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iPTF 16hgs :
iPTF 16hgs : A Double-peaked Ca-rich Gap Transient in a Metal-poor, Star-forming Dwarf Galaxy
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- De, Kishalay (författare)
- CALTECH, Cahill Ctr Astrophys, 1200 East Calif Blvd, Pasadena, CA 91125 USA
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- Kasliwal, Mansi M. (författare)
- CALTECH, Cahill Ctr Astrophys, 1200 East Calif Blvd, Pasadena, CA 91125 USA
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- Cantwell, Therese (författare)
- Univ Manchester, Jodrell Bank Ctr Astrophys, Sch Phys & Astron, Alan Turing Bldg,Oxford Rd, Manchester M13 9PL, Lancs, England
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- Cao, Yi (författare)
- Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA
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- Cenko, S. Bradley (författare)
- NASA, Astrophys Sci Div, Goddard Space Flight Ctr, Mail Code 661, Greenbelt, MD 20771 USA;Univ Maryland, Joint Space Sci Inst, College Pk, MD 20742 USA
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- Gal-Yam, Avishay (författare)
- Weizmann Inst Sci, Dept Particle Phys & Astrophys, Fac Phys, IL-76100 Rehovot, Israel
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- Johansson, Joel, Dr, 1984- (författare)
- Uppsala universitet,Observationell astrofysik
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- Kong, Albert (författare)
- Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan;Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan
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- Kulkarni, Shrinivas R. (författare)
- CALTECH, Cahill Ctr Astrophys, 1200 East Calif Blvd, Pasadena, CA 91125 USA
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- Lunnan, Ragnhild (författare)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Dept Astron, Oskar Klein Ctr, SE-10691 Stockholm, Sweden
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- Masci, Frank (författare)
- CALTECH, Infrared Proc & Anal Ctr, MS 100-22, Pasadena, CA 91125 USA
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Matuszewski, Matt (författare)
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- Mooley, Kunal P. (författare)
- CALTECH, Cahill Ctr Astrophys, 1200 East Calif Blvd, Pasadena, CA 91125 USA
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- Neill, James D. (författare)
- CALTECH, Cahill Ctr Astrophys, 1200 East Calif Blvd, Pasadena, CA 91125 USA
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- Nugent, Peter E. (författare)
- Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA;Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
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- Ofek, Eran O. (författare)
- Weizmann Inst Sci, Dept Particle Phys & Astrophys, Fac Phys, IL-76100 Rehovot, Israel
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- Perrott, Yvette (författare)
- Cavendish Lab, Astrophys Grp, 19 JJ Thomson Ave, Cambridge CB3 0HE, England
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- Rebbapragada, Umaa D. (författare)
- CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
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- Rubin, Adam (författare)
- Weizmann Inst Sci, Dept Particle Phys & Astrophys, Fac Phys, IL-76100 Rehovot, Israel
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- O' Sullivan, Donal (författare)
- CALTECH, Cahill Ctr Astrophys, 1200 East Calif Blvd, Pasadena, CA 91125 USA
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- Yaron, Ofer (författare)
- Weizmann Inst Sci, Dept Particle Phys & Astrophys, Fac Phys, IL-76100 Rehovot, Israel
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(creator_code:org_t)
- 2018-10-15
- 2018
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 866:1
- Relaterad länk:
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https://www.research...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Calcium-rich gap transients represent an intriguing new class of faint and fast-evolving supernovae that exhibit strong [Ca II] emission in their nebular phase spectra. In this paper, we present the discovery and follow-up observations of a faint and fast-evolving transient, iPTF 16hgs, that exhibited a double-peaked light curve. Exhibiting a Type Ib spectrum in the photospheric phase and an early transition to a [Ca II] dominated nebular phase, iPTF 16hgs shows properties consistent with the class of Ca-rich gap transients, with two important exceptions. First, while the second peak of the light curve is similar to other Ca-rich gap transients, the first blue and fast-fading peak (declining over approximate to 2 days) is unique to this source. Second, we find that iPTF 16hgs occurred in the outskirts (projected offset of approximate to 6 kpc approximate to 1.9 R-eff) of a low-metallicity (approximate to 0.4 Z(circle dot)), star-forming, dwarf spiral galaxy. Deep limits from late-time radio observations suggest a low-density environment for the source. If iPTF 16hgs shares explosion physics with the class of Ca-rich gap transients, the first peak can be explained by the presence of 0.01 M-circle dot of Ni-56 in the outer layers the ejecta, reminiscent of some models of He-shell detonations on WDs. However, if iPTF 16hgs is physically unrelated to the class, the first peak is consistent with shock cooling emission (of an envelope with a mass of approximate to 0.08 M-circle dot and radius of approximate to 13 R-circle dot) in a core-collapse explosion of a highly stripped massive star in a close binary system.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- supernovae: general
- supernovae: individual (iPTF 16hgs)
- surveys
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De, Kishalay
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Kasliwal, Mansi ...
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Cantwell, Theres ...
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Cao, Yi
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Cenko, S. Bradle ...
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Gal-Yam, Avishay
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Johansson, Joel, ...
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Kong, Albert
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Kulkarni, Shrini ...
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Lunnan, Ragnhild
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Masci, Frank
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Matuszewski, Mat ...
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Mooley, Kunal P.
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Neill, James D.
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Nugent, Peter E.
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Ofek, Eran O.
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Perrott, Yvette
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Rebbapragada, Um ...
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Rubin, Adam
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O' Sullivan, Don ...
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Yaron, Ofer
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