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  The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of orion protostars. - I. Identifying and characterizing the protostellar content of the OMC-2 FIR4 and OMC-2 FIR3 regions

Tobin, J. J., Megeath, S. T., Hoff, M. v., Díaz-Rodríguez, A. K., Reynolds, N., Osorio, M., et al. (2019). The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of orion protostars. - I. Identifying and characterizing the protostellar content of the OMC-2 FIR4 and OMC-2 FIR3 regions. The Astrophysical Journal, 886(1): 6. doi:10.3847/1538-4357/ab498f.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-7A08-A Version Permalink: http://hdl.handle.net/21.11116/0000-0005-7A09-9
Genre: Journal Article

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Tobin, John J., Author
Megeath, S. Thomas, Author
Hoff, Merel van’t, Author
Díaz-Rodríguez, Ana Karla, Author
Reynolds, Nickalas, Author
Osorio, Mayra, Author
Anglada, Guillem, Author
Furlan, Elise, Author
Karnath, Nicole, Author
Offner, Stella S. R., Author
Sheehan, Patrick D., Author
Sadavoy, Sarah I., Author
Stutz, Amelia M., Author
Fischer, William J., Author
Kama, Mihkel, Author
Persson, Magnus, Author
Francesco, James Di, Author
Looney, Leslie W., Author
Watson, Dan M., Author
Li, Zhi-Yun, Author
Stephens, Ian, AuthorChandler, Claire J., AuthorCox, Erin, AuthorDunham, Michael M., AuthorKratter, Kaitlin, AuthorKounkel, Marina, AuthorMazur, Brian, AuthorMurillo, Nadia M., AuthorPatel, Lisa, AuthorPerez, Laura, AuthorSegura-Cox, Dominique1, Author              Sharma, Rajeeb, AuthorTychoniec, Łukasz, AuthorWyrowski, Friedrich, Author more..
Affiliations:
1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Abstract: We present Atacama Large Millimeter/submillimeter Array (0.87 mm) and Very Large Array (9 mm) observations toward OMC-2 FIR4 and OMC-2 FIR3 within the Orion integral-shaped filament, thought to be two of the nearest regions of intermediate-mass star formation. We characterize the continuum sources within these regions on ~40 au (0.〞1) scales and associated molecular line emission at a factor of ~30 better resolution than previous observations at similar wavelengths. We identify six compact continuum sources within OMC-2 FIR4, four in OMC-2 FIR3, and one additional source just outside OMC-2 FIR4. This continuum emission is tracing the inner envelope and/or disk emission on less than 100 au scales. HOPS-108 is the only protostar in OMC-2 FIR4 that exhibits emission from high-excitation transitions of complex organic molecules (e.g., methanol and other lines) coincident with the continuum emission. HOPS-370 in OMC-2 FIR3, with L ~ 360 L , also exhibits emission from high-excitation methanol and other lines. The methanol emission toward these two protostars is indicative of temperatures high enough to thermally evaporate it from icy dust grains; overall, these protostars have characteristics similar to hot corinos. We do not identify a clear outflow from HOPS-108 in 12CO, but we find evidence of interaction between the outflow/jet from HOPS-370 and the OMC-2 FIR4 region. A multitude of observational constraints indicate that HOPS-108 is likely a low- to intermediate-mass protostar in its main mass accretion phase and is the most luminous protostar in OMC-2 FIR4. The high-resolution data presented here are essential for disentangling the embedded protostars from their surrounding dusty environments and characterizing them.

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 Dates: 2019-11-13
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab498f
Other: LOCALID: 3186733
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 886 (1) Sequence Number: 6 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3