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Bourke, Tyler

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Bourke

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Tyler

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Bourke, Tyler
Author's Publications: search.filters.isAuthorOfPublication.94f6c843-b6d3-4101-8ab1-39512ff5e871

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    Alignment between Protostellar Outflows and Filamentary Structure
    (American Astronomical Society, 2017) Stephens, Ian; Dunham, Michael M.; Myers, Philip; Pokhrel, Riwaj; Sadavoy, Sarah; Vorobyov, Eduard I.; Tobin, John; Pineda, Jaime E.; Offner, Stella S. R.; Lee, Katherine I.; Kristensen, Lars E.; Jørgensen, Jes K.; Goodman, Alyssa; Bourke, Tyler; Arce, Héctor G.; Plunkett, Adele L.
    We present new Submillimeter Array (SMA) observations of CO(2-1) outflows toward young, embedded protostars in the Perseus molecular cloud as part of the Mass Assembly of Stellar Systems and their Evolution with the SMA (MASSES) survey. For 57 Perseus protostars, we characterize the orientation of the outflow angles and compare them with the orientation of the local filaments as derived from Herschel observations. We find that the relative angles between outflows and filaments are inconsistent with purely parallel or purely perpendicular distributions. Instead, the observed distribution of outflow-filament angles are more consistent with either randomly aligned angles or a mix of projected parallel and perpendicular angles. A mix of parallel and perpendicular angles requires perpendicular alignment to be more common by a factor of ̃3. Our results show that the observed distributions probably hold regardless of the protostar’s multiplicity, age, or the host core’s opacity. These observations indicate that the angular momentum axis of a protostar may be independent of the large-scale structure. We discuss the significance of independent protostellar rotation axes in the general picture of filament-based star formation.
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    Misalignment of Outflow Axes in the Proto-Multiple Systems in Perseus
    (American Astronomical Society, 2016) Lee, Katherine I.; Dunham, Michael M.; Myers, Philip; Arce, Héctor G.; Bourke, Tyler; Goodman, Alyssa; Jørgensen, Jes K.; Kristensen, Lars E.; Offner, Stella S. R.; Pineda, Jaime; Tobin, John J.; Vorobyov, Eduard I.
    We investigate the alignment between outflow axes in nine of the youngest binary/multiple systems in the Perseus Molecular Cloud. These systems have typical member spacing larger than 1000 au. For outflow identification, we use 12CO(2-1) and 12CO(3-2) data from a large survey with the Submillimeter Array: Mass Assembly of Stellar Systems and their Evolution with the SMA. The distribution of outflow orientations in the binary pairs is consistent with random or preferentially anti-aligned distributions, demonstrating that these outflows are misaligned. This result suggests that these systems are possibly formed in environments where the distribution of angular momentum is complex and disordered, and these systems do not come from the same co-rotating structures or from an initial cloud with aligned vectors of angular momentum.