New Pleiades Eclipsing Binaries and a Hyades Transiting System Identified by K2

Abstract

We present the discovery in Kepler's $K2$ mission observations and our follow-up radial velocity observations from Keck/HIRES for four eclipsing binary (EB) star systems in the young benchmark Pleiades cluster. Based on our modeling results, we announce two new low mass ($M_{tot}<0.6M_{\odot }$) EBs among Pleiades members (HCG 76 and MHO 9) and we report on two previously known Pleiades binaries that are also found to be EB systems (HII 2407 and HD 23642). We measured the masses of the binary HCG 76 to $\lesssim$2.5% precision, and the radii to $\lesssim$4.5% precision, which together with the precise effective temperatures yield an independent Pleiades distance of 132$\pm$5 pc. We discuss another EB towards the Pleiades that is a possible but unlikely Pleiades cluster member (AK II 465). The two new confirmed Pleiades systems extend the mass range of Pleiades EB components to 0.2-2 $M_{\odot }$. Our initial measurements of the fundamental stellar parameters for the Pleiades EBs are discussed in the context of the current stellar models and the nominal cluster isochrone, finding good agreement with the stellar models of Baraffe et al. (2015) at the nominal Pleiades age of 120 Myr. Finally, in the Hyades, we report a new low mass eclipsing system (vA 50) that was concurrently discovered and studied by Mann et al. (2016). We confirm that the eclipse is likely caused by a Neptune-sized transiting planet, and with the additional radial velocity constraints presented here we improve the constraint on the maximum mass of the planet to be $\lesssim$1.2 $M_{\mathrm{Jup}}$.

37 pages, 19 figures, 12 tables, accepted to AJ

References in corpus (15)

• The K2 Mission: Characterization and Early results
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
• A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
• A nearby M star with three transiting super-Earths discovered by K2
• The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets
• The Age and Age Spread of the Praesepe and Hyades Clusters: a Consistent, ~800 Myr Picture from Rotating Stellar Models
• A VLBI Resolution of the Pleiades Distance Controversy
• Near and Mid-IR Photometry of the Pleiades, and a New List of Substellar Candidate Members
• Precise time-series photometry for the Kepler-2.0 mission
• Empirical Tests of Pre-Main-Sequence Stellar Evolution Models with Eclipsing Binaries
• K2 Variable Catalogue: Variable Stars and Eclipsing Binaries in K2 Campaigns 1 and 0
• The Seven Sisters DANCe. I. Empirical isochrones, Luminosity and Mass Functions of the Pleiades cluster
• New BVIc Photometry of Low-mass Pleiades Stars: Exploring the Effects of Rotation on Broadband Colors
• Kepler Eclipsing Binary Stars. V. Identification of 31 Eclipsing Binaries in the K2 Engineering Data-set

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• The Gould's Belt Distances Survey (GOBELINS) I. Trigonometric parallax distances and depth of the Ophiuchus complex
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• K2-264: A transiting multi-planet system in the Praesepe open cluster
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• Long-term Spectroscopic Survey of the Pleiades Cluster: The Binary Population
• TESS observations of the Pleiades cluster: a nursery for delta Scuti stars
• A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) -- III. Exploring the properties of young associations through their variables, dippers, and candidate exoplanets
• The Factory and the Beehive III: PTFEB132.707+19.810, a Low-Mass Eclipsing Binary in Praesepe Observed by PTF and K2
• TESS Hunt for Young and Maturing Exoplanets (THYME) VII : Membership, rotation, and lithium in the young cluster Group-X and a new young exoplanet
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• Optical and Radio Observations of the T Tauri Binary KH 15D (V582 Mon): Stellar Properties, Disk Mass Limit and Discovery of a CO Outflow
• NGTS clusters survey -- III: A low-mass eclipsing binary in the Blanco 1 open cluster spanning the fully convective boundary
• Mon-735: A new low-mass pre-main sequence eclipsing binary in NGC 2264
• Climbing the cosmic ladder with stellar twins in RAVE with Gaia
• Dynamical masses for the Pleiades binary system HII-2147
• $\delta$ Scuti pulsations in the bright Pleiades eclipsing binary HD 23642
• Uncovering the ultimate planet impostor. An eclipsing brown dwarf in a hierarchical triple with two evolved stars
• A young spectroscopic binary in a quintuple system part of the Local Association
• Low-mass and sub-stellar eclipsing binaries in stellar clusters
• On the incidence of planet candidates in open clusters and a planet confirmation
• TYCHO -- Realistically Simulating Exoplanets within Stellar Clusters I: Improving the Monte Carlo Approach
• Tidal Synchronization of Binaries in Pleiades