The Monitor project: JW 380 -- a 0.26, 0.15 Msol pre main sequence eclipsing binary in the Orion Nebula Cluster

Abstract

We report the discovery of a low-mass (0.26 +/- 0.02, 0.15 +/- 0.01 Msol) pre-main-sequence eclipsing binary with a 5.3 day orbital period. JW 380 was detected as part of a high-cadence time-resolved photometric survey (the Monitor project) using the 2.5m Isaac Newton Telescope and Wide Field Camera for a survey of a single field in the Orion Nebula Cluster (ONC) region in V and i bands. The star is assigned a 99 per cent membership probability from proper motion measurements, and radial velocity observations indicate a systemic velocity within 1 sigma of that of the ONC. Modelling of the combined light and radial velocity curves of the system gave stellar radii of 1.19 +0.04 -0.18 Rsol and 0.90 +0.17 -0.03 Rsol for the primary and secondary, with a significant third light contribution which is also visible as a third peak in the cross-correlation functions used to derive radial velocities. The masses and radii appear to be consistent with stellar models for 2-3 Myr age from several authors, within the present observational errors. These observations probe an important region of mass-radius parameter space, where there are currently only a handful of known pre-main-sequence eclipsing binary systems with precise measurements available in the literature.

11 pages, 9 figures, accepted for publication in MNRAS

References in corpus (21)

• 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
• A Non-Gray Theory of Extrasolar Giant Planets and Brown Dwarfs
• Evolutionary models for very-low-mass stars and brown dwarfs with dusty atmospheres
• Towards Better Age Estimates for Stellar Populations: The Y^2 Isochrones for Solar Mixture
• Evolutionary models for low-mass stars and brown dwarfs: uncertainties and limits at very young ages
• Chandra Orion Ultradeep Project: Observations and Source Lists
• Eclipsing binaries in open clusters. II. V453 Cyg in NGC 6871
• First radius measurements of very low mass stars with the VLTI
• Doppler follow-up of OGLE transiting companions in the Galactic bulge
• Eclipsing binaries in open clusters. III. V621 Per in chi Persei
• Absolute dimensions of detached eclipsing binaries. I. The metallic-lined system WW Aurigae
• A Correlation Between Pre-Main Sequence Stellar Rotation Rates and IRAC Excesses in Orion
• Dynamical Mass Constraints on Low-Mass Pre-Main-Sequence Stellar Evolutionary Tracks: An Eclipsing Binary in Orion with a 1.0 Msun Primary and an 0.7 Msun Secondary
• The Monitor project: Data processing and lightcurve production
• Doppler follow-up of OGLE planetary transit candidates in Carina
• Practical Planet Prospecting
• The Monitor project: Searching for occultations in young open clusters
• The Monitor project: Rotation of low-mass stars in the open cluster M34
• An Upper Bound on the Flux Ratio of rho CrB's Companion at 1.6um
• IR Detection of Low-Mass Secondaries in Spectroscopic Binaries
• Photometric variability in the old open cluster M 67. II. General Survey

Cited by in corpus (39)

• YSOVAR: the first sensitive, wide-area, mid-IR photometric monitoring of the ONC
• The Formation and Early Evolution of Low-mass Stars and Brown Dwarfs
• The Coevality of Young Binary Systems
• Results of the ROTOR-program. II. The long-term photometric variability of weak-line T Tauri stars
• Empirical Tests of Pre-Main-Sequence Stellar Evolution Models with Eclipsing Binaries
• New low-mass eclipsing binary systems in Praesepe discovered by K2
• Young Stellar Object Variability (YSOVAR): Long Timescale Variations in the Mid-Infrared
• GJ 3236: a new bright, very low-mass eclipsing binary system discovered by the MEarth observatory
• Infrared Spectroscopy and Analysis of Brown Dwarf and Planetary Mass Objects in the Orion Nebula Cluster
• Time-Series Photometry of Stars in and around the Lagoon Nebula. I. Rotation Periods of 290 Low-Mass Pre-Main-Sequence Stars in NGC 6530
• Discovery and characterisation of detached M-dwarf eclipsing binaries in the WFCAM Transit Survey
• Stellar Rotation in the Gaia Era: Revised Open Clusters Sequences
• Surprising dissimilarities in a newly formed pair of 'identical twin' stars
• Deep MMT Transit Survey of the Open Cluster M37 I: Observations and Cluster Parameters
• CoRoT 223992193: A new, low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk
• Luminosity Discrepancy in the Equal-Mass, Pre--Main Sequence Eclipsing Binary Par 1802: Non-Coevality or Tidal Heating?
• YSOVAR: Six pre-main-sequence eclipsing binaries in the Orion Nebula Cluster
• The Palomar Transient Factory Orion Project: Eclipsing Binaries and Young Stellar Objects
• A highly unequal-mass eclipsing M-dwarf binary in the WFCAM Transit Survey
• Near-Infrared Variability in the Orion Nebula Cluster
• Discovery of Par 1802 as a Low-Mass, Pre-Main-Sequence Eclipsing Binary in the Orion Star-Forming Region
• Substellar Objects in Nearby Young Clusters VII: The substellar mass function revisited
• IN-SYNC VI. Identification and Radial Velocity Extraction for 100+ Double-Lined Spectroscopic Binaries in the APOGEE/IN-SYNC Fields
• The Pre-Main-Sequence Eclipsing Binary ASAS J052821+0338.5
• Exploring pre-main sequence variables of ONC: The new variables
• An eclipsing double-line spectroscopic binary at the stellar/substellar boundary in the Upper Scorpius OB association
• Orbital and physical parameters of eclipsing binaries from the ASAS catalogue -- II. Two spotted M < 1 M${}_{\odot }$ systems at different evolutionary stages
• The University of New South Wales Extrasolar Planet Search: a catalogue of variable stars from fields observed 2004--2007
• MML 53: a new low-mass, pre-main sequence eclipsing binary in the Upper Centarus-Lupus Region discovered by SuperWASP
• A low-mass eclipsing binary within the fully convective zone from the NGTS
• Mon-735: A new low-mass pre-main sequence eclipsing binary in NGC 2264
• Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue - VII. V1200 Centauri: a bright triple in the Hyades moving group
• Coevality in Young Eclipsing Binaries
• 1318 New Variable Stars in a 0.25 Square Degree Region of the Galactic Plane
• The NEMESIS Catalogue of Young Stellar Objects for the Orion Star Formation Complex. I. General description of data curation
• Fundamental properties of the pre-main sequence eclipsing stars of MML 53 and the mass of the tertiary
• Low-mass and sub-stellar eclipsing binaries in stellar clusters
• Evolutionary Status of T Tauri Stars
• Discovery of the pre-main-sequence eclipsing binary MML 48