Revised SED of the triple protostellar system VLA 1623-2417
Abstract
Context. VLA 1623-2417 is a triple protostellar system deeply embedded in Ophiuchus A. Sources A and B have a separation of 1.1″, making their study difficult beyond the submillimeter regime. Lack of circumstellar gas emission suggested that VLA 1623-2417 B has a very cold envelope and is much younger than source A, which is generally considered the prototypical Class 0 source.
Aims: We explore the consequences of new ALMA Band 9 data on the spectral energy distribution (SED) of VLA 1623-2417 and their inferred nature.
Methods: We constructed and analyzed the SED of each component in VLA 1623-2417 using dust continuum observations spanning from centimeter to near-infrared wavelengths.
Results: The ALMA Band 9 data presented in this work show that the SED of VLA 1623-2417 B does not peak at 850 µm as previously expected, but instead presents the same shape as VLA 1623-2417 A at wavelengths shorter than 450 µm.
Conclusions: The results presented in this work indicate that the previous assumption that the flux in Herschel and Spitzer observations is solely dominated by VLA 1623-2417 A is not valid, and instead, VLA 1623-2417 B most likely contributes a significant portion of the flux at λ < 450 µm. These results, however, do not explain the lack of circumstellar gas emission and puzzling nature of VLA 1623-2417 B.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- July 2018
- DOI:
- 10.1051/0004-6361/201833420
- arXiv:
- arXiv:1807.00640
- Bibcode:
- 2018A&A...615L..14M
- Keywords:
-
- stars: formation;
- stars: low-mass;
- ISM: individual objects: VLA 1623-2417;
- methods: observational;
- techniques: interferometric;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 6 pages, 2 figures, accepted to A&