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Abstract We present Atacama Large Millimeter Array band 6/7 (1.3 mm/0.87 mm) and Very Large Array Ka-band (9 mm) observations toward NGC 2071 IR, an intermediate-mass star-forming region. We characterize the continuum and associated molecular line emission toward the most luminous protostars, i.e., IRS1 and IRS3, on ∼100 au (0.″2) scales. IRS1 is partly resolved in the millimeter and centimeter continuum, which shows a potential disk. IRS3 has a well-resolved disk appearance in the millimeter continuum and is further resolved into a close binary system separated by ∼40 au at 9 mm. Both sources exhibit clear velocity gradients across their disk major axes in multiple spectral lines including C 18 O, H 2 CO, SO, SO 2 , and complex organic molecules like CH 3 OH, 13 CH 3 OH, and CH 3 OCHO. We use an analytic method to fit the Keplerian rotation of the disks and give constraints on physical parameters with a Markov Chain Monte Carlo routine. The IRS3 binary system is estimated to have a total mass of 1.4–1.5 M ⊙ . IRS1 has a central mass of 3–5 M ⊙ based on both kinematic modeling and its spectral energy distribution, assuming that it is dominated by a single protostar. For both IRS1 and IRS3, the inferred ejection directions from different tracers, including radio jet, water maser, molecular outflow, and H 2 emission, are not always consistent, and for IRS1 these can be misaligned by ∼50°. IRS3 is better explained by a single precessing jet. A similar mechanism may be present in IRS1 as well but an unresolved multiple system in IRS1 is also possible.more » « less
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Tobin, John J.; Sheehan, Patrick D.; Reynolds, Nickalas; Megeath, S. Thomas; Osorio, Mayra; Anglada, Guillem; Díaz-Rodríguez, Ana Karla; Furlan, Elise; Kratter, Kaitlin M.; Offner, Stella S.; et al (, The Astrophysical Journal)null (Ed.)
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Tobin, John J.; Sheehan, Patrick D.; Megeath, S. Thomas; Díaz-Rodríguez, Ana Karla; Offner, Stella S.; Murillo, Nadia M.; van ’t Hoff, Merel L.; van Dishoeck, Ewine F.; Osorio, Mayra; Anglada, Guillem; et al (, The Astrophysical Journal)
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Tobin, John J.; Megeath, S. Thomas; Hoff, Merel van’t; Díaz-Rodríguez, Ana Karla; Reynolds, Nickalas; Osorio, Mayra; Anglada, Guillem; Furlan, Elise; Karnath, Nicole; Offner, Stella S.; et al (, The Astrophysical Journal)
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