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

Research output: Contribution to journalArticle

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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. Our study uses X-ray data acquired during Chandra Orion Ultradeep Program (COUP) observations, as well as complementary optical and near-infrared data recently acquired with HST and the Very Large Telescope (VLT), respectively. Approximately 70% of ∼140 proplyds were detected as X-ray sources in the 838 ks COUP observation of the ONC, including ∼25% of proplyds that do not display central stars in HST imaging. In near-infrared imaging, the detection rate of proplyd central stars is >90%. Many proplyds display near-infrared excesses, suggesting disk accretion is ongoing onto the central, PMS stars. About 50% of circumstellar disks that are detected in absorption in HST imaging contain X-ray sources. For these sources, 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. Approximately 2/3 of the ∼30 proplyds and PMS stars exhibiting jets in Hubble images have COUP X-ray counterparts. These jet sources display some of the largest near-infrared excesses among the proplyds, suggesting that the origin of the jets is closely related to ongoing, PMS stellar accretion. One morphologically complex jet source, d181-825, displays a double-peaked X-ray spectral energy distribution with a prominent soft component that is indicative of strong shocks in the jet collimation region. A handful of similar objects also display X-ray spectra that are suggestive of shocks near the jet source. 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.

Original languageEnglish (US)
Pages (from-to)511-529
Number of pages19
JournalAstrophysical Journal, Supplement Series
Volume160
Issue number2
DOIs
StatePublished - Oct 1 2005

Fingerprint

Orion nebula
star clusters
near infrared
x rays
Hubble Space Telescope
pre-main sequence stars
stars
shock
accretion
stellar systems
protoplanetary disks
scale height
collimation
spectral energy distribution
accretion disks
inclination
telescopes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kastner, J. H., Franz, G., Grosso, N., Bally, J., Mccaughrean, M. J., Getman, K., ... Schulz, N. S. (2005). X-ray emission from Orion Nebula cluster stars with circumstellar disks and jets. Astrophysical Journal, Supplement Series, 160(2), 511-529. https://doi.org/10.1086/432096
Kastner, Joel H. ; Franz, Geoffrey ; Grosso, Nicolas ; Bally, John ; Mccaughrean, Mark J. ; Getman, Konstantin ; Feigelson, Eric D. ; Schulz, Norbert S. / X-ray emission from Orion Nebula cluster stars with circumstellar disks and jets. In: Astrophysical Journal, Supplement Series. 2005 ; Vol. 160, No. 2. pp. 511-529.
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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. Our study uses X-ray data acquired during Chandra Orion Ultradeep Program (COUP) observations, as well as complementary optical and near-infrared data recently acquired with HST and the Very Large Telescope (VLT), respectively. Approximately 70{\%} of ∼140 proplyds were detected as X-ray sources in the 838 ks COUP observation of the ONC, including ∼25{\%} of proplyds that do not display central stars in HST imaging. In near-infrared imaging, the detection rate of proplyd central stars is >90{\%}. Many proplyds display near-infrared excesses, suggesting disk accretion is ongoing onto the central, PMS stars. About 50{\%} of circumstellar disks that are detected in absorption in HST imaging contain X-ray sources. For these sources, 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. Approximately 2/3 of the ∼30 proplyds and PMS stars exhibiting jets in Hubble images have COUP X-ray counterparts. These jet sources display some of the largest near-infrared excesses among the proplyds, suggesting that the origin of the jets is closely related to ongoing, PMS stellar accretion. One morphologically complex jet source, d181-825, displays a double-peaked X-ray spectral energy distribution with a prominent soft component that is indicative of strong shocks in the jet collimation region. A handful of similar objects also display X-ray spectra that are suggestive of shocks near the jet source. 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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X-ray emission from Orion Nebula cluster stars with circumstellar disks and jets. / Kastner, Joel H.; Franz, Geoffrey; Grosso, Nicolas; Bally, John; Mccaughrean, Mark J.; Getman, Konstantin; Feigelson, Eric D.; Schulz, Norbert S.

In: Astrophysical Journal, Supplement Series, Vol. 160, No. 2, 01.10.2005, p. 511-529.

Research output: Contribution to journalArticle

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T1 - X-ray emission from Orion Nebula cluster stars with circumstellar disks and jets

AU - Kastner, Joel H.

AU - Franz, Geoffrey

AU - Grosso, Nicolas

AU - Bally, John

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AU - Getman, Konstantin

AU - Feigelson, Eric D.

AU - Schulz, Norbert S.

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N2 - 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. Our study uses X-ray data acquired during Chandra Orion Ultradeep Program (COUP) observations, as well as complementary optical and near-infrared data recently acquired with HST and the Very Large Telescope (VLT), respectively. Approximately 70% of ∼140 proplyds were detected as X-ray sources in the 838 ks COUP observation of the ONC, including ∼25% of proplyds that do not display central stars in HST imaging. In near-infrared imaging, the detection rate of proplyd central stars is >90%. Many proplyds display near-infrared excesses, suggesting disk accretion is ongoing onto the central, PMS stars. About 50% of circumstellar disks that are detected in absorption in HST imaging contain X-ray sources. For these sources, 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. Approximately 2/3 of the ∼30 proplyds and PMS stars exhibiting jets in Hubble images have COUP X-ray counterparts. These jet sources display some of the largest near-infrared excesses among the proplyds, suggesting that the origin of the jets is closely related to ongoing, PMS stellar accretion. One morphologically complex jet source, d181-825, displays a double-peaked X-ray spectral energy distribution with a prominent soft component that is indicative of strong shocks in the jet collimation region. A handful of similar objects also display X-ray spectra that are suggestive of shocks near the jet source. 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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