Context : VLA 1623 - 2417 is a triple protostellar system deeply embedded in Ophiuchus A .
Sources A and B have a separation of 1.1 \arcsec , making their study difficult beyond the submillimeter regime .
Lack of circumstellar gas emission suggested that VLA 1623 B has a very cold envelope and is much younger than source A , 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 : Using dust continuum observations spanning from centimeter to near-infrared wavelengths , the SED of each component in VLA 1623 - 2417 is constructed and analysed .

Results : The ALMA Band 9 data presented here show that the SED of VLA 1623 - 2417 B does not peak at 850 \mu m as previously expected , but instead presents the same shape as VLA 1623 - 2417 A at wavelengths shorter than 450 \mu m .

Conclusions : 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 \lambda~ { } < 450 \mu m. These results , however , do not explain the lack of circumstellar gas emission and puzzling nature of VLA 1623 - 2417 B .