The Exotic Type Ic Broad-lined Supernova SN 2018gep: Blurring the Line between Supernovae and Fast Optical Transients
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The Exotic Type Ic Broad-lined Supernova SN 2018gep : Blurring the Line between Supernovae and Fast Optical Transients. / Pritchard, T. A.; Bensch, Katarzyna; Modjaz, Maryam; Williamson, Marc; Thone, Christina C.; Vinko, J.; Bianco, Federica B.; Bostroem, K. Azalee; Burke, Jamison; Garcia-Benito, Ruben; Galbany, L.; Hiramatsu, Daichi; Howell, D. Andrew; Izzo, Luca; Kann, D. Alexander; McCully, Curtis; Pellegrino, Craig; de Ugarte Postigo, Antonio; Valenti, Stefano; Wang, Xiaofeng; Wheeler, J. C.; Xiang, Danfeng; Sarneczky, K.; Bodi, A.; Cseh, B.; Tarczay-Nehez, D.; Kriskovics, L.; Ordasi, A.; Pal, A.; Szakats, R.; Vida, K.
In: Astrophysical Journal, Vol. 915, No. 2, 121, 15.07.2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The Exotic Type Ic Broad-lined Supernova SN 2018gep
T2 - Blurring the Line between Supernovae and Fast Optical Transients
AU - Pritchard, T. A.
AU - Bensch, Katarzyna
AU - Modjaz, Maryam
AU - Williamson, Marc
AU - Thone, Christina C.
AU - Vinko, J.
AU - Bianco, Federica B.
AU - Bostroem, K. Azalee
AU - Burke, Jamison
AU - Garcia-Benito, Ruben
AU - Galbany, L.
AU - Hiramatsu, Daichi
AU - Howell, D. Andrew
AU - Izzo, Luca
AU - Kann, D. Alexander
AU - McCully, Curtis
AU - Pellegrino, Craig
AU - de Ugarte Postigo, Antonio
AU - Valenti, Stefano
AU - Wang, Xiaofeng
AU - Wheeler, J. C.
AU - Xiang, Danfeng
AU - Sarneczky, K.
AU - Bodi, A.
AU - Cseh, B.
AU - Tarczay-Nehez, D.
AU - Kriskovics, L.
AU - Ordasi, A.
AU - Pal, A.
AU - Szakats, R.
AU - Vida, K.
PY - 2021/7/15
Y1 - 2021/7/15
N2 - In the last decade a number of rapidly evolving transients have been discovered that are not easily explained by traditional supernova models. We present optical and UV data on one such object, SN 2018gep, that displayed a fast rise with a mostly featureless blue continuum around peak, and evolved to develop broad features typical of an SN Ic-bl while retaining significant amounts of blue flux throughout its observations. This blue excess is most evident in its near-UV flux, which is over 4 mag brighter than other stripped-envelope supernovae, and is still visible in optical g-r colors. Its fast rise time of t (rise,V ) = 5.6 +/- 0.5 days puts it squarely in the emerging class of Fast Evolving Luminous Transients, or Fast Blue Optical Transients. With a peak absolute magnitude of M ( v ) = -19.53 +/- 0.23 mag it is on the extreme end of both the rise time and peak magnitude distribution for SNe Ic-bl. These observations are consistent with a simple SN Ic-bl model that has an additional form of energy injection at early times that drives the observed rapid, blue rise. We show that SN 2018gep and the literature SN iPTF16asu have similar photometric and spectroscopic properties and that they overall share many similarities with both SNe Ic-bl and Fast Evolving Transients. Based on our SN 2018gep host galaxy data we derive a number of properties, and we show that the derived host galaxy properties for both SN 2018gep and iPTF16asu are consistent with the SNe Ic-bl and gamma-ray burst/supernova sample while being on the extreme edge of the observed Fast Evolving Transient sample.
AB - In the last decade a number of rapidly evolving transients have been discovered that are not easily explained by traditional supernova models. We present optical and UV data on one such object, SN 2018gep, that displayed a fast rise with a mostly featureless blue continuum around peak, and evolved to develop broad features typical of an SN Ic-bl while retaining significant amounts of blue flux throughout its observations. This blue excess is most evident in its near-UV flux, which is over 4 mag brighter than other stripped-envelope supernovae, and is still visible in optical g-r colors. Its fast rise time of t (rise,V ) = 5.6 +/- 0.5 days puts it squarely in the emerging class of Fast Evolving Luminous Transients, or Fast Blue Optical Transients. With a peak absolute magnitude of M ( v ) = -19.53 +/- 0.23 mag it is on the extreme end of both the rise time and peak magnitude distribution for SNe Ic-bl. These observations are consistent with a simple SN Ic-bl model that has an additional form of energy injection at early times that drives the observed rapid, blue rise. We show that SN 2018gep and the literature SN iPTF16asu have similar photometric and spectroscopic properties and that they overall share many similarities with both SNe Ic-bl and Fast Evolving Transients. Based on our SN 2018gep host galaxy data we derive a number of properties, and we show that the derived host galaxy properties for both SN 2018gep and iPTF16asu are consistent with the SNe Ic-bl and gamma-ray burst/supernova sample while being on the extreme edge of the observed Fast Evolving Transient sample.
KW - INTEGRAL FIELD SPECTROSCOPY
KW - MASS-METALLICITY RELATION
KW - POTSDAM MULTIAPERTURE SPECTROPHOTOMETER
KW - RAPIDLY EVOLVING TRANSIENTS
KW - SUPERLUMINOUS SUPERNOVAE
KW - STRIPPED-ENVELOPE
KW - HOST GALAXIES
KW - LIGHT CURVES
KW - X-RAY
KW - SHOCK BREAKOUT
U2 - 10.3847/1538-4357/ac00bc
DO - 10.3847/1538-4357/ac00bc
M3 - Journal article
VL - 915
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 121
ER -
ID: 276266448