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dc.creatorMarion, G. H.en_US
dc.creatorVinko, Jozsefen_US
dc.creatorWheeler, J. Craigen_US
dc.creatorFoley, Ryan J.en_US
dc.creatorHsiao, Eric Y.en_US
dc.creatorBrown, Peter J.en_US
dc.creatorChallis, Peteren_US
dc.creatorFilippenko, Alexei V.en_US
dc.creatorGarnavich, Peteren_US
dc.creatorKirshner, Robert P.en_US
dc.creatorLandsman, Wayne B.en_US
dc.creatorParrent, Jerod T.en_US
dc.creatorPritchard, Tyler A.en_US
dc.creatorRoming, Peter W. A.en_US
dc.creatorSilverman, Jeffrey M.en_US
dc.creatorWang, Xiaofengen_US
dc.date.accessioned2016-04-28T19:37:31Z
dc.date.available2016-04-28T19:37:31Z
dc.date.issued2013-11en
dc.identifierdoi:10.15781/T2TC09
dc.identifier.citationMarion, G. Howie, Jozsef Vinko, J. Craig Wheeler, Ryan J. Foley, Eric Y. Hsiao, Peter J. Brown, Peter Challis et al. "High-Velocity Line Forming Regions in the Type Ia Supernova 2009ig." The Astrophysical Journal, Vol. 777, No. 1 (Nov., 2013): 40.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34944
dc.description.abstractWe report measurements and analysis of high-velocity (HVF) (>20,000 km s(-1)) and photospheric absorption features in a series of spectra of the Type Ia supernova (SN) 2009ig obtained between -14 days and +13 days with respect to the time of maximum B-band luminosity (B-max). We identify lines of Si II, Si III, S II, Ca II, and Fe II that produce both HVF and photospheric-velocity (PVF) absorption features. SN 2009ig is unusual for the large number of lines with detectable HVF in the spectra, but the light-curve parameters correspond to a slightly overluminous but unexceptional SN Ia (M-B = -19.46 mag and Delta m(15)(B) = 0.90 mag). Similarly, the Si II lambda 6355 velocity at the time of B-max is greater than "normal" for an SN Ia, but it is not extreme (upsilon(Si) = 13,400 km s(-1)). The -14 days and -13 days spectra clearly resolve HVF from Si II lambda 6355 as separate absorptions from a detached line forming region. At these very early phases, detached HVF are prevalent in all lines. From -12 days to -6 days, HVF and PVF are detected simultaneously, and the two line forming regions maintain a constant separation of about 8000 km s(-1). After -6 days all absorption features are PVF. The observations of SN 2009ig provide a complete picture of the transition from HVF to PVF. Most SNe Ia show evidence for HVF from multiple lines in spectra obtained before -10 days, and we compare the spectra of SN 2009ig to observations of other SNe. We show that each of the unusual line profiles for Si II lambda 6355 found in early-time spectra of SNe Ia correlate to a specific phase in a common development sequence from HVF to PVF.en_US
dc.description.sponsorshipHungarian OTKA Grants K-76816, NN-107637en_US
dc.description.sponsorshipNSF AST-0707769, AST-1211196, AST-1008343, AST-1211916en_US
dc.description.sponsorshipTexas Advanced Research Project ARP-009en_US
dc.description.sponsorshipNatural Science Foundation of China NSFC 11178003, 11073013en_US
dc.description.sponsorshipChina-973 Program 2009CB824800en_US
dc.description.sponsorshipTABASGO Foundationen_US
dc.description.sponsorshipChristopher R. Redlich Funden_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectline: formationen_US
dc.subjectline: identificationen_US
dc.subjectsupernovae: generalen_US
dc.subjectsupernovae:en_US
dc.subjectindividual (sn 2009ig)en_US
dc.subjecthobby-eberly telescopeen_US
dc.subjectimproved distancesen_US
dc.subjectsn 2001elen_US
dc.subjectspectraen_US
dc.subjectfeaturesen_US
dc.subjectspectroscopyen_US
dc.subjectejectaen_US
dc.subjectresolutionen_US
dc.subjectspectropolarimetryen_US
dc.subjectspectrographen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleHigh-Velocity Line Forming Regions In The Type Ia Supernova 2009igen_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.identifier.Filename2013_11_supernova2009ig.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/0004-637x/777/1/40en_US
dc.contributor.utaustinauthorMarion, G. H.en_US
dc.contributor.utaustinauthorVinko, Jozsefen_US
dc.contributor.utaustinauthorWheeler, J. Craigen_US
dc.contributor.utaustinauthorSilverman, Jeffrey M.en_US
dc.relation.ispartofserialAstrophysical Journalen_US


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