Academic Journal
The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. V. A Characterization of Protostellar Multiplicity
| العنوان: | The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. V. A Characterization of Protostellar Multiplicity |
|---|---|
| المؤلفون: | Tobin, J.J., Offner, S.S.R., Kratter, K.M., Megeath, S.T., Sheehan, P.D., Looney, L.W., Diaz-Rodriguez, A.K., Osorio, M., Anglada, G., Sadavoy, S.I., Furlan, E., Segura-Cox, D., Karnath, N., Van 'T Hoff, M.L.R., Van Dishoeck, E.F., Li, Z.-Y., Sharma, R., Stutz, A.M., Tychoniec, Ł. |
| المساهمون: | University of Arizona, Steward Observatory |
| المصدر: | Astrophysical Journal |
| بيانات النشر: | IOP Publishing Ltd |
| سنة النشر: | 2022 |
| المجموعة: | The University of Arizona: UA Campus Repository |
| الوصف: | We characterize protostellar multiplicity in 20 Current address: Niels Bohr Institute, University of Copenhagen, Øster Voldgade 5a7, DK-1350, Copenhagen K, Denmark. the Orion molecular clouds using Atacama Large Millimeter/submillimeter Array 0.87 mm and Very Large Array 9 mm continuum surveys toward 328 protostars. These observations are sensitive to projected spatial separations as small as ∼20 au, and we consider source separations up to 104 au as potential companions. The overall multiplicity fraction (MF) and companion fraction (CF) for the Orion protostars are 0.30 ± 0.03 and 0.44 ± 0.03, respectively, considering separations from 20 to 104 au. The MFs and CFs are corrected for potential contamination by unassociated young stars using a probabilistic scheme based on the surface density of young stars around each protostar. The companion separation distribution as a whole is double peaked and inconsistent with the separation distribution of solar-type field stars, while the separation distribution of Flat Spectrum protostars is consistent solar-type field stars. The multiplicity statistics and companion separation distributions of the Perseus star-forming region are consistent with those of Orion. Based on the observed peaks in the Class 0 separations at ∼100 au and ∼103 au, we argue that multiples with separations <500 au are likely produced by both disk fragmentation and turbulent fragmentation with migration, and those at ?3103 au result primarily from turbulent fragmentation. We also find that MFs/CFs may rise from Class 0 to Flat Spectrum protostars between 100 and 103 au in regions of high young stellar object density. This finding may be evidence for the migration of companions from >103 au to <103 au, and that some companions between 103 and 104 au must be (or become) unbound. © 2022. The Author(s). Published by the American Astronomical Society. ; Open access journal ; This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 0004-637X |
| Relation: | Tobin, J. J., Offner, S. S. R., Kratter, K. M., Megeath, S. T., Sheehan, P. D., Looney, L. W., Diaz-Rodriguez, A. K., Osorio, M., Anglada, G., Sadavoy, S. I., Furlan, E., Segura-Cox, D., Karnath, N., Van ’T Hoff, M. L. R., Van Dishoeck, E. F., Li, Z.-Y., Sharma, R., Stutz, A. M., & Tychoniec, Ł. (2022). The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. V. A Characterization of Protostellar Multiplicity. Astrophysical Journal.; http://hdl.handle.net/10150/663943; Astrophysical Journal |
| DOI: | 10.3847/1538-4357/ac36d2 |
| الاتاحة: | http://hdl.handle.net/10150/663943 https://doi.org/10.3847/1538-4357/ac36d2 |
| Rights: | Copyright © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. ; https://creativecommons.org/licenses/by/4.0/ |
| رقم الانضمام: | edsbas.5C5BF461 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 0004637X |
|---|---|
| DOI: | 10.3847/1538-4357/ac36d2 |