EVIDENCE FOR TYPE Ia SUPERNOVA DIVERSITY FROM ULTRAVIOLET OBSERVATIONS WITH THE HUBBLE SPACE TELESCOPE

	EVIDENCE FOR TYPE Ia SUPERNOVA DIVERSITY FROM ULTRAVIOLET OBSERVATIONS WITH THE HUBBLE SPACE TELESCOPE
	Wang, Xiaofeng 1,2,3,4; Wang, Lifan 3; Filippenko, Alexei V.4; Baron, Eddie 5; Kromer, Markus 6; Jack, Dennis 7; Zhang, Tianmeng8 ; Aldering, Greg 9; Antilogus, Pierre 10; Arnett, W. David 11
刊名	ASTROPHYSICAL JOURNAL
	2012-04-01
卷号	749 期号:2
关键词	cosmology: observations distance scale dust, extinction supernovae: general ultraviolet: general
英文摘要	We present ultraviolet (UV) spectroscopy and photometry of four Type Ia supernovae (SNe 2004dt, 2004ef, 2005M, and 2005cf) obtained with the UV prism of the Advanced Camera for Surveys on the Hubble Space Telescope. This data set provides unique spectral time series down to 2000 angstrom. Significant diversity is seen in the near-maximum-light spectra (similar to 2000-3500 angstrom) for this small sample. The corresponding photometric data, together with archival data from Swift Ultraviolet/Optical Telescope observations, provide further evidence of increased dispersion in the UV emission with respect to the optical. The peak luminositiesmeasured in the uvw1/F250W filter are found to correlate with the B-band light-curve shape parameter Delta m(15)(B), but with much larger scatter relative to the correlation in the broadband B band (e.g., similar to 0.4 mag versus similar to 0.2 mag for those with 0.8 mag < Delta m(15)(B) < 1.7 mag). SN 2004dt is found as an outlier of this correlation (at > 3 sigma), being brighter than normal SNe Ia such as SN 2005cf by similar to 0.9 mag and similar to 2.0 mag in the uvw1/F250W and uvm2/F220W filters, respectively. We show that different progenitor metallicity or line-expansion velocities alone cannot explain such a large discrepancy. Viewing-angle effects, such as due to an asymmetric explosion, may have a significant influence on the flux emitted in the UV region. Detailed modeling is needed to disentangle and quantify the above effects.
收录类别	SCI
语种	英语
WOS记录号	WOS:000302785700030
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6059]
专题	国家天文台_光学天文研究部
作者单位	1.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China 2.Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China 3.Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA 4.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA 5.Univ Oklahoma, Dept Phys, Norman, OK 73019 USA 6.Max Planck Inst Astrophys, D-85748 Garching, Germany 7.Hamburger Sternwarte, D-21029 Hamburg, Germany 8.Chinese Acad Sci, Natl Astron Observ China, Beijing 100012, Peoples R China 9.Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA 10.Lab Phys Nucl Hautes Energies, Paris, France
推荐引用方式 GB/T 7714	Wang, Xiaofeng,Wang, Lifan,Filippenko, Alexei V.,et al. EVIDENCE FOR TYPE Ia SUPERNOVA DIVERSITY FROM ULTRAVIOLET OBSERVATIONS WITH THE HUBBLE SPACE TELESCOPE[J]. ASTROPHYSICAL JOURNAL,2012,749(2).
APA	Wang, Xiaofeng.,Wang, Lifan.,Filippenko, Alexei V..,Baron, Eddie.,Kromer, Markus.,...&Yamaoka, Hitoshi.(2012).EVIDENCE FOR TYPE Ia SUPERNOVA DIVERSITY FROM ULTRAVIOLET OBSERVATIONS WITH THE HUBBLE SPACE TELESCOPE.ASTROPHYSICAL JOURNAL,749(2).
MLA	Wang, Xiaofeng,et al."EVIDENCE FOR TYPE Ia SUPERNOVA DIVERSITY FROM ULTRAVIOLET OBSERVATIONS WITH THE HUBBLE SPACE TELESCOPE".ASTROPHYSICAL JOURNAL 749.2(2012).