2023-07-13
Present:
@Ramesh Bhat
@Bradley Meyers
Parul Janagal
@Christopher Lee
@Mengyao Xue
Shi Dai
@Nick Swainston (Deactivated)
Jared Moseley
Ryan Shannon
@Marcin Sokolowski (Deactivated)
Willem van Straten
Minutes
General introductions for new faces.
Ramesh's updates
General project updates
SMART data acquisition is notional complete! 1 or 2 may need re-observing in the next week.
Description papers fully published in PASA (reminder for folks not at previous meetings)
Parul's paper on J0026-1955 now accepted (congratulations!)
Proposals
ASTAC proposal for 2023B awarded; 250 kSU for Q3/4
GMRT Cycle 44; additional time granted for Pulsar 5 (best-effort), no other proposals intended this semester
MWA 10 year Project Meeting
Many PFT members presenting, Bradley giving SMART talk, Ramesh giving 10yr Overview
Chris's updates
Data acquisition and quality checking
Three observations needed to be recollected
One more may need a recollection; one has no pulsars detected yet
53 pulsars with MWAX, total of 164 with SMART
Need to double check some ephmerides/timing offsets based on J2145, but good detection otherwise
Will get most recent ephemeris from PPTA/MeerTime and see how it fairs
New MSP detection of J1555-2908 (low S/N but reasonably convincing based on 10-mins of data)
Shi: Do we have longer integration? Chris: Yes, 80-minutes at least but won't look at it just yet. 10-mins is for verification purpose. Shi: MWA data should be very helpful for studying eclipses.
J1730-2304 (reasonable), J1622-6617 (less convincing, but definitely signature in PRESTO plots, not coherent dedisp'd)
8.5 sec pulsar detected! First detection below 300 MHz?
PhD update discussion
Idea is to target Fermi unassociated sources along the GP
Also follow-up MeerTime MSP census?
Perform CDMT, acceleration/sideband search
Can probably push CDMT search up to DM of ~50 pc/cc but prohibitive for much larger
Took LOFAR data to receive MWA beamformed data (add VDIF file support)
Lots of debugging CUDA/C++
Profile of J2145-0750 looks very similar, good verification of approach vs. DSPSR
Still having issues with J0034-0534 (comparing PRESTO, DSPSR, CDMT, etc.) - may need some more expert help?
Haven't done MSP timing checks - could be instrumental? MWAX subfiles at 8-sec cadence...
Will set up meeting with WvS for deep-dive
CDMT output also seems to imprint periodic impulses in output data (dominating Fourier searches) - help?
Bradley's updates
SMART publication policy
Operates in addition to PFT and MWA policies
Aim is to provide clarity and to make things like project descriptions, paper authorship & title formats easier
Draft policy document
Bradley will circulate to SMART team after this meeting so we can converge
Database migration status
Data Central version online, still ironing out bugs. Please have a play and let me (Bradley) know if you run into problems.
Hopefully in the next few weeks!
Parul's updates
Update on J0026-1955 with uGMRT data
Significant nulling and subpulse drifting that has multiple modes
Drift rate evolution across specific mode emission which is reasonably new (at the measured level)
Classic carousel model simply doesn't work
Change in polar screening gap?
Change in spark configuration?
90% of the time, mode A2 follows a null - what could it mean?
Memory across nulls (drift rate OR subpulse phase)
Discussion items
FFA/FFT/SPS simulations and paper (Ramesh? Garvit?); Moved to next meeting
Dedispersion plans
Low and High Galactic latitude plans (Low =
|b| < 15 deg, High =|b| > 15 deg)What should be the max. searched DMs?
Should be just do FFT/FFA searches on a subset of the DM trials, SPS on all trials?
Cluster pulsars? Could be on edge of detection threshold, but in principle not that much processing required. Previous experience showed only very marginal hints of detection.