TY - JOUR
T1 - SN 2020udy
T2 - an SN Iax with strict limits on interaction consistent with a helium-star companion
AU - Maguire, Kate
AU - Magee, Mark R.
AU - Leloudas, Giorgos
AU - Miller, Adam A.
AU - Dimitriadis, Georgios
AU - Pursiainen, Miika
AU - Bulla, Mattia
AU - De, Kishalay
AU - Gal-Yam, Avishay
AU - Perley, Daniel A.
AU - Fremling, Christoffer
AU - Karambelkar, Viraj R.
AU - Nordin, Jakob
AU - Reusch, Simeon
AU - Schulze, Steve
AU - Sollerman, Jesper
AU - Terreran, Giacomo
AU - Yang, Yi
AU - Bellm, Eric C.
AU - Groom, Steven L.
AU - Kasliwal, Mansi M.
AU - Kulkarni, Shrinivas R.
AU - Lacroix, Leander
AU - Masci, Frank J.
AU - Purdum, Josiah N.
AU - Sharma, Yashvi
AU - Smith, Roger
N1 - Publisher Copyright:
© 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2023
Y1 - 2023
N2 - Early observations of transient explosions can provide vital clues to their progenitor origins. In this paper, we present the nearby Type Iax (02cx-like) supernova (SN), SN 2020udy, that was discovered within hours (∼7 h) of estimated first light. An extensive data set of ultra-violet, optical, and near-infrared observations was obtained, covering out to ∼150 d after explosion. SN 2020udy peaked at -17.86 ± 0.43 mag in the r band and evolved similarly to other 'luminous' SNe Iax, such as SNe 2005hk and 2012Z. Its well-sampled early light curve allows strict limits on companion interaction to be placed. Main-sequence companion stars with masses of 2 and 6 M⊙ are ruled out at all viewing angles, while a helium-star companion is allowed from a narrow range of angles (140-180° away from the companion). The spectra and light curves of SN 2020udy are in good agreement with those of the 'N5def' deflagration model of a near Chandrasekhar-mass carbon-oxygen white dwarf. However, as has been seen in previous studies of similar luminosity events, SN 2020udy evolves slower than the model. Broad-band linear polarization measurements taken at and after peak are consistent with no polarization, in agreement with the predictions of the companion-star configuration from the early light-curve measurements. The host galaxy environment is low metallicity and is consistent with a young stellar population. Overall, we find the most plausible explosion scenario to be the incomplete disruption of a CO white dwarf near the Chandrasekhar-mass limit, with a helium-star companion.
AB - Early observations of transient explosions can provide vital clues to their progenitor origins. In this paper, we present the nearby Type Iax (02cx-like) supernova (SN), SN 2020udy, that was discovered within hours (∼7 h) of estimated first light. An extensive data set of ultra-violet, optical, and near-infrared observations was obtained, covering out to ∼150 d after explosion. SN 2020udy peaked at -17.86 ± 0.43 mag in the r band and evolved similarly to other 'luminous' SNe Iax, such as SNe 2005hk and 2012Z. Its well-sampled early light curve allows strict limits on companion interaction to be placed. Main-sequence companion stars with masses of 2 and 6 M⊙ are ruled out at all viewing angles, while a helium-star companion is allowed from a narrow range of angles (140-180° away from the companion). The spectra and light curves of SN 2020udy are in good agreement with those of the 'N5def' deflagration model of a near Chandrasekhar-mass carbon-oxygen white dwarf. However, as has been seen in previous studies of similar luminosity events, SN 2020udy evolves slower than the model. Broad-band linear polarization measurements taken at and after peak are consistent with no polarization, in agreement with the predictions of the companion-star configuration from the early light-curve measurements. The host galaxy environment is low metallicity and is consistent with a young stellar population. Overall, we find the most plausible explosion scenario to be the incomplete disruption of a CO white dwarf near the Chandrasekhar-mass limit, with a helium-star companion.
KW - Supernovae: general
KW - Supernovae: individual: SN 2020udy
KW - Techniques: photometric
KW - Techniques: polarimetric
KW - Techniques: spectroscopic
KW - White dwarfs
U2 - 10.1093/mnras/stad2316
DO - 10.1093/mnras/stad2316
M3 - Journal article
AN - SCOPUS:85169878825
SN - 0035-8711
VL - 525
SP - 1210
EP - 1228
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -