First Results from the LSST Shadow Survey: The Restless Luminous Blue Variable AT2017des in the Virgo-Cluster Galaxy, NGC4532. Ransome, C. L., Subrayan, B. M., Sand, D. J., Hsu, B., Hall, X. J., Pearson, J., Bostroem, K. A., Andrews, J. E., Vinko, J., Wheeler, J. C., Noel, P., Hu, L., Cabrera, T., Valenti, S., Jacobson-Galan, W. V., Smith, N., Filippenko, A. V., Aghakhanloo, M., Andreoni, I., Andrews, M., Arcavi, I., Baer-Way, R., Beasor, E. R., Berger, E., Bianco, F. B., Blanchard, P., Brink, T. G., Chaini, S., Crawford, A., Dong, Y., Farah, J., Franz, N., Gomez, S., Graham, M. L., Hiramatsu, D., Horti-David, A., Hosseinzadeh, G., Howell, D. A., James, P. A., Jha, S. W., Kilpatrick, C. D., Kwok, L. A., Lamb, G. P., Lopes, A. R., Lundquist, M., Martinez-Vasquez, C. E., Matheson, T., McCully, C., Modjaz, M., Paek, G. S. H., Palmese, A., Patel, A., Pledger, J. L., Ravi, A. P., Rho, J., Sarneczky, K., Shrestha, M., Smith, R., Castelli, A. V. S., Soraisam, M., Strader, J., Valdes, F., Vasylyev, S., Villar, V. A., Vivas, A. K., Wang, L., Wyatt, S. D., Wynn, K., & Zheng, W. 2026. Version Number: 1![First Results from the LSST Shadow Survey: The Restless Luminous Blue Variable AT2017des in the Virgo-Cluster Galaxy, NGC4532 [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex The Legacy Survey of Space and Time (LSST) will start in late-summer 2026, revolutionizing transient astronomy. Here, we present the Dark Energy Camera (DECam) Shadow Survey, which is designed to maximize the science potential of LSST by shadowing LSST observations of local galaxycluster fields, producing a nightly cadence of these fields. The Shadow Survey will discover extremely young supernovae (SNe), SN precursors, as well as other explosive transients and exotic phenomena, helping to characterize such transients at unprecedented cadence and depth when combined with LSST. We describe our workflow, pipeline, public data releases, and candidate vetting. As an early result of Shadow, we present the fitful luminous blue variable (LBV) eruptions of AT 2017des in the VirgoCluster galaxy NGC 4532. AT 2017des has short-timescale variability (of order 10 days), peaking at around Mr = −12.5 mag, brighter than normal LBVs, and similar to the more extreme flaring of hot LBVs/SN impostors such as SN 2000ch, AT 2016blu, and the precursor activity of SN 2009ip. Our spectral time-series reveals features typical of these hot LBVs and SN impostors/precursors. Combining our data with long-baseline photometry from additional observatories, we find that the peaks of the outbursts of AT 2017des are getting brighter over time, with 2026 peak fluxes being up to 5 times greater than in 2023 and an average brightening of ∼ 0.05 mag yr−1. The peaks of AT 2017des are more luminous than those of most other LBVs, only being fainter than bright precursors such as SN 2009ip, and extreme SN impostors such as AT 2016blu. AT 2017des may therefore be “ramping up” to a terminal explosion.
@misc{ransome_first_2026,
title = {First {Results} from the {LSST} {Shadow} {Survey}: {The} {Restless} {Luminous} {Blue} {Variable} {AT2017des} in the {Virgo}-{Cluster} {Galaxy}, {NGC4532}},
copyright = {Creative Commons Attribution 4.0 International},
shorttitle = {First {Results} from the {LSST} {Shadow} {Survey}},
url = {https://arxiv.org/abs/2606.23784},
doi = {10.48550/ARXIV.2606.23784},
abstract = {The Legacy Survey of Space and Time (LSST) will start in late-summer 2026, revolutionizing transient astronomy. Here, we present the Dark Energy Camera (DECam) Shadow Survey, which is designed to maximize the science potential of LSST by shadowing LSST observations of local galaxycluster fields, producing a nightly cadence of these fields. The Shadow Survey will discover extremely young supernovae (SNe), SN precursors, as well as other explosive transients and exotic phenomena, helping to characterize such transients at unprecedented cadence and depth when combined with LSST. We describe our workflow, pipeline, public data releases, and candidate vetting. As an early result of Shadow, we present the fitful luminous blue variable (LBV) eruptions of AT 2017des in the VirgoCluster galaxy NGC 4532. AT 2017des has short-timescale variability (of order 10 days), peaking at around Mr = −12.5 mag, brighter than normal LBVs, and similar to the more extreme flaring of hot LBVs/SN impostors such as SN 2000ch, AT 2016blu, and the precursor activity of SN 2009ip. Our spectral time-series reveals features typical of these hot LBVs and SN impostors/precursors. Combining our data with long-baseline photometry from additional observatories, we find that the peaks of the outbursts of AT 2017des are getting brighter over time, with 2026 peak fluxes being up to 5 times greater than in 2023 and an average brightening of ∼ 0.05 mag yr−1. The peaks of AT 2017des are more luminous than those of most other LBVs, only being fainter than bright precursors such as SN 2009ip, and extreme SN impostors such as AT 2016blu. AT 2017des may therefore be “ramping up” to a terminal explosion.},
