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Two New Calcium-ric...
Two New Calcium-rich Gap Transients in Group and Cluster Environments
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Lunnan, R. (author)
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Kasliwal, M. M. (author)
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Cao, Y. (author)
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- Hangard, Laura (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Yaron, O. (author)
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Parrent, J. T. (author)
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McCully, C. (author)
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Gal-Yam, A. (author)
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Mulchaey, J. S. (author)
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Ben-Ami, S. (author)
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Filippenko, A. V. (author)
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- Fremling, Christoffer (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Fruchter, A. S. (author)
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Howell, D. A. (author)
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Koda, J. (author)
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Kupfer, T. (author)
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Kulkarni, S. R. (author)
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Laher, R. (author)
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Masci, F. (author)
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Nugent, P. E. (author)
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Ofek, E. O. (author)
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Yagi, M. (author)
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Yan, Lin (author)
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(creator_code:org_t)
- 2017-02-08
- 2017
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 836:1
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- supernovae: general
- supernovae: individual (PTF11kmb
- PTF12bho
- PTF10hcw
- SN 2005E)
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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Lunnan, R.
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Kasliwal, M. M.
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Cao, Y.
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Hangard, Laura
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Yaron, O.
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Parrent, J. T.
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show more...
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McCully, C.
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Gal-Yam, A.
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Mulchaey, J. S.
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Ben-Ami, S.
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Filippenko, A. V ...
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Fremling, Christ ...
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Fruchter, A. S.
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Howell, D. A.
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Koda, J.
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Kupfer, T.
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Kulkarni, S. R.
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Laher, R.
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Masci, F.
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Nugent, P. E.
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Ofek, E. O.
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Yagi, M.
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Yan, Lin
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
- Articles in the publication
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Astrophysical Jo ...
- By the university
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Stockholm University