J/A+A/618/A37 Spectral log of (i)PTF stripped-envelope SN (Fremling+, 2018)
Oxygen and helium in stripped-envelope supernovae.
Fremling C., Sollerman J., Kasliwal M.M., Kulkarni S.R., Barbarino C.,
Ergon M., Karamehmetoglu E., Taddia F., Arcavi I., Cenko S.B., Clubb K.,
De Cia A., Duggan G., Filippenko A.V., Gal-Yam A., Graham M.L., Horesh A.,
Hosseinzadeh G., Howell D.A., Kuesters D., Lunnan R., Matheson T.,
Nugent P.E., Perley D.A., Quimby R.M., Saunders C.
<Astron. Astrophys., 618, A37 (2018)>
=2018A&A...618A..37F 2018A&A...618A..37F (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae
Keywords: supernovae: general - stars: abundances - stars: mass-loss -
techniques: spectroscopic
Abstract:
We present an analysis of 507 spectra of 173 stripped-envelope (SE)
supernovae (SNe) discovered by the untargeted Palomar Transient
Factory (PTF) and intermediate PTF (iPTF) surveys. Our sample contains
55 TypeIIb SNe (SNeIIb), 45 TypeIb SNe (SNeIb), 56 TypeIc SNe (SNeIc),
and 17 TypeIb/c SNe (SNeIb/c). We have compared the SE SN subtypes via
measurements of the pseudo-equivalent widths (pEWs) and velocities of
the HeIλλ5876, 7065 and OIλ7774 absorption lines.
Consistent with previous work, we find that SNeIc show higher pEWs and
velocities in OIλ7774 compared to SNeIIb andIb. The pEWs of the
HeIλλ5876, 7065 lines are similar in SNeIb andIIb after
maximum light. The HeIλλ5876, 7065 velocities at maximum
light are higher in SNeIb compared to SNeIIb. We identify an
anticorrelation between the HeIλ7065 pEW and OIλ7774
velocity among SNeIIb andIb. This can be interpreted as a continuum in
the amount of He present at the time of explosion.It has been
suggested that SNeIb andIc have similar amounts of He, and that lower
mixing could be responsible for hiding He in SNeIc. However, our data
contradict this mixing hypothesis. The observed difference in the
expansion rate of the ejecta around maximum light of SNeIc
(Vm=sqrt(2)Ek/Mej~=15000km/s) and SNeIb (Vm~=9000km/s) would
imply an average He mass difference of ∼1.4M☉, if the other
explosion parameters are assumed to be unchanged between the SE SN
subtypes. We conclude that SNeIc do not hide He but lose He due to
envelope stripping.
Description:
To estimate the epoch of maximum light for each SN, we used r- or
g-band photometry from the Palomar 48 inch (P48) and 60 inch (P60)
telescopes, depending on availability for each SN.
During the lifetimes of PTF and iPTF we obtained 507 spectra at unique
epochs of SE SNe.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 103 166 Spectral log for the (i)PTF stripped-envelope
SN sample
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- SN SN name NNaaaa
9- 13 A5 --- Type SN type
16 A1 --- Note [*] Note (1)
17- 89 A73 --- Phase Phase (rest-frame days from peak) (2)
92- 96 F5.3 --- z Redshift
100-103 F4.2 mag E(B-V) Milky Way E(B-V) colour excess
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Note (1): * when it was impossible to determine the time of maximum light from
their LCs. We have classified these objects based on spectra obtained by the
(i)PTF, but they are not included in any further analysis.
Note (2): Spectra were obtained using the following telescopes and instruments:
Keck I/LRIS (Oke et al. 1995PASP..107..375O 1995PASP..107..375O),
Keck II/DEIMOS (Faber et al. 2003, Proc. SPIE, 4841, 1657),
P200/DBSP (Oke & Gunn 1982PASP...94.586O),
P60/SEDM, Gemini N/GMOS (Hook et al. 2004PASP..116..425H 2004PASP..116..425H),
Gemini S/GMOS-S, WHT/ACAM (Benn et al. 2008, Proc. SPIE, 7014, 70146X),
WHT/ISIS, NOT/ALFOSC, ARC 3.5m/DIS, Lick 3m/KAST, FTN/FLOYDS, FTS/FLOYDS,
DCT/DeVeny/LMI, GTC/OSIRIS, HET/LRS (Hill et al. 1998, Proc. SPIE, 3355, 375),
KPNO 4m/RCSpec, Magellan I/IMACS (Dressler et al. 2011PASP..123..288D 2011PASP..123..288D),
Magellan II/LDSS3 (Osip et al. 2008, Proc. SPIE, 7014, 70140A),
SALT/RSS, TNG/DOLORES, UH88/SNIFS (Lantz et al. 2004, Proc. SPIE, 5249, 146),
VLT/FORS2 (Appenzeller et al. 1998Msngr..94....1A 1998Msngr..94....1A), Wise 1m/FOSC.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Dec-2018