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Sn2008ha - unique supernova

  1. Apr 16, 2009 #1


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    The story about SN2008ha
    http://deer-pond-observatorie.wetpaint.com/page/The+story+about+SN2008ha?t=anon [Broken]
    How Caroline became the youngest person to discover a supernova

    On November 13th 2008, Caroline Moore a member of the Puckett Observatory Supernova Search team was recognized by the International Astronomical Union for discovering a supernova. Their discovery has been named Supernova 2008ha in galaxy UGC 12682. And at the ripe old age of 14, Caroline has also been recognized as most likely the youngest person to discover a supernova.

    iOptron Announces Caroline Moore as the Young Astronomer of the Year
    Supernova 2008ha is in UGC 12682, a galaxy that is eating itself and where Supernovae normally do not occur. This is one of the things the makes Caroline's discovery so unique. It is also a type 1a supernova and possibly the least luminous supernovae ever observed.

    http://www.supernovae.net/sn2008/sn2008ha.html [Broken]

    The Puckett Observatory is a Private facility owned and operated by Tim Puckett. The observatory is located in the North Georgia mountains and is dedicated to the study of comets and the discovery of supernovae.

    This supernova is attracting a lot of interest.

    SN 2008ha: An Extremely Low Luminosity and Extremely Low Energy Supernova

    Authors: Ryan J. Foley, Ryan Chornock, Alexei V. Filippenko, Mohan Ganeshalingam, Robert P. Kirshner, Weidong Li, S. Bradley Cenko, Pete Challis, Andrew S. Friedman, Maryam Modjaz, Jeffrey M. Silverman, W. Michael Wood-Vasey
    (Submitted on 16 Feb 2009 (v1), last revised 23 Feb 2009 (this version, v2))

    A low energy core-collapse supernova without a hydrogen envelope

    Stefano Valenti (1), Andrea Pastorello (1), Enrico Cappellaro (2), Stefano Benetti (2), Paolo Mazzali (2,3), Jose Manteca (4), Stefan Taubenberger (3), Nancy Elias-Rosa (5), Rafael Ferrando (6), Avet Harutyunyan (2,7), Veli-Pekka Hentunen (8,9), Markku Nissinen (8), Elena Pian (10), Massimo Turatto (11), Luca Zampieri (2), Stephen J. Smartt (1). ((1) Queen's University Belfast, (2) INAF-OAPD Padova, (3) MPA Garching, (4) Begues Observatory Barcellona, (5) Caltech Pasadena, (6) Arguines Observatory Segorbe, (7) TNG Santa Cruz de la Palma, (8) Taurus Hill Observatory Kangaslampi, (9) Tuorla Observatory Piikkio, (10) INAF-OAT Trieste, (11) INAC-OACT Catania)
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Apr 17, 2009 #2


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    Fascinating. Thanks for the link. Learn something new every day.
  4. Jun 3, 2009 #3
    The statement about low luminosity confuses me. Perhaps I'm confusing terms such as "luminosity" and "peak light output" or "brightness", but I thought that all type 1a SNe were considered to have pretty much equal light output which is what allows them to be used as "standard candles" for measuring distance. I thought at first that what they meant was that this SN is just very far away so appears very dim, but the text of the paper seems to imply that this SN is unusual for a type 1a. Does this maybe suggest that type 1a's cannot be relied on for this purpose?
    I'm not a professional, so maybe I'm misinterpreting things.
  5. Jun 3, 2009 #4


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    The papers Astronuc referenced indicate some dispute regarding the nature of this supernova. If it is a core collapse supernova, it is not your typical '1a' supernova, where hydrogen gas accretes on the surface of a white dwarf until it 'detonates' upon reaching a critical mass. It could still, however, be a 1a where the accretion material was unusually hydrogen deficient. That is what is being debated IMO.
  6. Jun 4, 2009 #5
    http://supernovae.in2p3.fr/~bongard/SeriousSeb/Revue_presse/revue_presse_2009-01-21.txt" [Broken]

    Thanks for your reply. This piqued my interest, so I did a little more digging and found the above link. The first two of the abstracts refer to this supernova.

    Note especially the last sentence of the first one:

    This one proposes reclassifying it as a type 1b/c:

    Anyway, it got me to learning a bit more about all this.
    Last edited by a moderator: May 4, 2017
  7. Jun 4, 2009 #6


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    You have dug deeper than I, but, found the essential nature of the discussion. Good links.
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