MULTI-WAVELENGTH OBSERVATIONS OF SUPERNOVA 2011ei: TIME-DEPENDENT CLASSIFICATION OF TYPE IIb AND Ib SUPERNOVAE AND IMPLICATIONS FOR THEIR PROGENITORS

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MARC

Milisavljevic, Dan (author)

MULTI-WAVELENGTH OBSERVATIONS OF SUPERNOVA 2011ei : TIME-DEPENDENT CLASSIFICATION OF TYPE IIb AND Ib SUPERNOVAE AND IMPLICATIONS FOR THEIR PROGENITORS

Article/chapterEnglish2013

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2013
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LIBRIS-ID:oai:DiVA.org:su-89797
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-89797URI
https://doi.org/10.1088/0004-637X/767/1/71DOI

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Language:English
Summary in:English

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SwePubSwePub

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

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AuthorCount:42;
We present X-ray, UV/optical, and radio observations of the stripped-envelope, core-collapse supernova (SN) 2011ei, one of the least luminous SNe IIb or Ib observed to date. Our observations begin with a discovery within similar to 1 day of explosion and span several months afterward. Early optical spectra exhibit broad, Type II-like hydrogen Balmer profiles that subside rapidly and are replaced by Type Ib-like He-rich features on a timescale of one week. High-cadence monitoring of this transition suggests absorption attributable to a high-velocity (greater than or similar to 12,000 km s(-1)) H-rich shell, which is likely present in many Type Ib events. Radio observations imply a shock velocity of v approximate to 0.13 c and a progenitor star average mass-loss rate of (M) over dot approximate to 1.4 x 10(-5) M-circle dot yr(-1) (assuming wind velocity v(w) = 10(3) km s(-1)). This is consistent with independent constraints from deep X-ray observations with Swift-XRT and Chandra. Overall, the multi-wavelength properties of SN 2011ei are consistent with the explosion of a lower-mass (3-4 M-circle dot), compact (R-* less than or similar to 1 x 10(11) cm), He-core star. The star retained a thin hydrogen envelope at the time of explosion, and was embedded in an inhomogeneous circumstellar wind suggestive of modest episodic mass loss. We conclude that SN 2011ei's rapid spectral metamorphosis is indicative of time-dependent classifications that bias estimates of the relative explosion rates for Type IIb and Ib objects, and that important information about a progenitor star's evolutionary state and mass loss immediately prior to SN explosion can be inferred from timely multi-wavelength observations.

Subject headings and genre

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
supernovae: general
supernovae: individual (SN 2011ei)

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

Margutti, Raffaella (author)
Soderberg, Alicia M. (author)
Pignata, Giuliano (author)
Chomiuk, Laura (author)
Fesen, Robert A. (author)
Bufano, Filomena (author)
Sanders, Nathan E. (author)
Parrent, Jerod T. (author)
Parker, Stuart (author)
Mazzali, Paolo (author)
Pian, Elena (author)
Pickering, Timothy (author)
Buckley, David A. H. (author)
Crawford, Steven M. (author)
Gulbis, Amanda A. S. (author)
Hettlage, Christian (author)
Hooper, Eric (author)
Nordsieck, Kenneth H. (author)
O'Donoghue, Darragh (author)
Husser, Tim-Oliver (author)
Potter, Stephen (author)
Kniazev, Alexei (author)
Kotze, Paul (author)
Romero-Colmenero, Encarni (author)
Vaisanen, Petri (author)
Wolf, Marsha (author)
Bietenholz, Michael F. (author)
Bartel, Norbert (author)
Fransson, ClaesStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)frans (author)
Walker, Emma S. (author)
Brunthaler, Andreas (author)
Chakraborti, Sayan (author)
Levesque, Emily M. (author)
MacFadyen, Andrew (author)
Drescher, Colin (author)
Bock, Greg (author)
Marples, Peter (author)
Anderson, Joseph P. (author)
Benetti, Stefano (author)
Reichart, Daniel (author)
Ivarsen, Kevin (author)
Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

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In:Astrophysical Journal767:1, s. 71-0004-637X1538-4357

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By the author/editor: Milisavljevic, D ...; Margutti, Raffae ...; Soderberg, Alici ...; Pignata, Giulian ...; Chomiuk, Laura; Fesen, Robert A.; show more...; Bufano, Filomena; Sanders, Nathan ...; Parrent, Jerod T ...; Parker, Stuart; Mazzali, Paolo; Pian, Elena; Pickering, Timot ...; Buckley, David A ...; Crawford, Steven ...; Gulbis, Amanda A ...; Hettlage, Christ ...; Hooper, Eric; Nordsieck, Kenne ...; O'Donoghue, Darr ...; Husser, Tim-Oliv ...; Potter, Stephen; Kniazev, Alexei; Kotze, Paul; Romero-Colmenero ...; Vaisanen, Petri; Wolf, Marsha; Bietenholz, Mich ...; Bartel, Norbert; Fransson, Claes; Walker, Emma S.; Brunthaler, Andr ...; Chakraborti, Say ...; Levesque, Emily ...; MacFadyen, Andre ...; Drescher, Colin; Bock, Greg; Marples, Peter; Anderson, Joseph ...; Benetti, Stefano; Reichart, Daniel; Ivarsen, Kevin; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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By the university: Stockholm University

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