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Would need to think about that Max 🙂
It’s great fun having these speculations. We’d probably not be in the position to do so with your intense and precise data.Superhumps are characteristic of a DN superoutburst. There are indeed caused by the AD becoming elliptical. So there would need to be a series of humps, the period of which would be slightly longer than Porb. Have you measured the “hump period” to check that it is consistent with the eclipse period?
Those data are truly remarkable regarding their precision, Max. I suppose technically this is a bright outburst (no superhumps modulated with the Porb, which is too long to be a UGSU system).
I wonder if there is any way of probing (or estimating) how much of the disc goes into outburst. There is an idea that only part of the AD goes into outburst, resulting in these “stunted” outbursts. I therefore wonder if the eclipse width of this bright outburst is wider. Or perhaps this current outburst is a “normal” one, like the one 5 outbursts ago at the beginning of your second plot above, the intervening 4 being “stunted” outbursts……
I can’t believe its almost a year since the RS Oph eruption!
An MNRAS pre-print on the “Study of 2021 outburst of the recurrent nova RS Ophiuchi: Photoionization and morpho-kinematic modelling”, on ArXiv today, presents the evolution of the optical spectra of the eruption, includes amateur spectroscopy and photometry: https://arxiv.org/abs/2207.10473
In common with its CV brethren, CG Dra is determined to keep use guessing, Max!
Thanks for posting the LC showing the series of recent outbursts.Looks like you are extracting lots of interesting details and features out of your data, Max. Great to see!
I think the long term light curve covering multiple outbursts will be a good probe of how the AD changes, especially at the beginning of an outburst. That is the advantage of studying a system that outbursts so often. I say “outburst”, although it is by no means clear these are traditional DN outbursts (they are quite small and their profile is different).
A paper by Brad Schaefer submitted to MNRAS appears on ArXiv today: https://arxiv.org/abs/2206.14231#
It describes a missed eruption of U Sco in 2016That post egress brightening and subsequent drop is most intriguing Max. Testament to the high quality of your data
No problem submitting, Max. Researchers can subsequently apply any data quality selection criteria they wish. Without any data they have no choice. The other consideration is that your data, at the very least, provide a snapshot of the system status at that time.
Multiple confirmations of the eruption have appeared overnight. Appears to be around maximum (8th mag).
In the 2010 eruption, it faded one mag in a day and 6 mags in 4 days. Let’s hope we get a break in UK skies (I’ve not seen any UK obs yet)
Charts here: https://app.aavso.org/vsp/chart/?star=U%20SCO&fov=60&maglimit=14.5&resolution=150&north=up&east=left
Can be scaled/orientated to choice
