IRAS 15398-3359 is a young, small, relatively cool Class 0 protostar, which is an early stage of star formation. The star is located about 47 light years from Earth. It emits weak light, which struggles to penetrate the surrounding cloud of gas and dust.
Several studies have been conducted to understand the properties and environment of this protostar using various telescopes and instruments.
Observations with ALMA
Observations with the Atacama Large Millimeter/submillimeter Array (ALMA) have revealed the presence of water around IRAS 15398-3359. The detection of H13CO+ showed a depression in its abundance, indicating the destruction of HCO+ by an enhanced water abundance, likely due to the sublimation of water ice in the inner regions of the protostellar envelope.
JWST/MIRI Observations
The James Webb Space Telescope (JWST) has observed IRAS 15398-3359 using its Mid-Infrared Instrument (MIRI). The MIRI Medium Resolution Spectroscopy (MRS) and imaging data have provided insights into the physical and chemical structure of the protostellar envelope and outflows.
More iron FE closer to the protostar ?
“The [Fe ii] and [Ne ii] emission show a collimated bipolar jet-like structure along the known outflow direction. The emission also highlights a bright
knot ∼2.500 away from the protostar toward southwest. The emission of H2 appears more extended, tracing a wide-angle outflow cavity.” (Page 13) https://arxiv.org/pdf/2208.10673.pdf
SOFIA Telescope
Multiple Outflows
Observations with the Atacama Compact Array (ACA) have revealed the presence of multiple outflows around IRAS 15398-3359.
Water Snow Line
The observations of IRAS 15398-3359 have helped confirm a hypothesis for determining the water snow line, which is the boundary where water transitions from a solid (ice) to a gas phase. This is an important feat as the water snow line plays a crucial role in the formation and evolution of protoplanetary disks and ultimately the formation of planets.
Summary
In summary, IRAS 15398-3359 is a well-studied Class 0 protostar, and observations with various telescopes and instruments have provided valuable insights into its physical and chemical properties, outflows, and the water snow line, contributing to our understanding of the early stages of star formation. IRAS 15398-3359 is currently only 0.7% of the mass of our Sun. Notably, this type of protoplanetary disk had never been observed around such a young star before.
References:
CORINOS. I. JWST/MIRI Spectroscopy and Imaging of a Class 0 Protostar IRAS 15398–3359
Yang, Yao-Lun & Green, Joel & Pontoppidan, Klaus & Bergner, Jennifer & Cleeves, L. & II, Neal & Garrod, Robin & Jin, Mihwa & Kim, Chul & Kim, Jaeyeong & Lee, Jeong-Eun & Sakai, Nami & Shingledecker, Christopher & Shope, Brielle & Tobin, John & Dishoeck, Ewine.
- December 2022
- The Astrophysical Journal Letters 941(1):L13
- December 2022
- 941(1):L13
- License
- CC BY 4.0
Water around IRAS15398-3359 observed with ALMA
Bjerkeli, P. & Jørgensen, J. & Bergin, Edwin & Frimann, Søren & Harsono, Daniel & Jacobsen, Steffen & Lindberg, Johan & Persson, M. & Sakai, Nami & Dishoeck, E. & Visser, Ramonda & Yamamoto, S..
- August 2016
- Astronomy and Astrophysics 595
- August 2016
- 595
DOI:10.1051/0004-6361/201628795
https://www.researchgate.net/publication/306376908_Water_around_IRAS15398-3359_observed_with_ALMA
Multiple Outflows around a Single Protostar IRAS 15398−3359
Jinshi Sai, Hsi-Wei Yen, Masahiro N. Machida, Nagayoshi Ohashi, Yusuke Aso, Anaëlle J. Maury, Sébastien Maret
https://arxiv.org/abs/2403.10857
Water in star-forming regions with Herschel (WISH)
J. C. Mottram, L. E. Kristensen, E. F. van Dishoeck, S. Bruderer, I. San José-García, A. Karska, R. Visser, G. Santangelo, A. O. Benz, E. A. Bergin, P. Caselli, F. Herpin, M. R. Hogerheijde, D. Johnstone, T. A. van Kempen, R. Liseau, B. Nisini, M. Tafalla, F. F. S. van der Tak and F. Wyrowski
| Issue | A&AVolume 572, December 2014 |
|---|---|
| Article Number | A21 |
| Number of page(s) | 49 |
| Section | Interstellar and circumstellar matter |
| DOI | https://doi.org/10.1051/0004-6361/201424267 |
| Published online | 21 November 2014 |
https://www.aanda.org/articles/aa/full_html/2014/12/aa24267-14/aa24267-14.html
CORINOS I: JWST/MIRI Spectroscopy and Imaging of a Class 0 protostar IRAS 15398−3359
https://arxiv.org/pdf/2208.10673.pdf
Circular Astronomy 