The Monitor project: JW 380 - A 0.26-, 0.15-M, pre-main-sequence eclipsing binary in the Orion nebula cluster

Jonathan Irwin, Suzanne Aigrain, Simon Hodgkin, Keivan G. Stassun, Leslie Hebb, Mike Irwin, Estelle Moraux, Jerome Bouvier, Aude Alapini, Richard Alexander, D. M. Bramich, Jon Holtzman, Eduardo L. Martín, Mark J. McCaughrean, Frédéric Pont, P. E. Verrier, María Rosa Zapatero Osorio

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

ABSTRACT We report the discovery of a low-mass (0.26 ± 0.02, 0.15 ± 0.01 M) pre-main-sequence (PMS) eclipsing binary (EB) with a 5.3 d orbital period. JW 380 was detected as part of a high-cadence time-resolved photometric survey (the Monitor project) using the 2.5-m 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 1σ 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 and 0.90 +0.17 -0.03 R for the primary and the 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 PMS EB systems with precise measurements available in the literature.

Original languageEnglish
Pages (from-to)541-550
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume380
Issue number2
DOIs
Publication statusPublished - 1 Sep 2007
Externally publishedYes

Fingerprint

Orion nebula
radial velocity
monitors
radii
stellar systems
stellar models
proper motion
extremely high frequencies
cross correlation
newton
cameras
telescopes
stars
orbitals
probes
probe
curves
project
modeling

Keywords

  • Binaries: eclipsing
  • Open clusters and associations: individual: Orion nebula cluster
  • Stars: individual: JW 380
  • Stars: pre-main-sequence
  • Surveys

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

The Monitor project : JW 380 - A 0.26-, 0.15-M, pre-main-sequence eclipsing binary in the Orion nebula cluster. / Irwin, Jonathan; Aigrain, Suzanne; Hodgkin, Simon; Stassun, Keivan G.; Hebb, Leslie; Irwin, Mike; Moraux, Estelle; Bouvier, Jerome; Alapini, Aude; Alexander, Richard; Bramich, D. M.; Holtzman, Jon; Martín, Eduardo L.; McCaughrean, Mark J.; Pont, Frédéric; Verrier, P. E.; Osorio, María Rosa Zapatero.

In: Monthly Notices of the Royal Astronomical Society, Vol. 380, No. 2, 01.09.2007, p. 541-550.

Research output: Contribution to journalArticle

Irwin, J, Aigrain, S, Hodgkin, S, Stassun, KG, Hebb, L, Irwin, M, Moraux, E, Bouvier, J, Alapini, A, Alexander, R, Bramich, DM, Holtzman, J, Martín, EL, McCaughrean, MJ, Pont, F, Verrier, PE & Osorio, MRZ 2007, 'The Monitor project: JW 380 - A 0.26-, 0.15-M, pre-main-sequence eclipsing binary in the Orion nebula cluster', Monthly Notices of the Royal Astronomical Society, vol. 380, no. 2, pp. 541-550. https://doi.org/10.1111/j.1365-2966.2007.12117.x
Irwin, Jonathan ; Aigrain, Suzanne ; Hodgkin, Simon ; Stassun, Keivan G. ; Hebb, Leslie ; Irwin, Mike ; Moraux, Estelle ; Bouvier, Jerome ; Alapini, Aude ; Alexander, Richard ; Bramich, D. M. ; Holtzman, Jon ; Martín, Eduardo L. ; McCaughrean, Mark J. ; Pont, Frédéric ; Verrier, P. E. ; Osorio, María Rosa Zapatero. / The Monitor project : JW 380 - A 0.26-, 0.15-M, pre-main-sequence eclipsing binary in the Orion nebula cluster. In: Monthly Notices of the Royal Astronomical Society. 2007 ; Vol. 380, No. 2. pp. 541-550.
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abstract = "ABSTRACT We report the discovery of a low-mass (0.26 ± 0.02, 0.15 ± 0.01 M⊙) pre-main-sequence (PMS) eclipsing binary (EB) with a 5.3 d orbital period. JW 380 was detected as part of a high-cadence time-resolved photometric survey (the Monitor project) using the 2.5-m 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 1σ 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 and 0.90 +0.17 -0.03 R⊙ for the primary and the 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 PMS EB systems with precise measurements available in the literature.",
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AU - Irwin, Jonathan

AU - Aigrain, Suzanne

AU - Hodgkin, Simon

AU - Stassun, Keivan G.

AU - Hebb, Leslie

AU - Irwin, Mike

AU - Moraux, Estelle

AU - Bouvier, Jerome

AU - Alapini, Aude

AU - Alexander, Richard

AU - Bramich, D. M.

AU - Holtzman, Jon

AU - Martín, Eduardo L.

AU - McCaughrean, Mark J.

AU - Pont, Frédéric

AU - Verrier, P. E.

AU - Osorio, María Rosa Zapatero

PY - 2007/9/1

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N2 - ABSTRACT We report the discovery of a low-mass (0.26 ± 0.02, 0.15 ± 0.01 M⊙) pre-main-sequence (PMS) eclipsing binary (EB) with a 5.3 d orbital period. JW 380 was detected as part of a high-cadence time-resolved photometric survey (the Monitor project) using the 2.5-m 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 1σ 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 and 0.90 +0.17 -0.03 R⊙ for the primary and the 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 PMS EB systems with precise measurements available in the literature.

AB - ABSTRACT We report the discovery of a low-mass (0.26 ± 0.02, 0.15 ± 0.01 M⊙) pre-main-sequence (PMS) eclipsing binary (EB) with a 5.3 d orbital period. JW 380 was detected as part of a high-cadence time-resolved photometric survey (the Monitor project) using the 2.5-m 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 1σ 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 and 0.90 +0.17 -0.03 R⊙ for the primary and the 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 PMS EB systems with precise measurements available in the literature.

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KW - Open clusters and associations: individual: Orion nebula cluster

KW - Stars: individual: JW 380

KW - Stars: pre-main-sequence

KW - Surveys

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