords: binaries: close ; stars: late-type ; stars: rotation
Abstract:
Tens of thousands of rotation periods have been measured in the Kepler
fields, including a substantial fraction of rapid rotators. We use
Gaia parallaxes to distinguish photometric binaries (PBs) from single
stars on the unevolved lower main sequence, and compare their
distribution of rotation properties to those of single stars both with
and without Apache Point Observatory Galactic Evolution Experiment
(APOGEE) spectroscopic characterization. We find that 59% of stars
with 1.5day<P<7day lie 0.3mag above the main sequence, compared with
28% of the full rotation sample. The fraction of stars in the same
period range is 1.7±0.1% of the total sample analyzed for rotation
periods. Both the PB fraction and the fraction of rapid rotators are
consistent with a population of non-eclipsing short-period binaries
inferred from Kepler eclipsing binary data after correcting for
inclination. This suggests that the rapid rotators are dominated by
tidally synchronized binaries rather than single stars obeying
traditional angular momentum evolution. We caution against
interpreting rapid rotation in the Kepler field as a signature of
youth. Following up on this new sample of 217 candidate tidally
synchronized binaries will help further understand tidal processes in
stars.
Description:
The base sample of this study consists of Kepler dwarfs from
McQuillan+ (2014, J/ApJS/211/24) that were analyzed for photometric
starspot modulations. All targets in the Kepler field have stellar
parameters determined at the very least by Kepler Input Catalog (KIC)
photometry (Brown+ 2011, J/AJ/142/112 --see also V/133).
Our spectroscopic sample is selected from the APOGEE DR14
(Abolfathi+, 2018ApJS..235...42A 2018ApJS..235...42A).
The APOGEE spectrograph is a high-resolution (R∼22,000) multi-fiber
near-infrared spectrograph mounted on the Sloan Digital Sky Survey
(SDSS) 2.5m telescope at the Apache Point Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 65 217 Kepler rapid rotators
table2.dat 65 629 Kepler synchronization follow-up targets
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See also:
V/133 : Kepler Input Catalog (Kepler, 2009)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/450/681 : Companions to close spectroscopic binaries (Tokovinin+,2006)
J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)
J/A+A/497/497 : Physical parameters from JHK flux (Gonzalez-Hernandez+,2009)
J/ApJ/695/679 : Stellar rotation in M35 (Meibom+, 2009)
J/MNRAS/402/1380 : Rotation velocities in Pleiades & αPer (Jackson+,2010)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)
J/AJ/141/83 : Kepler Mission. I. Eclipsing binaries in DR1 (Prsa+, 2011)
J/AJ/142/160 : Kepler Mission. II. Eclipsing binaries DR2 (Slawson+, 2011)
J/ApJ/747/51 : Lagoon Nebula stars. I. Rotation periods (Henderson+, 2012)
J/ApJS/199/30 : Effective temperatures for KIC stars (Pinsonneault+,2012)
J/ApJ/767/95 : Improved parameters smallest KIC stars (Dressing+, 2013)
J/MNRAS/432/1203 : Rotation periods of M-dwarf stars (McQuillan+, 2013)
J/A+A/557/L10 : Rotation periods of 12000 Kepler stars (Nielsen+, 2013)
J/A+A/560/A4 : Rotation periods of active Kepler stars (Reinhold+, 2013)
J/ApJ/776/67 : Rotational tracks (van Saders+, 2013)
J/A+A/572/A34 : Pulsating solar-like stars in Kepler (Garcia+, 2014)
J/ApJS/211/2 : Revised stellar properties of Q1-16 Kepler (Huber+, 2014)
J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)
J/AJ/150/97 : Radial velocities in M67. I. (Geller+, 2015)
J/AJ/151/144 : ASPCAP weights of 15 APOGEE chemical elements (Garcia+,2016)
J/AJ/151/68 : Kepler Mission. VII. Eclipsing binaries in DR3 (Kirk+, 2016)
J/ApJ/824/15 : Orbital circulariza. Kepler eclipsing bin (Van Eylen+, 2016)
J/ApJ/844/102 : KIC star parallaxes asteroseismology vs Gaia (Huber+,2017)
J/AJ/154/250 : Kepler EB classifications and rotation periods (Lurie+,2017)
J/ApJS/229/30 : Revised stellar properties Q1-17 Kepler (Mathur+, 2017)
J/AJ/154/107 : CKS. I. 1305 stars (Petigura+, 2017)
J/ApJ/839/92 : Praesepe members with K2 light curve data (Rebull+, 2017)
J/ApJS/233/23 : APOKASC catalog of KIC dwarfs & subgiants (Serenelli+, 2017)
J/ApJ/866/99 : KIC stars & planets radii using Gaia DR2 (Berger+, 2018)
J/ApJS/239/32 : APOKASC-2 catalog Kepler evolved stars (Pinsonneault+, 2018)
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC [1296787/12783364] Kepler Input Catalog ID
for the star
10- 11 A2 --- --- [2M]
12- 27 A16 --- 2MASS APOGEE identifier (HHMMSSss+DDMMSSs; J2000)
29- 32 I4 K Teff [4047/5249] Effective temperature from
Pinsonneault+ 2012, J/ApJS/199/30
34- 39 F6.3 mag Ksmag [8.2/14.4] 2MASS Ks-band apparent magnitude
41- 45 F5.3 mag KMag [2.6/6.7] Absolute 2MASS K-band magnitude derived
from Gaia parallaxes
47- 52 F6.3 mag dK [-1.3/2.2] Vertical displacement above isochrone (1)
54- 59 F6.3 d Prot [1.5/11] Rotational period from
McQuillan+ 2014, J/ApJS/211/24
61- 65 F5.2 [-] [Fe/H] [-0.6/0.25]? APOGEE iron abundance
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Note (1): The vertical displacement above the median-metallicity
Mesa Isochrones and Stellar Tracks (MIST; Choi+ 2016ApJ...823..102C 2016ApJ...823..102C)
isochrone as derived in this work. See section 3 for further
explanations.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 03-Mar-2020