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  • Lunnan, R. (author)

Two New Calcium-rich Gap Transients in Group and Cluster Environments

  • Article/chapterEnglish2017

Publisher, publication year, extent ...

  • 2017-02-08
  • American Astronomical Society,2017
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-142510
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-142510URI
  • https://doi.org/10.3847/1538-4357/836/1/60DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • We present the Palomar Transient Factory discoveries and the photometric and spectroscopic observations of PTF11kmb and PTF12bho. We show that both transients have properties consistent with the class of calcium-rich gap transients, specifically lower peak luminosities and rapid evolution compared to ordinary supernovae, and a nebular spectrum dominated by [Ca II] emission. A striking feature of both transients is their host environments: PTF12bho is an intracluster transient in the Coma Cluster, while PTF11kmb is located in a loose galaxy group, at a physical offset similar to 150 kpc from the most likely host galaxy. Deep Subaru imaging of PTF12bho rules out an underlying host system to a limit of M-R > -8.0 mag, while Hubble Space Telescope imaging of PTF11kmb reveals a marginal counterpart that, if real, could be either a background galaxy or a globular cluster. We show that the offset distribution of Ca-rich gap transients is significantly more extreme than that seen for SNe Ia or even short-hard gamma-ray bursts (sGRBs). Thus, if the offsets are caused by a kick, they require higher kick velocities and/or longer merger times than sGRBs. We also show that almost all Ca-rich transients found to date are in group and cluster environments with elliptical host galaxies, indicating a very old progenitor population; the remote locations could partially be explained by these environments having the largest fraction of stars in the intragroup/intracluster light following galaxy-galaxy interactions.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Kasliwal, M. M. (author)
  • Cao, Y. (author)
  • Hangard, LauraStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)lhang (author)
  • Yaron, O. (author)
  • Parrent, J. T. (author)
  • McCully, C. (author)
  • Gal-Yam, A. (author)
  • Mulchaey, J. S. (author)
  • Ben-Ami, S. (author)
  • Filippenko, A. V. (author)
  • Fremling, ChristofferStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)chfr1801 (author)
  • Fruchter, A. S. (author)
  • Howell, D. A. (author)
  • Koda, J. (author)
  • Kupfer, T. (author)
  • Kulkarni, S. R. (author)
  • Laher, R. (author)
  • Masci, F. (author)
  • Nugent, P. E. (author)
  • Ofek, E. O. (author)
  • Yagi, M. (author)
  • Yan, Lin (author)
  • Stockholms universitetFysikum (creator_code:org_t)

Related titles

  • In:Astrophysical Journal: American Astronomical Society836:10004-637X1538-4357

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