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

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dc.citation.articleNumber161en_US
dc.citation.issueNumber2en_US
dc.citation.journalTitleThe Astrophysical Journalen_US
dc.citation.volumeNumber941en_US
dc.contributor.authorFurio, Matthew Deen_US
dc.contributor.authorLiu, Christopheren_US
dc.contributor.authorMeyer, Michael R.en_US
dc.contributor.authorReiter, Meganen_US
dc.contributor.authorKraus, Adamen_US
dc.contributor.authorDupuy, Trenten_US
dc.contributor.authorMonnier, Johnen_US
dc.date.accessioned2023-01-27T14:47:17Zen_US
dc.date.available2023-01-27T14:47:17Zen_US
dc.date.issued2022en_US
dc.description.abstractWe 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 M ⊙. 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 and the index of the power-law fit to the mass ratio distribution = 2.08 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.en_US
dc.identifier.citationFurio, Matthew De, Liu, Christopher, Meyer, Michael R., et al.. "Demographics of the M-star Multiple Population in the Orion Nebula Cluster." <i>The Astrophysical Journal,</i> 941, no. 2 (2022) IOP Publishing: https://doi.org/10.3847/1538-4357/aca285.en_US
dc.identifier.digitalDe_Furio_2022_ApJ_941_161en_US
dc.identifier.doihttps://doi.org/10.3847/1538-4357/aca285en_US
dc.identifier.urihttps://hdl.handle.net/1911/114260en_US
dc.language.isoengen_US
dc.publisherIOP Publishingen_US
dc.rightsOriginal content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleDemographics of the M-star Multiple Population in the Orion Nebula Clusteren_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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