Forbidden hugs in pandemic times III. Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631
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Forbidden hugs in pandemic times III. Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631. / Cai, Y-Z; Pastorello, A.; Fraser, M.; Wang, X-F; Filippenko, A.; Reguitti, A.; Patra, K. C.; Goranskij, V. P.; Barsukova, E. A.; Brink, T. G.; Elias-Rosa, N.; Stevance, H. F.; Zheng, W.; Yang, Y.; Atapin, K. E.; Benetti, S.; de Boer, T. J. L.; Bose, S.; Burke, J.; Byrne, R.; Cappellaro, E.; Chambers, K. C.; Chen, W-L; Emami, N.; Gao, H.; Hiramatsu, D.; Howell, D. A.; Huber, M. E.; Kankare, E.; Kelly, P. L.; Kotak, R.; Kravtsov, T.; Lander, V. Yu; Li, Z-T; Lin, C-C; Lundqvist, P.; Magnier, E. A.; Malygin, E. A.; Maslennikova, N. A.; Matilainen, K.; Mazzali, P. A.; McCully, C.; Mo, J.; Moran, S.; Newsome, M.; Oparin, D.; Gonzalez, E. Padilla; Reynolds, T. M.; Shatsky, N.; Smartt, S. J.; Smith, K. W.; Stritzinger, M. D.; Tatarnikov, A. M.; Terreran, G.; Uklein, R.; Valerin, G.; Vallely, P. J.; Vozyakova, O. V.; Wainscoat, R.; Yan, S-Y; Zhang, J-J; Zhang, T-M; Zheltoukhov, S. G.; Dastidar, R.; Fulton, M.; Galbany, L.; Gangopadhyay, A.; Ge, H-W; Gutierrez, C. P.; Lin, H.; Misra, K.; Ou, Z-W; Salmaso, Nico; Tartaglia, L.; Xiao, L.; Zhang, X-H.
In: Astronomy & Astrophysics, Vol. 667, A4, 28.10.2022.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Forbidden hugs in pandemic times III. Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631
AU - Cai, Y-Z
AU - Pastorello, A.
AU - Fraser, M.
AU - Wang, X-F
AU - Filippenko, A.
AU - Reguitti, A.
AU - Patra, K. C.
AU - Goranskij, V. P.
AU - Barsukova, E. A.
AU - Brink, T. G.
AU - Elias-Rosa, N.
AU - Stevance, H. F.
AU - Zheng, W.
AU - Yang, Y.
AU - Atapin, K. E.
AU - Benetti, S.
AU - de Boer, T. J. L.
AU - Bose, S.
AU - Burke, J.
AU - Byrne, R.
AU - Cappellaro, E.
AU - Chambers, K. C.
AU - Chen, W-L
AU - Emami, N.
AU - Gao, H.
AU - Hiramatsu, D.
AU - Howell, D. A.
AU - Huber, M. E.
AU - Kankare, E.
AU - Kelly, P. L.
AU - Kotak, R.
AU - Kravtsov, T.
AU - Lander, V. Yu
AU - Li, Z-T
AU - Lin, C-C
AU - Lundqvist, P.
AU - Magnier, E. A.
AU - Malygin, E. A.
AU - Maslennikova, N. A.
AU - Matilainen, K.
AU - Mazzali, P. A.
AU - McCully, C.
AU - Mo, J.
AU - Moran, S.
AU - Newsome, M.
AU - Oparin, D.
AU - Gonzalez, E. Padilla
AU - Reynolds, T. M.
AU - Shatsky, N.
AU - Smartt, S. J.
AU - Smith, K. W.
AU - Stritzinger, M. D.
AU - Tatarnikov, A. M.
AU - Terreran, G.
AU - Uklein, R.
AU - Valerin, G.
AU - Vallely, P. J.
AU - Vozyakova, O. V.
AU - Wainscoat, R.
AU - Yan, S-Y
AU - Zhang, J-J
AU - Zhang, T-M
AU - Zheltoukhov, S. G.
AU - Dastidar, R.
AU - Fulton, M.
AU - Galbany, L.
