Demographics of the M-star Multiple Population in the Orion Nebula Cluster

Matthew De Furio*, Christopher Liu, Michael R. Meyer, Megan Reiter, Adam Kraus, Trent Dupuy, John Monnier

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We present updated results constraining multiplicity demographics for the stellar population of the Orion Nebula Cluster (ONC, a high-mass, high-density star-forming region), across primary masses 0.08–0.7 Me. Our study utilizes archival Hubble Space Telescope data obtained with the Advanced Camera for Surveys using multiple filters (GO-10246). Previous multiplicity surveys in low-mass, low-density associations like Taurus identify an excess of companions to low-mass stars roughly twice that of the Galactic field and find the mass ratio distribution consistent with the field. Previously, we found the companion frequency to low-mass stars in the ONC is consistent with the Galactic field over mass ratios = 0.6–1.0 and projected separations = 30–160 au, without placing
constraints on the mass ratio distribution. In this study, we investigate the companion population of the ONC with a double point-spread function (PSF) fitting algorithm sensitive to separations larger than 10 au (0 025) using
empirical PSF models. We identified 44 companions (14 new), and with a Bayesian analysis we estimate the companion frequency to low-mass stars in the ONC = 0.13 0.03 0.05-+ and the index of the power-law fit to the mass ratio
distribution = 2.08 0.851.03-+ over all mass ratios and projected separations of 10–200 au. We find the companion frequency in the ONC is consistent with the Galactic field population, likely from states of high transient stellar density, and a probability of 0.002 that it is consistent with that of Taurus. We also find the ONC mass ratio distribution is consistent with the field and Taurus, potentially indicative of its primordial nature, a direct outcome of the star formation process.
Original languageEnglish
Article number161
Pages (from-to)1-18
Number of pages18
JournalAstrophysical Journal
Volume941
Issue number2
DOIs
Publication statusPublished - 20 Dec 2022

Keywords / Materials (for Non-textual outputs)

  • astro-ph.GA
  • astro-ph.SR

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