Change search
ReferencesLink to record
Permanent link

Direct link
Multi epoch high resolution spectroscopy of sn 2011fe linking the progenitor to its environment
Show others and affiliations
2013 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 549, A62- p.Article in journal (Refereed) Published
Abstract [en]

Aims. The nearby Type Ia supernova (SN) 2011fe has provided an unprecedented opportunity for deriving some of the properties of its progenitor. This work provides additional and independent information on the circumstellar environment in which the explosion took place. Methods. We obtained high-resolution spectroscopy of SN 2011fe for 12 epochs, from 8 to 86 days after the estimated date of explosion, testing in particular the time evolution of Ca II and Na I. Results. Three main absorption systems are identified from Ca II and Na I, one associated to the Milky Way, one probably arising within a high-velocity cloud, and one most likely associated to the halo of M101. The total (Galactic and host galaxy) reddening, deduced from the integrated equivalent widths (EW) of the Na I lines, is EB-V less than or similar to 0.05 mag. The host galaxy absorption is dominated by a component detected at the same velocity measured from the 21-cm H 1 line at the projected SN position (similar to 180 km s(-1)). During the similar to 3 months covered by our observations its EW peak-to-peak variation is 15.6 +/- 6.5 m angstrom. This small and marginally significant change is shown to be compatible with the geometric effects produced by the rapid SN photosphere expansion coupled to the patchy fractal structure of the interstellar medium (ISM). The observed behavior is fully consistent with ISM properties similar to those derived for our own Galaxy, with evidences for structures on scales less than or similar to 100 AU. Conclusions. SN 2011fe appears to be surrounded by a clean environment. The lack of blueshifted, time-variable absorption features is fully consistent with the progenitor being a binary system with a main-sequence, or even another degenerate star.

Place, publisher, year, edition, pages
2013. Vol. 549, A62- p.
Keyword [en]
supernovae: general, supernovae: individual: SN2011fe, ISM: general, dust, extinction, ISM: clouds
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-88318DOI: 10.1051/0004-6361/201118556ISI: 000313745000062OAI: diva2:611845


Available from: 2013-03-19 Created: 2013-03-12 Last updated: 2013-03-19Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Goobar, ArielSollerman, Jesper
By organisation
Department of PhysicsDepartment of Astronomy
In the same journal
Astronomy and Astrophysics
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 15 hits
ReferencesLink to record
Permanent link

Direct link