language = {en},
urldate = {2026-07-06},
publisher = {arXiv},
author = {Ransome, Conor L. and Subrayan, Bhagya M. and Sand, David J. and Hsu, Brian and Hall, Xander J. and Pearson, Jeniveve and Bostroem, K. Azalee and Andrews, Jennifer E. and Vinko, Joszef and Wheeler, J. Craig and Noel, Phillip and Hu, Lei and Cabrera, Tomas and Valenti, Stefano and Jacobson-Galan, Wynn V. and Smith, Nathan and Filippenko, Alexei V. and Aghakhanloo, Mojgan and Andreoni, Igor and Andrews, Moira and Arcavi, Iair and Baer-Way, Raphael and Beasor, Emma R. and Berger, Edo and Bianco, Federica B. and Blanchard, Peter and Brink, Thomas G. and Chaini, Siddarth and Crawford, Adrian and Dong, Yize and Farah, Joseph and Franz, Noah and Gomez, Sebastian and Graham, Melissa L. and Hiramatsu, Daichi and Horti-David, Agoston and Hosseinzadeh, Griffin and Howell, D. Andrew and James, Philip A. and Jha, Saurabh W. and Kilpatrick, Charles D. and Kwok, Lindsey A. and Lamb, Gavin P. and Lopes, Amanda R. and Lundquist, Michael and Martinez-Vasquez, Clara E. and Matheson, Thomas and McCully, Curtis and Modjaz, Maryam and Paek, Gregory S. H. and Palmese, Antonella and Patel, Avi and Pledger, Joanne L. and Ravi, Aravind P. and Rho, Jeonghee and Sarneczky, Krisztian and Shrestha, Manisha and Smith, Richard and Castelli, Analia V. Smith and Soraisam, Monika and Strader, Jay and Valdes, Francisco and Vasylyev, Sergiy and Villar, V. Ashley and Vivas, A. Katherina and Wang, Lifan and Wyatt, Samuel D. and Wynn, Kathryn and Zheng, WeiKang},
year = {2026},
note = {Version Number: 1},
keywords = {Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, High Energy Astrophysical Phenomena (astro-ph.HE), Solar and Stellar Astrophysics (astro-ph.SR)},
}
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The Shadow Survey will discover extremely young supernovae (SNe), SN precursors, as well as other explosive transients and exotic phenomena, helping to characterize such transients at unprecedented cadence and depth when combined with LSST. We describe our workflow, pipeline, public data releases, and candidate vetting. As an early result of Shadow, we present the fitful luminous blue variable (LBV) eruptions of AT 2017des in the VirgoCluster galaxy NGC 4532. AT 2017des has short-timescale variability (of order 10 days), peaking at around Mr = −12.5 mag, brighter than normal LBVs, and similar to the more extreme flaring of hot LBVs/SN impostors such as SN 2000ch, AT 2016blu, and the precursor activity of SN 2009ip. Our spectral time-series reveals features typical of these hot LBVs and SN impostors/precursors. 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Here, we present the Dark Energy Camera (DECam) Shadow Survey, which is designed to maximize the science potential of LSST by shadowing LSST observations of local galaxycluster fields, producing a nightly cadence of these fields. The Shadow Survey will discover extremely young supernovae (SNe), SN precursors, as well as other explosive transients and exotic phenomena, helping to characterize such transients at unprecedented cadence and depth when combined with LSST. We describe our workflow, pipeline, public data releases, and candidate vetting. As an early result of Shadow, we present the fitful luminous blue variable (LBV) eruptions of AT 2017des in the VirgoCluster galaxy NGC 4532. AT 2017des has short-timescale variability (of order 10 days), peaking at around Mr = −12.5 mag, brighter than normal LBVs, and similar to the more extreme flaring of hot LBVs/SN impostors such as SN 2000ch, AT 2016blu, and the precursor activity of SN 2009ip. Our spectral time-series reveals features typical of these hot LBVs and SN impostors/precursors. Combining our data with long-baseline photometry from additional observatories, we find that the peaks of the outbursts of AT 2017des are getting brighter over time, with 2026 peak fluxes being up to 5 times greater than in 2023 and an average brightening of ∼ 0.05 mag yr−1. The peaks of AT 2017des are more luminous than those of most other LBVs, only being fainter than bright precursors such as SN 2009ip, and extreme SN impostors such as AT 2016blu. AT 2017des may therefore be “ramping up” to a terminal explosion.},\n\tlanguage = {en},\n\turldate = {2026-07-06},\n\tpublisher = {arXiv},\n\tauthor = {Ransome, Conor L. and Subrayan, Bhagya M. and Sand, David J. and Hsu, Brian and Hall, Xander J. and Pearson, Jeniveve and Bostroem, K. Azalee and Andrews, Jennifer E. and Vinko, Joszef and Wheeler, J. 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