| Name: | Manoj Puravankara |
| Affiliation: | Tata Institute of Fundamental Research, Mumbai |
| Conference ID : | ASI2024_257 |
| Title : | Investigating Protostellar Accretion and Outflow: JWST NIRSpec and MIRI IFU Mapping of Young Protostars Across the Mass Spectrum |
| Authors : | Manoj Puravankara, Mayank Narang, Himanshu Tyagi, Sam Federman, Adam Rubinstein, Tom Megeath, Dan Watson, Rob Gutermuth and the IPA team
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| Authors Affiliation: | 1. Manoj Puravankara, Himanshu Tyagi (Tata Institute of Fundamental Research, Mumbai, India)
2. Mayank Narang (Academia Sinica Institute of Astronomy & Astrophysics, Taipei, Taiwan)
3. Sam Federman, Tom Megeath (University of Toledo, Toledo, USA)
4. Adam Rubinstein, Dan Watson (University of Rochester, Rochester, USA)
5. Rob Gutermuth (University of Massachusetts Amherst, Amherst, MA, USA) |
| Mode of Presentation: | Poster |
| Abstract Category : | Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Abstract : | The Investigating Protostellar Accretion (IPA) is a medium-sized cycle 1 GO program that has obtained NIRSpec and MIRI MRS IFU observations of five deeply embedded protostars with luminosities ranging from 0.2 to 10000 L_sun and masses of 0.12 to 10 M_sun. We will present our program's complete dataset for all five sources for the first time: NIRSpec and MIRI MRS spectral imaging in the 2.9-28 micron range, with a spectral resolution of R ~ 1000-3000 and a spatial resolution down to scales as small as 30 au. Our infrared spectral (line and continuum) maps with exquisite spatial resolution reveal previously unseen details of the interaction between accretion-driven jets and outflows and the innermost envelope of the protostars. Collimated ionic (seen in [Fe II], [Ne II]) jets with velocities ~100 km/s are detected in all sources. We report the discovery of collimated jet in the lowest mass and luminosity source, even in the quiescent accretion phase, with a measured accretion rate of ~10^-9 solar mass/year and an associated mass loss rate of ~10^-10 solar mass/year. Some of the outflow knots show emission from CO and H2, indicating the presence of molecules in primarily atomic/ionic jets. Gas phase ro-vib emissions from CO appear to arise from jet/outflow shocks, in addition to inner protostellar disks. Cavity walls are well delineated in scattered light; interestingly, wide-angled outflows traced by molecular hydrogen show opening angles somewhat smaller than that of the cavity walls, suggesting they are well inside the cavity. The composition and the spatial distribution of various ice species in the higher luminosity sources show evidence for thermal processing. We will discuss how the measured properties of the jets and outflows and their interactions with the protostellar stellar environment vary based on protostellar mass and luminosity. |
