Runaway Young Stars near the Orion Nebula

McBride, Aidan; Kounkel, Marina

doi:10.3847/1538-4357/ab3df9

Cited by 41 publications

(47 citation statements)

References 45 publications

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“…Refined measurements confirmed the original findings ) and unveiled additional runaway candidates with similar ejection times Luhman et al 2017). Other young runaway stars in the vicinity of the Orion Nebula Cluster with longer ejection times have been reported by McBride & Kounkel (2019) and Dzib et al (2017).…”

Section: Introductionsupporting

confidence: 73%

A Massive Young Runaway Star in W49 North

Rodríguez

Galván-Madrid

Sánchez-Bermúdez

et al. 2020

ApJ

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We analyzed high angular resolution 45.5 GHz images of the W49 North massive star forming region obtained in 1998 and 2016 with the Very Large Array. Most of the ultracompact HII regions show no detectable changes over the time interval of the observations. However, subcomponents B1, B2, G2a and G2c have increased its peak flux densities by values in the range of 3.8 to 21.4 %. Most interestingly, the cometary region C clearly shows proper motions that at the distance of the region are equivalent to a velocity of 76±6 km s −1 in the plane of the sky. We interpret this region as the ionized bowshock produced by a runaway O6 ZAMS star that was ejected from the eastern edge of Welch's ring about 6,400 years ago.

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Section: Introductionsupporting

confidence: 73%

A Massive Young Runaway Star in W49 North

Rodríguez

Galván-Madrid

Sánchez-Bermúdez

et al. 2020

ApJ

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“…Fourteen of these using Gaia DR2 RV, another 9 candidates using RV from Cottaar et al (2015) and 4 candidate using RV from Kounkel et al (2018). Five of the 7 2D WW candidates we have in common with McBride & Kounkel (2019) are also 3D WW candidates:…”

Section: D-candidatesmentioning

confidence: 97%

Runaway and walkaway stars from the ONC with Gaia DR2

Schoettler

Bruijne

Vaher

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Theory predicts that we should find fast, ejected (runaway) stars of all masses around dense, young star-forming regions. N-body simulations show that the number and distribution of these ejected stars could be used to constrain the initial spatial and kinematic substructure of the regions. We search for runaway and slower walkaway stars within 100 pc of the Orion Nebula Cluster (ONC) using Gaia DR2 astrometry and photometry. We compare our findings to predictions for the number and velocity distributions of runaway stars from simulations that we run for 4 Myr with initial conditions tailored to the ONC. In Gaia DR2, we find 31 runaway and 54 walkaway candidates based on proper motion, but not all of these are viable candidates in three dimensions. About 40 per cent are missing radial velocities, but we can trace back nine 3D runaways and 24 3D walkaways to the ONC, all of which are low/intermediate mass (<8 M⊙). Our simulations show that the number of runaways within 100 pc decreases the older a region is (as they quickly travel beyond this boundary), whereas the number of walkaways increases up to 3 Myr. We find fewer walkaways in Gaia DR2 than the maximum suggested from our simulations, which may be due to observational incompleteness. However, the number of Gaia DR2 runaways agrees with the number from our simulations during an age of ∼1.3–2.4 Myr, allowing us to confirm existing age estimates for the ONC (and potentially other star-forming regions) using runaway stars.

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“…The current status of potential runaway sources from the ONC is discussed in McBride & Kounkel (2019). They appear to cover the entire range of spectral types from O9.5 V down to late M stars.…”

Section: Onc Candidate Runawaysmentioning

confidence: 99%

“…There is one visual binary: sources #1 and #2 are at a spatial separation of 17 7, but they cannot be a physical pair due to the ∼10σ μ difference in proper motions. This pair is also discussed by McBride & Kounkel (2019). In fact, Table 5 contains only one new candidate runaway that is not listed by McBride & Kounkel (2019).…”

Section: Gaia Drmentioning

confidence: 99%

“…These new proper-motion measurements have also stimulated searches of the objects likely ejected from the ONC (Kim et al 2019;McBride & Kounkel 2019) and generated lists of potential low-mass runaways (<1 M ☉ ). Wang et al (2019) performed N-body simulations, specifically designed to imitate the ONC, which indicate that, within 1Myr, a few-body dynamical decay can eject a few massive OB stars.…”

Section: Introductionmentioning

confidence: 98%

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Hubble Space Telescope Astrometry in the Orion Nebula Cluster: Census of Low-mass Runaways

Platais

Robberto

Bellini

et al. 2020

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We present a catalog of high-precision proper motions in the Orion Nebula Cluster (ONC), based on Treasury Program observations with the Hubble Space Telescope's (HST) ACS/WFC camera. Our catalog contains 2454 objects in the magnitude range of 14.2<m F775W <24.7, thus probing the stellar masses of the ONC from ∼0.4 M ☉ down to ∼0.02 M ☉ over an area of ∼550 arcmin 2. We provide a number of internal velocity dispersion estimates for the ONC that indicate a weak dependence on stellar location and mass. There is good agreement with the published velocity dispersion estimates, although nearly all of them (including ours at s = 0.94 v x , and s = 1.25 v y , masyr −1) might be biased by the overlapping young stellar populations of Orion A. We identified four new ONC candidate runaways based on HST and the Gaia DR 2 data, all with masses less than ∼1 M ☉. The total census of known candidate runaway sources is 10-one of the largest samples ever found in any Milky Way open star cluster. Surprisingly, none of them have tangential velocities exceeding 20 km s −1. If most of them indeed originated in the ONC, it may compel the re-examination of dynamical processes in very young star clusters. It appears that the mass function of the ONC is not significantly affected by the lost runaways.

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Runaway Young Stars near the Orion Nebula

Cited by 41 publications

References 45 publications

A Massive Young Runaway Star in W49 North

A Massive Young Runaway Star in W49 North

Runaway and walkaway stars from the ONC with Gaia DR2

Hubble Space Telescope Astrometry in the Orion Nebula Cluster: Census of Low-mass Runaways

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