Abstract
ABSTRACTWe present Keck spectropolarimetry of the unusual Type Ia supernova (SN Ia) 2005hk several days before maximum light. An analysis of the high signal‐to‐noise ratio total‐flux spectrum shows the object’s extreme similarity to the peculiar SN 2002cx. SN 2005hk has an optical spectrum dominated by Fe iii lines and only weak lines of intermediate‐mass elements, unlike a normal SN Ia at this epoch. The photospheric velocity measured from the minima of strong absorption lines is very low for an SN Ia (∼6000 km s−1), solidifying the connection to SN 2002cx. The spectrum‐synthesis code SYNOW was used to identify the presence of iron‐peak elements, intermediate‐mass elements, and possibly unburned carbon at similar velocities in the outer ejecta of SN 2005hk. Many weak spectral features remain unidentified. The spectropolarimetry shows a low level of continuum polarization (∼0.4%) after correction for the interstellar component, and only a weak Fe iii line feature is detected. The level of continuum polarization is normal for an SN Ia, implying that the unusual features of SN 2005hk cannot be readily explained by large asymmetries.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Publications of the Astronomical Society of the Pacific
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
