J/ApJ/854/L14 Photometry and spectra of SN 2017dio (Kuncarayakti+, 2018)
SN 2017dio: a type-Ic supernova exploding in a hydrogen-rich circumstellar
medium.
Kuncarayakti H., Maeda K., Ashall C.J., Prentice S.J., Mattila S.,
Kankare E., Fransson C., Lundqvist P., Pastorello A., Leloudas G.,
Anderson J.P., Benetti S., Bersten M.C., Cappellaro E., Cartier R.,
Denneau L., Della Valle M., Elias-Rosa N., Folatelli G., Fraser M.,
Galbany L., Gall C., Gal-Yam A., Gutierrez C.P., Hamanowicz A., Heinze A.,
Inserra C., Kangas T., Mazzali P., Melandri A., Pignata G., Rest A.,
Reynolds T., Roy R., Smartt S.J., Smith K.W., Sollerman J., Somero A.,
Stalder B., Stritzinger M., Taddia F., Tomasella L., Tonry J., Weiland H.,
Young D.R.
<Astrophys. J. 854, L14 (2018)>
=2018ApJ...854L..14K 2018ApJ...854L..14K (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, SDSS ; Spectra, optical
Keywords: supernovae: general - supernovae: individual (SN 2017dio)
Abstract:
SN 2017dio shows both spectral characteristics of a type-Ic supernova
(SN) and signs of a hydrogen-rich circumstellar medium (CSM).
Prominent, narrow emission lines of H and He are superposed on the
continuum. Subsequent evolution revealed that the SN ejecta are
interacting with the CSM. The initial SN Ic identification was
confirmed by removing the CSM interaction component from the spectrum
and comparing with known SNe Ic, and reversely, adding a CSM
interaction component to the spectra of known SNe Ic and comparing
them to SN 2017dio. Excellent agreement was obtained with both
procedures, reinforcing the SN Ic classification. The light curve
constrains the pre-interaction SN Ic peak absolute magnitude to be
around Mg=-17.6mag. No evidence of significant extinction is
found, ruling out a brighter luminosity required by a SN Ia
classification. These pieces of evidence support the view that SN
2017dio is a SN Ic, and therefore the first firm case of a SN Ic with
signatures of hydrogen-rich CSM in the early spectrum. The CSM is
unlikely to have been shaped by steady-state stellar winds. The mass
loss of the progenitor star must have been intense,
dM/dt∼0.02(εHa/0.01)-1*(vwind/500km/s)*
(vshock/10000km/s)-3M☉/yr, peaking at a few decades before
the SN. Such a high mass loss rate might have been experienced by the
progenitor through eruptions or binary stripping.
Description:
ugriz + JHK photometry and optical spectra of SN 2017dio.
Optical photometry was obtained in ugriz filters using ALFOSC at the
Nordic Optical Telescope (NOT), IO:O at the Liverpool Telescope (LT),
and Spectral at the 2 m telescopes of Las Cumbres Observatory. JHK
photometry was obtained using NOT/NOTCam at one epoch, 2017 July 27.
Optical slit-spectroscopy was obtained using ALFOSC at the NOT, EFOSC2
at the ESO New Technology Telescope (NTT, through the ePESSTO
program), and SPRAT 45 at the LT. ALFOSC spectra cover 3300-9500Å,
with a resolution of 16Å. With EFOSC2, grism #13, the coverage was
3500-9300Å, at a 21Å resolution. Additionally, in two epochs
the EFOSC2 spectra were taken using grism #11 (16Å resolution).
SPRAT covers 4000-8000Å, with a 18Å resolution.
Objects:
-----------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------
11 36 27.76 +18 17 46.92 SN 2017dio
-----------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ph17dio.dat 129 24 Photometry in ugriz + JHKs
s170430.dat 27 1015 Spectrum on 2017-04-30
s170501.dat 28 1629 Spectrum on 2017-05-01
s170502.dat 27 1875 Spectrum on 2017-05-02
s170513.dat 27 433 Spectrum on 2017-05-13
s170514.dat 27 1875 Spectrum on 2017-05-14
s170523.dat 27 1875 Spectrum on 2017-05-23
s170601.dat 27 1629 Spectrum on 2017-06-01
s170619.dat 27 1875 Spectrum on 2017-06-19
s170718.dat 27 1875 Spectrum on 2017-07-18
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Byte-by-byte Description of file: ph17dio.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Date of observation
12- 25 F14.8 d MJD MJD of observation
27- 32 F6.3 mag umag ?=- SDSS u-band magnitude
34- 38 F5.3 mag e_umag ?=- Error in SDSS u-band magnitude
40- 45 F6.3 mag gmag ?=- SDSS g-band magnitude
47- 51 F5.3 mag e_gmag ?=- Error in SDSS g-band magnitude
53- 58 F6.3 mag rmag ?=- SDSS r-band magnitude
60- 64 F5.3 mag e_rmag ?=- Error in SDSS r-band magnitude
66- 71 F6.3 mag imag ?=- SDSS i-band magnitude
73- 77 F5.3 mag e_imag ?=- Error in SDSS i-band magnitude
79- 84 F6.3 mag zmag ?=- SDSS z-band magnitude
86- 90 F5.3 mag e_zmag ?=- Error in SDSS z-band magnitude
92- 96 A5 --- Tel Telescope used for observation
98-102 F5.2 mag Jmag ?=- J-band magnitude
104-107 F4.2 mag e_Jmag ?=- Error in J-band magnitude
109-113 F5.2 mag Hmag ?=- H-band magnitude
115-118 F4.2 mag e_Hmag ?=- Error in H-band magnitude
120-124 F5.2 mag Kmag ?=- Ks-band magnitude
126-129 F4.2 mag e_Kmag ?=- Error in Ks-band magnitude
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Byte-by-byte Description of file: s*.dat
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Bytes Format Units Label Explanations
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1- 16 F16.11 0.1nm lambda Spectrum wavelength
18- 28 F11.8 10-2W/m2/nm Flux Spectrum flux (in erg/cm2/s/Å)
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Acknowledgements:
Hanindyo Kuncarayakti, kuncarayakti(at)gmail.com
(End) Patricia Vannier [CDS] 16-Feb-2018