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, generally considered the prototypical Class 0 source. We explore the consequences of new ALMA Band 9 data on the spectral energy distribution (SED) of VLA 1623−2417 and their inferred nature. Using dust continuum observations spanning from centimeter to near-infrared wavelengths, the SED of each component in VLA 1623−2417 is constructed and analysed. The ALMA Band 9 data presented here 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. The results presented here 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 fraction 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.
@article{arxiv.1807.00640,
title = {Revised SED of the triple protostellar system VLA 1623-2417},
author = {Nadia M. Murillo and Daniel Harsono and Melissa McClure and Shih-Ping Lai and Michiel R. Hogerheijde},
journal= {arXiv preprint arXiv:1807.00640},
year = {2018}
}
Comments
6 pages, 2 figures, accepted to A&A letters to the editor