AAVSO Alert Notice 585 announces an observing campaign following up on 8 Evryscope targets to confirm debris/planetesimals transit candidates and variable stars. Please see the notice for details and observing instructions.
Many thanks, and Good observing,
Elizabeth Waagen, AAVSO HQ
Hello to all AAVSO observers,
First I would like to thank you guys for the effort you put in the our first Evryscope follow up Alert Notice 585.
That was really helpful.
Let me add a few words about the program we are pursuing with Evryscope at CTIO: the telescope is surveying all Southern stars down to g'=16mag (20k-35k epochs/year), at 2min cadence and with a long term (including all sky, cloud conditions, Moon cycle) 1% photometric level at g'=10mag.
Our AAVSO-requested observations are confirmation observations for one of our sub surveys covering WDs and hot subdwarfs, searching for transit and debris-disk-like variability. From the 5000 or so targets we’re monitoring, and for the first data analysis, only a dozen or so showed to be candidates (we’ also following-up other targets using other facilities), the rest have good light curves but no obvious variability.
Two of the targets we requested are a hot subdwarf showing debris-disk-like changes (EC 23073-6905) and a 25-hr sinusoidal pulsation/rotation curve (JL 94). The former would be the first detection of a transiting debris disk around a hot sudwarf.
Your awesome quality follow up observations plus others we got from other facilities have confirmed these two targets to be not-variable.
We expect to submit to AAVSO more targets to be followed up in the future.
So at this point in time, is the campaign complete?
From my northern location 2MASS J05144393-0848064 is just barely above alt 30 for 4-5 hours. However, if observations are no longer required, I move on to something else.
I never saw a reply to Cliff's question. I would expect that if we are willing to put in the time and effort to observe these targets that we could get an answer..