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request for spectra of possible supernova AT2017haf

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  • 2 October 2017 at 12:34 pm #573857
    Robin Leadbeater
    Participant
    I have had a request from a professional team for spectra to classify possible supernova AT2017haf
    which was discovered 2017-09-30 on the rise at mag 16
    They are intensively following up all nearby type 1a supernova and if it is found to be 1a before Wednesday they have telescope time available. The weather forecast is not good here though so is there anyone else who would like to try for it?  If you get a spectrum I can assist in the classification.
     
    The same team are also following up my recent type 1a classifications SN2017gxq and  SN2017gjn
     
    Cheers

    Robin
    3 October 2017 at 5:43 pm #578599
    Kevin Gurney
    Participant

    Is Thursday too late for this?

    There is clear sky forecast here, although I have a load of teaching Thursday/Friday (so mechanics of life may preclude…)

    I can see the galaxy in the DSS image overlaid in CdC but coords differ from those advertised (maybe an epoch issue?). Anyway, I’ll let you know if I am game for it later this week

    Kevin

    3 October 2017 at 9:52 pm #578601
    Robin Leadbeater
    Participant

    Hi Kevin,

    I have just seen that the iPTF team have now classified it (type 1a) so no need to go for it, unless you want to of course.

    https://wis-tns.weizmann.ac.il/object/2017haf

    Interestingly the “SED machine” spectrograph they use is even lower resolution than mine. They are definitely a rival 😉

    The location looks spot on to me in CdC if I overlay the DSS image so probably an epoch issue. (The TNS coordinates are J2000). It is quite close to the galaxy core though so separating it from the galaxy could be a problem.

    Cheers

    Robin 

    3 October 2017 at 11:03 pm #578603
    Kevin Gurney
    Participant

    Hi Robin

    I see its mag 16 – I struggled with 3C-273 at mag 13 (see my personal page) … Do you use an Alpy or lower res instrument?

    Kevin

    6 October 2017 at 8:11 pm #578627
    Robin Leadbeater
    Participant

    Hi Kevin,

    For supernovae I use a specially modified ALPY with a lower dispersion GRISM which allows me to  get down to ~mag 17.5 compared with ~mag 15.5 with the standard ALPY with my C11

    http://www.threehillsobservatory.co.uk/astro/spectroscopy_20.htm

    Cheers

    Robin

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