J/other/Nat/601.201 Photometry of SN 2019hgp (Gal-Yam+, 2022)
A WC/WO star exploding within an expanding carbon-oxygen-neon nebula.
Gal-Yam A., Bruch R., Schulze S., Yang Y., Perley D.A., Irani I.,
Sollerman J., Kool E.C., Soumagnac M.T., Yaron O., Strotjohann N.L.,
Zimmerman E., Barbarino C., Kulkarni S.R., Kasliwal M.M., De K., Yao Y.,
Fremling C., Yan L., Ofek E.O., Fransson C., Filippenko A.V., Zheng W.,
Brink T.G., Copperwheat C.M., Foley R.J., Brown J., Siebert M., Leloudas G.,
Cabrera-Lavers A.L., Garcia-Alvarez D., Marante-Barreto A., Frederick S.,
Hung T., Wheeler J.C., Vinko J., Thomas B.P., Graham M.J., Duev D.A.,
Drake A.J., Dekany R., Bellm E.C., Rusholme B., Shupe D.L., Andreoni I.,
Sharma Y., Riddle R., van Roestel J., Knezevic N.
<Nature, 601, 201-204 (2022)>
=2022Natur.601..201G 2022Natur.601..201G (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, SDSS ; Ultraviolet
Abstract:
The final fate of massive stars, and the nature of the compact
remnants they leave behind (black holes and neutron stars), are open
questions in astrophysics. Many massive stars are stripped of their
outer hydrogen envelopes as they evolve. Such Wolf-Rayet stars emit
strong and rapidly expanding winds with speeds greater than 1000
kilometres per second. A fraction of this population is also
helium-depleted, with spectra dominated by highly ionized emission
lines of carbon and oxygen (types WC/WO). Evidence indicates that the
most commonly observed supernova explosions that lack hydrogen and
helium (types Ib/Ic) cannot result from massive WC/WO stars, leading
some to suggest that most such stars collapse directly into black
holes without a visible supernova explosion. Here we report
observations of SN 2019hgp, beginning about a day after the
explosion. Its short rise time and rapid decline place it among an
emerging population of rapidly evolving transients. Spectroscopy
reveals a rich set of emission lines indicating that the explosion
occurred within a nebula composed of carbon, oxygen and neon. Narrow
absorption features show that this material is expanding at high
velocities (greater than 1500 kilometres per second), requiring a
compact progenitor. Our observations are consistent with an explosion
of a massive WC/WO star, and suggest that massive Wolf-Rayet stars may
be the progenitors of some rapidly evolving transients.
Description:
Photometry of SN 2019hgp.
Objects:
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RA (2000) DE Designation(s)
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15 36 12.89 +39 44 00.5 SN 2019hgp = ZTF19aayejww
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 360 Full photometry of SN 2019hgp
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 d MJD Modified Julian date
10- 15 F6.2 d Phase Rest-frame Phase (days from explosions)
17- 21 F5.2 mag mag Magnitude in Filter (AB)
23- 28 F6.2 mag e_mag ?=-99 Magnitude in Filter (AB) error
30- 34 A5 --- Inst Instrument (1)
36- 39 A4 --- Filt Filter (1)
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Note (1): Instruments and filters are:
GTC, gri; LT, ugriz; P48, gri; P60, gri; SWIFT, UVW1 UVW2 UVM2 UBV.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 19-Jun-2023