Search: onr:"swepub:oai:DiVA.org:su-159008" >
ASASSN-15nx :
ASASSN-15nx : A Luminous Type II Supernova with a Perfect Linear Decline
- Article/chapterEnglish2018
Publisher, publication year, extent ...
-
2018-07-27
-
American Astronomical Society,2018
-
printrdacarrier
Numbers
-
LIBRIS-ID:oai:DiVA.org:su-159008
-
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-159008URI
-
https://doi.org/10.3847/1538-4357/aacb35DOI
Supplementary language notes
-
Language:English
-
Summary in:English
Part of subdatabase
Classification
-
Subject category:ref swepub-contenttype
-
Subject category:art swepub-publicationtype
Notes
-
We report a luminous Type II supernova, ASASSN-15nx, with a peak luminosity of M-v = -20 mag that is between those of typical core-collapse supernovae and super-luminous supernovae. The post-peak optical light curves show a long, linear decline with a steep slope of 2.5 mag (100 day)(-1) (i.e., an exponential decline in flux) through the end of observations at phase approximate to 260 day. In contrast, the light curves of hydrogen-rich supernovae (SNe II-P/L) always show breaks in their light curves at phase similar to 100 day, before settling onto Co-56 radioactive decay tails with a decline rate of about 1 mag (100 day)(-1). The spectra of ASASSN-15nx do not exhibit the narrow emission-line features characteristic of Type IIn SNe, which can have a wide variety of light-curve shapes usually attributed to strong interactions with a dense circumstellar medium (CSM). ASASSN-15nx has a number of spectroscopic peculiarities, including a relatively weak and triangular-shaped H alpha emission profile with no absorption component. The physical origin of these peculiarities is unclear, but the long and linear post-peak light curve without a break suggests a single dominant powering mechanism. Decay of a large amount of Ni-56 (M-Ni = 1.6 +/- 0.2 M-circle dot) can power the light curve of ASASSN-15nx, and the steep light-curve slope requires substantial gamma-ray escape from the ejecta, which is possible given a low-mass hydrogen envelope for the progenitor. Another possibility is strong CSM interactions powering the light curve, but the CSM needs to be sculpted to produce the unique light-curve shape and avoid producing SN IIn-like narrow emission lines.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
-
Dong, Subo
(author)
-
Kochanek, C. S.
(author)
-
Pastorello, Andrea
(author)
-
Katz, Boaz
(author)
-
Bersier, David
(author)
-
Andrews, Jennifer E.
(author)
-
Prieto, J. L.
(author)
-
Stanek, K. Z.
(author)
-
Shappee, B. J.
(author)
-
Smith, Nathan
(author)
-
Kollmeier, Juna
(author)
-
Benetti, Stefano
(author)
-
Cappellaro, E.
(author)
-
Chen, Ping
(author)
-
Elias-Rosa, N.
(author)
-
Milne, Peter
(author)
-
Morales-Garoffolo, Antonia
(author)
-
Tartaglia, LeonardoStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)leta1160
(author)
-
Tomasella, L.
(author)
-
Bilinski, Christopher
(author)
-
Brimacombe, Joseph
(author)
-
Frank, Stephan
(author)
-
Holoien, T. W. -S.
(author)
-
Kilpatrick, Charles D.
(author)
-
Kiyota, Seiichiro
(author)
-
Madore, Barry F.
(author)
-
Rich, Jeffrey A.
(author)
-
Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
Related titles
-
In:Astrophysical Journal: American Astronomical Society862:20004-637X1538-4357
Internet link
Find in a library
To the university's database
- By the author/editor
-
Bose, Subhash
-
Dong, Subo
-
Kochanek, C. S.
-
Pastorello, Andr ...
-
Katz, Boaz
-
Bersier, David
-
show more...
-
Andrews, Jennife ...
-
Prieto, J. L.
-
Stanek, K. Z.
-
Shappee, B. J.
-
Smith, Nathan
-
Kollmeier, Juna
-
Benetti, Stefano
-
Cappellaro, E.
-
Chen, Ping
-
Elias-Rosa, N.
-
Milne, Peter
-
Morales-Garoffol ...
-
Tartaglia, Leona ...
-
Tomasella, L.
-
Bilinski, Christ ...
-
Brimacombe, Jose ...
-
Frank, Stephan
-
Holoien, T. W. - ...
-
Kilpatrick, Char ...
-
Kiyota, Seiichir ...
-
Madore, Barry F.
-
Rich, Jeffrey A.
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Astronomy Astrop ...
- Articles in the publication
-
Astrophysical Jo ...
- By the university
-
Stockholm University