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X-ray Emission from Orion Nebula Cluster Stars with Circumstellar Disks and Jets

Joel H. Kastner·Geoffrey Franz·Nicolas Grosso·John Bally·Mark J. McCaughrean·Konstantin Getman·Eric D. Feigelson·Norbert S. Schulz
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Abstract

We investigate the X-ray and near-infrared emission properties of a sample of pre-main sequence (PMS) stellar systems in the Orion Nebula Cluster (ONC) that display evidence for circumstellar disks (``proplyds'') and optical jets in Hubble Space Telescope (HST) imaging. Approximately 70% of ~140 proplyds were detected as X-ray sources in the Chandra Orion Ultradeep Program observation of the ONC, including ~25% of proplyds that do not display central stars in HST imaging. Many proplyds display near-infrared excesses, suggesting disk accretion is ongoing onto the central, PMS stars. Among circumstellar disks that are detected in absorption in HST imaging, we find that X-ray absorbing column and apparent disk inclination are well correlated, providing insight into the disk scale heights and metal abundances of UV- and X-ray-irradiated protoplanetary disks. Jet sources display some of the largest near-infrared excesses among the X-ray-detected proplyds, suggesting that the origin of the jets is closely related to ongoing, PMS stellar accretion. Some jet sources display double-peaked X-ray spectral energy distributions, with soft components indicative of strong shocks in the jet collimation region. These results support models in which circumstellar disks collimate and/or launch jets from young stellar objects and, furthermore, demonstrate that star-disk-jet interactions may contribute to PMS X-ray emission.

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Joel H. Kastner, Geoffrey Franz, Nicolas Grosso, John Bally, Mark J. McCaughrean, Konstantin Getman, Eric D. Feigelson, Norbert S. Schulz. 2005-06-27. X-ray Emission from Orion Nebula Cluster Stars with Circumstellar Disks and Jets. https://doi.org/10.1086/432096

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