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Published December 1, 2023 | Published
Journal Article Open

Disk Cooling and Wind Lines as Seen in the Spectral Line Evolution of V960 Mon

  • 1. ROR icon California Institute of Technology


Abstract We follow up our photometric study of the postoutburst evolution of the FU Ori object V960 Mon with a complementary spectroscopic study at high dispersion that uses time series spectra from the Keck/HIgh Resolution Echelle Spectrograph. Consistent with the photometric results reported in Carvalho et al., we find that the spectral evolution of V960 Mon corresponds to a decrease in the temperature of the inner disk, driven by a combination of a decreasing accretion rate and an increasing inner disk radius. We also find that although the majority of the absorption lines are well matched by our accretion disk model spectrum, there are several strong absorption line families and a few emission lines that are not captured by the model. By subtracting the accretion disk model from the data at each epoch, we isolate the wind and outflow components of the system. The residuals show both broad and highly blueshifted profiles, as well as narrow and only slightly blueshifted profiles, with some lines displaying both types of features.

Copyright and License

© 2023. The Author(s). Published by the American Astronomical Society. 

Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.


We thank the Association of Amateur Variable Star Observers for their dedicated high-cadence sampling of the postoutburst lightcurve of this target, which we have reproduced in Figure 1, and discussed for multiple bands in Paper I.

We thank the anonymous referee for the detailed comments which helped improve the manuscript.


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Additional details

January 22, 2024
January 22, 2024