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The Zwicky Transien...
The Zwicky Transient Facility Census of the Local Universe. I. Systematic Search for Calcium-rich Gap Transients Reveals Three Related Spectroscopic Subclasses
- Article/chapterEnglish2020
Publisher, publication year, extent ...
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2020-12-11
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American Astronomical Society,2020
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Numbers
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LIBRIS-ID:oai:DiVA.org:su-189426
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-189426URI
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https://doi.org/10.3847/1538-4357/abb45cDOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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Using the Zwicky Transient Facility alert stream, we are conducting a large spectroscopic campaign to construct a complete, volume-limited sample of transients brighter than 20 mag, and coincident within 100 '' of galaxies in the Census of the Local Universe catalog. We describe the experiment design and spectroscopic completeness from the first 16 months of operations, which have classified 754 supernovae. We present results from a systematic search for calcium-rich gap transients in the sample of 22 low-luminosity (peak absolute magnitude M > -17), hydrogen-poor events found in the experiment. We report the detection of eight new events, and constrain their volumetric rate to greater than or similar to 15% +/- 5% of the SN Ia rate. Combining this sample with 10 previously known events, we find a likely continuum of spectroscopic properties ranging from events with SN Ia-like features (Ca-Ia objects) to those with SN Ib/c-like features (Ca-Ib/c objects) at peak light. Within the Ca-Ib/c events, we find two populations distinguished by their red (g - r approximate to 1.5 mag) or green (g - r approximate to 0.5 mag) colors at the r-band peak, wherein redder events show strong line blanketing features and slower light curves (similar to Ca-Ia objects), weaker He lines, and lower [Ca II]/[O I] in the nebular phase. We find that all together the spectroscopic continuum, volumetric rates, and striking old environments are consistent with the explosive burning of He shells on low-mass white dwarfs. We suggest that Ca-Ia and red Ca-Ib/c objects arise from the double detonation of He shells, while green Ca-Ib/c objects are consistent with low-efficiency burning scenarios like detonations in low-density shells or deflagrations.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Kasliwal, Mansi M.
(author)
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Tzanidakis, Anastasios
(author)
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Fremling, U. Christoffer
(author)
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Adams, Scott
(author)
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Aloisi, Robert
(author)
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Andreoni, Igor
(author)
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Bagdasaryan, Ashot
(author)
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Bellm, Eric C.
(author)
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Bildsten, Lars
(author)
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Cannella, Christopher
(author)
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Cook, David O.
(author)
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Delacroix, Alexandre
(author)
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Drake, Andrew
(author)
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Duev, Dmitry
(author)
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Dugas, Alison
(author)
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Frederick, Sara
(author)
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Gal-Yam, Avishay
(author)
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Goldstein, Daniel
(author)
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Golkhou, V. Zach
(author)
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Graham, Matthew J.
(author)
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Hale, David
(author)
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Hankins, Matthew
(author)
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Helou, George
(author)
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Ho, Anna Y. Q.
(author)
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Irani, Ido
(author)
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Jencson, Jacob E.
(author)
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Kaplan, David L.
(author)
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Kaye, Stephen
(author)
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Kulkarni, S. R.
(author)
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Kupfer, Thomas
(author)
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Laher, Russ R.
(author)
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Leadbeater, Robin
(author)
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Lunnan, RagnhildStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)rlunn
(author)
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Masci, Frank J.
(author)
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Miller, Adam A.
(author)
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Neill, James D.
(author)
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Ofek, Eran O.
(author)
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Perley, Daniel A.
(author)
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Polin, Abigail
(author)
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Prince, Thomas A.
(author)
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Quataert, Eliot
(author)
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Reiley, Dan
(author)
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Riddle, Reed L.
(author)
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Rusholme, Ben
(author)
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Sharma, Yashvi
(author)
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Shupe, David L.
(author)
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Sollerman, JesperStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)solle
(author)
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Tartaglia, LeonardoStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)leta1160
(author)
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Walters, Richard
(author)
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Yan, Lin
(author)
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Yao, Yuhan
(author)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
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In:Astrophysical Journal: American Astronomical Society905:10004-637X1538-4357
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De, Kishalay
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Kasliwal, Mansi ...
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Tzanidakis, Anas ...
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Fremling, U. Chr ...
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Adams, Scott
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Aloisi, Robert
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Andreoni, Igor
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Bagdasaryan, Ash ...
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Bellm, Eric C.
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Bildsten, Lars
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Cannella, Christ ...
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Cook, David O.
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Delacroix, Alexa ...
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Drake, Andrew
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Duev, Dmitry
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Dugas, Alison
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Frederick, Sara
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Gal-Yam, Avishay
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Goldstein, Danie ...
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Golkhou, V. Zach
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Graham, Matthew ...
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Hale, David
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Hankins, Matthew
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Helou, George
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Ho, Anna Y. Q.
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Irani, Ido
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Jencson, Jacob E ...
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Kaplan, David L.
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Kaye, Stephen
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Kulkarni, S. R.
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Kupfer, Thomas
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Laher, Russ R.
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Leadbeater, Robi ...
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Lunnan, Ragnhild
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Masci, Frank J.
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Miller, Adam A.
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Neill, James D.
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Ofek, Eran O.
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Perley, Daniel A ...
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Polin, Abigail
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Prince, Thomas A ...
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Quataert, Eliot
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Reiley, Dan
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Riddle, Reed L.
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Rusholme, Ben
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Sharma, Yashvi
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Shupe, David L.
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Sollerman, Jespe ...
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Tartaglia, Leona ...
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Walters, Richard
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Yan, Lin
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Yao, Yuhan
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Stockholm University