Artículo
The blue supergiant progenitor of the Supernova Imposter at 2019krl
Andrews, Jennifer E.; Jencson, Jacob E.; Van Dyk, Schuyler D.; Smith, Nathan; Neustadt, Jack M. M.; Sand, David J.; Kreckel, K.; Kochanek, C.S.; Valenti, S.; Strader, Jay; Bersten, Melina Cecilia
; Blanc, Guillermo A.; Bostroem, K. Azalee; Brink, Thomas G.; Emsellem, Eric; Filippenko, Alexei V.; Folatelli, Gaston
; Kasliwal, Mansi; Masci, Frank J.; McElroy, Rebecca; Milisavljevic, Dan; Santoro, Francesco; Szalai, Tamás
Fecha de publicación:
08/2021
Editorial:
IOP Publishing
Revista:
Astrophysical Journal
ISSN:
0004-637X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Extensive archival Hubble Space Telescope, Spitzer Space Telescope, and Large Binocular Telescope imaging of the recent intermediate-luminosity transient, AT 2019krl in M74, reveal a bright optical and mid-infrared progenitor star. While the optical peak of the event was missed, a peak was detected in the infrared with an absolute magnitude of M 4.5 μm = -18.4 mag, leading us to infer a visual-wavelength peak absolute magnitude of -13.5 to -14.5. The pre-discovery light curve indicated no outbursts over the previous 16 yr. The colors, magnitudes, and inferred temperatures of the progenitor best match a 13-14 M o˙ yellow or blue supergiant (BSG) if only foreground extinction is taken into account, or a hotter and more massive star if any additional local extinction is included. A pre-eruption spectrum of the star reveals strong Hα and [N ii] emission with wings extending to 2000 km s-1. The post-eruption spectrum is fairly flat and featureless with only Hα, Na i D, [Ca ii], and the Ca ii triplet in emission. As in many previous intermediate-luminosity transients, AT 2019krl shows remarkable observational similarities to luminous blue variable (LBV) giant eruptions, SN 2008S-like events, and massive-star mergers. However, the information about the pre-eruption star favors either a relatively unobscured BSG or a more extinguished LBV with M > 20 Mo˙ likely viewed pole-on.
Palabras clave:
SUPERNOVAS
,
Hydrodynamics
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Andrews, Jennifer E.; Jencson, Jacob E.; Van Dyk, Schuyler D.; Smith, Nathan; Neustadt, Jack M. M.; et al.; The blue supergiant progenitor of the Supernova Imposter at 2019krl; IOP Publishing; Astrophysical Journal; 917; 2; 8-2021; 1-22
Compartir
Altmétricas