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Published November 17, 2015 | Published + Submitted
Journal Article Open

HII 2407: A Low-Mass Eclipsing Binary Revealed by K2 Observations of the Pleiades


The star HII 2407 is a member of the relatively young Pleiades star cluster and was previously discovered to be a single-lined spectroscopic binary. It is newly identified here within Kepler/K2 photometric time series data as an eclipsing binary system. Mutual fitting of the radial velocity and photometric data leads to an orbital solution and constraints on fundamental stellar parameters. While the primary has arrived on the main sequence, the secondary is still pre-main sequence and we compare our results for the M/M_⊙ and R/R_⊙ values with stellar evolutionary models. We also demonstrate that the system is likely to be tidally synchronized. Follow-up infrared spectroscopy is likely to reveal the lines of the secondary, allowing for dynamically measured masses and elevating the system to benchmark eclipsing binary status.

Additional Information

© 2015 The American Astronomical Society. Received 2015 September 27; accepted 2015 October 21; published 2015 November 17. We thank the referee for suggestions that led to significant improvements in this paper. We thank Lisa Prato for her estimate of the infrared flux ratio and look forward to a direct detection of the secondary. The material presented herein is based upon work supported in 2015 by the National Science Foundation Graduate Research Fellowship under grant No. DGE1144469. T.J.D. gratefully acknowledges support from France Córdova through the Neugebauer Scholarship. This research was partially supported by an appointment to the NASA Postdoctoral Program at the Ames Research Center, administered by Oak Ridge Associated Universities through a contract with NASA. Support for this work was provided by NASA via grant NNX15AV62G. This paper includes data collected by the Kepler mission. Funding for the Kepler mission is provided by the NASA Science Mission directorate. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. The Robo-AO system was developed by collaborating partner institutions, the California Institute of Technology and the Inter-University Centre for Astronomy and Astrophysics, and supported by the National Science Foundation under grant No. AST-0906060, AST-0960343, and AST-1207891, the Mt. Cuba Astronomical Foundation, and by a gift from Samuel Oschin. C.B. acknowledges support from the Alfred P. Sloan Foundation. A.C.C. acknowledges support from STFC grant ST/M001296/1. Funding for WASP comes from consortium universities and from UKs Science and Technology Facilities Council. Facilities: Kepler - The Kepler Mission, Keck:I (HIRES) - , PO:1.5m (Robo-AO) - , WIYN (HYDRA) - , SuperWASP - SuperWASP extra-solar planet detection program.

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Submitted - 1510.06399v1.pdf

Published - David_2015.pdf


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August 22, 2023
August 22, 2023