Age Determination in Upper Scorpius with Eclipsing Binaries

Abstract

The Upper Scorpius OB association is the nearest region of recent massive star formation and thus an important benchmark for investigations concerning stellar evolution and planet formation timescales. We present nine EBs in Upper Scorpius, three of which are newly reported here and all of which were discovered from K2 photometry. Joint fitting of the eclipse photometry and radial velocities from newly acquired Keck-I/HIRES spectra yields precise masses and radii for those systems that are spectroscopically double-lined. The binary orbital periods in our sample range from 0.6-100 days, with total masses ranging from 0.2-8 $M_{\odot }$. At least 33% of the EBs reside in hierarchical multiples, including two triples and one quadruple. We use these EBs to develop an empirical mass-radius relation for pre-main-sequence stars, and to evaluate the predictions of widely-used stellar evolutionary models. We report evidence for an age of 5-7 Myr which is self-consistent in the mass range of 0.3-5 $M_{\odot }$ and based on the fundamentally-determined masses and radii of eclipsing binaries (EBs). Evolutionary models including the effects of magnetic fields imply an age of 9-10 Myr. Our results are consistent with previous studies that indicate many models systematically underestimate the masses of low-mass stars by 20-60% based on H-R diagram analyses. We also consider the dynamical states of several binaries and compare with expectations from tidal dissipation theories. Finally, we identify RIK 72 b as a long-period transiting brown dwarf ($M=59.2\pm 6.8M_{\mathrm{Jup}}$, $R=3.10\pm 0.31R_{\mathrm{Jup}}$, $P\approx 97.8$ days) and an ideal benchmark for brown dwarf cooling models at 5-10 Myr.

accepted to The Astrophysical Journal

References in corpus (114)

• emcee: The MCMC Hammer
• Modules for Experiments in Stellar Astrophysics (MESA)
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• Evolutionary tracks and isochrones for low- and intermediate-mass stars: from 0.15 to 7 M_sun, and from Z=0.0004 to 0.03
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• The Dartmouth Stellar Evolution Database
• Disk Frequencies and Lifetimes in Young Clusters
• The K2 Mission: Characterization and Early results
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• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• Accurate masses and radii of normal stars: modern results and applications
• Shrinking binary and planetary orbits by Kozai cycles with tidal friction
• A Non-Gray Theory of Extrasolar Giant Planets and Brown Dwarfs
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• The NextGen Model Atmosphere grid for $3000\le \Teff \le 10000\K$
• A Universal Stellar Initial Mass Function? A Critical Look at Variations
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• Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
• The Occurrence and Architecture of Exoplanetary Systems
• Improving PARSEC models for very low mass stars
• SB9: The Ninth Catalogue of Spectroscopic Binary Orbits
• A Revised Age for Upper Scorpius and The Star-Formation History Among the F-Type Members of the Scorpius-Centaurus OB Association
• RadVel: The Radial Velocity Modeling Toolkit
• BANYAN. XI. The BANYAN $\Sigma$ multivariate Bayesian algorithm to identify members of young associations within 150 pc
• Absolute dimensions of the M-type eclipsing binary YY Geminorum (Castor C): a challenge to evolutionary models in the lower main-sequence
• Tidal dissipation in stars and giant planets
• Tertiary companions to close spectroscopic binaries
• The California Planet Survey I. Four New Giant Exoplanets
• The Star-formation History and Accretion-Disk Fraction Among the K-Type Members of the Scorpius-Centaurus OB Association
• Magnetic Inhibition of Convection and the Fundamental Properties of Low-Mass Stars. III. A Consistent 10 Myr Age for the Upper Scorpius OB Association
• An Assessment of Dynamical Mass Constraints on Pre-Main Sequence Evolutionary Tracks
• Evidence for Mass-dependent Circumstellar Disk Evolution in the 5 Myr-old Upper Scorpius OB Association
• ALMA Observations of Circumstellar Disks in the Upper Scorpius OB Association
• A Robust Measure of Tidal Circularization in Coeval Binary Populations: The solar-type spectroscopic Binary Population in The Open Cluster M35
• Spitzer Secondary Eclipses of the Dense, Modestly-irradiated, Giant Exoplanet HAT-P-20b Using Pixel-Level Decorrelation
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• Stellar Limb-Darkening Coefficients for CoRot and Kepler
• The Dependence of Differential Rotation on Temperature and Rotation
• Pre-main-sequence isochrones -- II. Revising star and planet formation timescales
• EVEREST: Pixel Level Decorrelation of K2 Light curves
• The Disk Population of the Upper Scorpius Association
• Planetary Candidates from the First Year of the K2 Mission
• Herbig Ae/Be Stars in nearby OB associations
• Mapping the Shores of the Brown Dwarf Desert I.: Upper Scorpius
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• Comparative statistics and origin of triple and quadruple stars
• Two Wide Planetary-Mass Companions to Solar-Type Stars in Upper Scorpius
• Eclipsing binaries as standard candles: HD 23642 and the distance to the Pleiades
• Rotation of Low-Mass Stars in Upper Scorpius and Rho Ophiuchus with K2
• They might be giants: luminosity class, planet frequency, and planet-metallicity relation of the coolest Kepler target stars
• Young "Dipper" Stars in Upper Sco and $\rho$ Oph Observed by K2
• Misaligned spin and orbital axes cause the anomalous precession of DI Herculis
• The solar-type eclipsing binary system LL Aquarii
• Older and Colder: The impact of starspots on pre-main sequence stellar evolution
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• STEREO observations of stars and the search for exoplanets
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• The Factory and the Beehive III: PTFEB132.707+19.810, a Low-Mass Eclipsing Binary in Praesepe Observed by PTF and K2
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