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J/ApJ/787/29  UVOT photometry of Super-Chandrasekhar mass SNe Ia  (Brown+, 2014)

Ultraviolet observations of Super-Chandrasekhar mass Type Ia supernova candidates with Swift UVOT. Brown P.J., Kuin P., Scalzo R., Smitka M.T., De Pasquale M., Holland S., Krisciunas K., Milne P., Wang L. <Astrophys. J., 787, 29 (2014)> =2014ApJ...787...29B (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, ultraviolet Keywords: supernovae: general - supernovae: individual: SN 2009dc, SN 2011aa, SN 2012dn - ultraviolet: general Abstract: Among Type Ia supernovae (SNe Ia), a class of overluminous objects exist whose ejecta mass is inferred to be larger than the canonical Chandrasekhar mass. We present and discuss the UV/optical photometric light curves, colors, absolute magnitudes, and spectra of three candidate Super-Chandrasekhar mass SNe - 2009dc, 2011aa, and 2012dn - observed with the Swift Ultraviolet/Optical Telescope. The light curves are at the broad end for SNe Ia, with the light curves of SN 2011aa being among the broadest ever observed. We find all three to have very blue colors which may provide a means of excluding these overluminous SNe from cosmological analysis, though there is some overlap with the bluest of "normal" SNe Ia. All three are overluminous in their UV absolute magnitudes compared to normal and broad SNe Ia, but SNe 2011aa and 2012dn are not optically overluminous compared to normal SNe Ia. The integrated luminosity curves of SNe 2011aa and 2012dn in the UVOT range (1600-6000 Å) are only half as bright as SN 2009dc, implying a smaller 56Ni yield. While it is not enough to strongly affect the bolometric flux, the early time mid-UV flux makes a significant contribution at early times. The strong spectral features in the mid-UV spectra of SNe 2009dc and 2012dn suggest a higher temperature and lower opacity to be the cause of the UV excess rather than a hot, smooth blackbody from shock interaction. Further work is needed to determine the ejecta and 56Ni masses of SNe 2011aa and 2012dn and to fully explain their high UV luminosities. Description: SC SNe are hot, high-energy explosions, so ultraviolet (UV) coverage is important to better measure the total luminosity and determine its origin, in particular whether it originates from shocks or simply a hot photosphere. The Ultraviolet/Optical Telescope (UVOT; Roming et al. 2005SSRv..120...95R) on the Swift satellite (Gehrels et al. 2004ApJ...611.1005G) presents an excellent opportunity to obtain unique, early-time UV data. This paper will focus on three objects: SN 2009dc - a well-studied member of the Super-Chandrasekhar mass SN class - and SNe 2011aa and 2012dn, which share some characteristics. Objects: --------------------------------------------------------------- RA (ICRS) DE Designation(s) --------------------------------------------------------------- 15 51 12.12 +25 42 28.0 SN 2009dc = SN 2009dc 07 36 42.63 +74 26 34.8 SN 2011aa = PSN J07364263+7426348 20 23 36.26 -28 16 43.4 SN 2012dn = PSN J20233626-2816434 --------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 34 3 List of studied supernovae table1.dat 48 271 UVOT photometry
See also: II/339 : Swift/UVOT Serendipitous Source Catalog (Yershov, 2015) J/AJ/137/4517 : UVOT light curves of supernovae (Brown+, 2009) J/ApJ/721/1608 : Absolute UV magnitudes of type Ia SNe (Brown+, 2010) J/MNRAS/410/585 : SN 2009dc BVRI light curves (Silverman+, 2011) J/ApJ/749/18 : Swift/UVOT observations of 12 nearby SN-Ia (Brown+, 2012) Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 8 A8 --- SN Supernova identifier 12- 13 I2 h RAh Simbad Right ascension (J2000) 15- 16 I2 min RAm Simbad Right ascension (J2000) 18- 22 F5.2 s RAs Simbad Right ascension (J2000) 24 A1 --- DE- Simbad Declination sign (J2000) 25- 26 I2 deg DEd Simbad Declination (J2000) 28- 29 I2 arcmin DEm Simbad Declination (J2000) 31- 34 F4.1 arcsec DEs Simbad Declination (J2000)
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- SN Supernova identifier (SN YYYYaa in Simbad) 10- 11 A2 --- Filter Swift/UVOT filter used in the observation 13- 22 F10.4 d MJD Modified Julian Date of observation 24- 29 F6.3 mag mag ? Observed magnitude in Filter 31- 35 F5.3 mag e_mag ? Error in mag 37- 42 F6.3 ct/s CR ? Count rate 44- 48 F5.3 ct/s e_CR ? Error in CR
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 23-Jun-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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