AU - Gangopadhyay, A.
AU - Ge, H-W
AU - Gutierrez, C. P.
AU - Lin, H.
AU - Misra, K.
AU - Ou, Z-W
AU - Salmaso, Nico
AU - Tartaglia, L.
AU - Xiao, L.
AU - Zhang, X-H
PY - 2022/10/28
Y1 - 2022/10/28
N2 - We present an observational study of the luminous red nova (LRN) AT 2021biy in the nearby galaxy NGC 4631. The field of the object was routinely imaged during the pre-eruptive stage by synoptic surveys, but the transient was detected only at a few epochs from similar to 231 days before maximum brightness. The LRN outburst was monitored with unprecedented cadence both photometrically and spectroscopically. AT 2021biy shows a short-duration blue peak, with a bolometric luminosity of similar to 1.6 x 10(41) erg s(-1), followed by the longest plateau among LRNe to date, with a duration of 210 days. A late-time hump in the light curve was also observed, possibly produced by a shell-shell collision. AT 2021biy exhibits the typical spectral evolution of LRNe. Early-time spectra are characterised by a blue continuum and prominent H emission lines. Then, the continuum becomes redder, resembling that of a K-type star with a forest of metal absorption lines during the plateau phase. Finally, late-time spectra show a very red continuum (T-BB approximate to 2050 K) with molecular features (e.g., TiO) resembling those of M-type stars. Spectropolarimetric analysis indicates that AT 2021biy has local dust properties similar to those of V838 Mon in the Milky Way Galaxy. Inspection of archival Hubble Space Telescope data taken on 2003 August 3 reveals a similar to 20 M-circle dot progenitor candidate with log (L/L-circle dot)= 5.0 dex and T-eff = 5900 K at solar metallicity. The above luminosity and colour match those of a luminous yellow supergiant. Most likely, this source is a close binary, with a 17-24 M(circle dot)( )primary component.
AB - We present an observational study of the luminous red nova (LRN) AT 2021biy in the nearby galaxy NGC 4631. The field of the object was routinely imaged during the pre-eruptive stage by synoptic surveys, but the transient was detected only at a few epochs from similar to 231 days before maximum brightness. The LRN outburst was monitored with unprecedented cadence both photometrically and spectroscopically. AT 2021biy shows a short-duration blue peak, with a bolometric luminosity of similar to 1.6 x 10(41) erg s(-1), followed by the longest plateau among LRNe to date, with a duration of 210 days. A late-time hump in the light curve was also observed, possibly produced by a shell-shell collision. AT 2021biy exhibits the typical spectral evolution of LRNe. Early-time spectra are characterised by a blue continuum and prominent H emission lines. Then, the continuum becomes redder, resembling that of a K-type star with a forest of metal absorption lines during the plateau phase. Finally, late-time spectra show a very red continuum (T-BB approximate to 2050 K) with molecular features (e.g., TiO) resembling those of M-type stars. Spectropolarimetric analysis indicates that AT 2021biy has local dust properties similar to those of V838 Mon in the Milky Way Galaxy. Inspection of archival Hubble Space Telescope data taken on 2003 August 3 reveals a similar to 20 M-circle dot progenitor candidate with log (L/L-circle dot)= 5.0 dex and T-eff = 5900 K at solar metallicity. The above luminosity and colour match those of a luminous yellow supergiant. Most likely, this source is a close binary, with a 17-24 M(circle dot)( )primary component.
KW - binaries: close
KW - stars: winds, outflows
KW - stars: individual: AT 2021biy
KW - ELECTRON-CAPTURE SUPERNOVAE
KW - RICH CIRCUMSTELLAR MEDIUM
KW - SN HUNT 248
KW - STELLAR MERGERS
KW - V838 MONOCEROTIS
KW - V4332 SAGITTARII
KW - DUSTY AFTERMATH
KW - DATA RELEASE
KW - EVOLUTION
KW - TRANSIENT
U2 - 10.1051/0004-6361/202244393
DO - 10.1051/0004-6361/202244393
M3 - Journal article
VL - 667
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
M1 - A4
ER -
ID: 326352645