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AT 2019abn: multi-wavelength observations of the first 200 days

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AT 2019abn : multi-wavelength observations of the first 200 days. / Williams, S. C.; Jones, D.; Pessev, P.; Geier, S.; Corradi, R. L. M.; Hook, I. M.; Darnley, M. J.; Pejcha, O.; Núñez, A.; Meingast, S.; Moran, S.

In: Astronomy and Astrophysics, Vol. 637, A20, 01.05.2020.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Williams, SC, Jones, D, Pessev, P, Geier, S, Corradi, RLM, Hook, IM, Darnley, MJ, Pejcha, O, Núñez, A, Meingast, S & Moran, S 2020, 'AT 2019abn: multi-wavelength observations of the first 200 days', Astronomy and Astrophysics, vol. 637, A20. https://doi.org/10.1051/0004-6361/201937286

APA

Williams, S. C., Jones, D., Pessev, P., Geier, S., Corradi, R. L. M., Hook, I. M., Darnley, M. J., Pejcha, O., Núñez, A., Meingast, S., & Moran, S. (2020). AT 2019abn: multi-wavelength observations of the first 200 days. Astronomy and Astrophysics, 637, [A20]. https://doi.org/10.1051/0004-6361/201937286

Vancouver

Williams SC, Jones D, Pessev P, Geier S, Corradi RLM, Hook IM et al. AT 2019abn: multi-wavelength observations of the first 200 days. Astronomy and Astrophysics. 2020 May 1;637. A20. https://doi.org/10.1051/0004-6361/201937286

Author

Williams, S. C. ; Jones, D. ; Pessev, P. ; Geier, S. ; Corradi, R. L. M. ; Hook, I. M. ; Darnley, M. J. ; Pejcha, O. ; Núñez, A. ; Meingast, S. ; Moran, S. / AT 2019abn : multi-wavelength observations of the first 200 days. In: Astronomy and Astrophysics. 2020 ; Vol. 637.

Bibtex

@article{466a5b8e00c24b85812aa3f43f8c4f85,
title = "AT 2019abn: multi-wavelength observations of the first 200 days",
abstract = "AT 2019abn was discovered in the nearby M51 galaxy, by the Zwicky Transient Facility more than two magnitudes, and around 3 weeks, prior to its optical peak. We aimed to conduct a detailed photometric and spectroscopic follow-up campaign for AT 2019abn, with the early discovery allowing significant pre-maximum observations of an intermediate luminosity red transient (ILRT) for the first time. This work is based around the analysis of u'BVr'i'z'H photometry and low-resolution spectroscopy with the Liverpool Telescope, medium-resolution spectroscopy with Gran Telescopio Canarias (GTC) and near-infrared imaging with GTC and the Nordic Optical Telescope. We present the most detailed optical light curve of an ILRT to date, with multi-band photometry starting around three weeks before peak brightness. The transient peaked at an observed absolute magnitude of M_r=-13.1, although it is subject to significant reddening from dust in M51, implying an intrinsic M_r~-15.2. The initial light curve showed a linear, achromatic rise in magnitude, before becoming bluer at peak. After peak brightness the transient gradually cooled. This is reflected in our spectra which at later times show absorption from species such as Fe I, Ni I and Li I. A spectrum taken around peak brightness shows narrow, low-velocity absorption lines, which we interpret as likely originating from pre-existing circumstellar material. We conclude that, while there are some peculiarities, such as the radius evolution, AT 2019abn overall fits in well with the ILRT class of objects, and is the most luminous member of the class seen to date.",
keywords = "Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies",
author = "Williams, {S. C.} and D. Jones and P. Pessev and S. Geier and Corradi, {R. L. M.} and Hook, {I. M.} and Darnley, {M. J.} and O. Pejcha and A. N{\'u}{\~n}ez and S. Meingast and S. Moran",
note = "The final, definitive version of this article has been published in the Journal, Astronomy and Astrophysics, 637, 2020, {\textcopyright} EDP Sciences. ",
year = "2020",
month = may,
day = "1",
doi = "10.1051/0004-6361/201937286",
language = "English",
volume = "637",
journal = "Astronomy and Astrophysics",
issn = "1432-0746",
publisher = "EDP Sciences",

}

RIS

TY - JOUR

T1 - AT 2019abn

T2 - multi-wavelength observations of the first 200 days

AU - Williams, S. C.

AU - Jones, D.

AU - Pessev, P.

AU - Geier, S.

AU - Corradi, R. L. M.

AU - Hook, I. M.

AU - Darnley, M. J.

AU - Pejcha, O.

AU - Núñez, A.

AU - Meingast, S.

AU - Moran, S.

N1 - The final, definitive version of this article has been published in the Journal, Astronomy and Astrophysics, 637, 2020, © EDP Sciences.

PY - 2020/5/1

Y1 - 2020/5/1

N2 - AT 2019abn was discovered in the nearby M51 galaxy, by the Zwicky Transient Facility more than two magnitudes, and around 3 weeks, prior to its optical peak. We aimed to conduct a detailed photometric and spectroscopic follow-up campaign for AT 2019abn, with the early discovery allowing significant pre-maximum observations of an intermediate luminosity red transient (ILRT) for the first time. This work is based around the analysis of u'BVr'i'z'H photometry and low-resolution spectroscopy with the Liverpool Telescope, medium-resolution spectroscopy with Gran Telescopio Canarias (GTC) and near-infrared imaging with GTC and the Nordic Optical Telescope. We present the most detailed optical light curve of an ILRT to date, with multi-band photometry starting around three weeks before peak brightness. The transient peaked at an observed absolute magnitude of M_r=-13.1, although it is subject to significant reddening from dust in M51, implying an intrinsic M_r~-15.2. The initial light curve showed a linear, achromatic rise in magnitude, before becoming bluer at peak. After peak brightness the transient gradually cooled. This is reflected in our spectra which at later times show absorption from species such as Fe I, Ni I and Li I. A spectrum taken around peak brightness shows narrow, low-velocity absorption lines, which we interpret as likely originating from pre-existing circumstellar material. We conclude that, while there are some peculiarities, such as the radius evolution, AT 2019abn overall fits in well with the ILRT class of objects, and is the most luminous member of the class seen to date.

AB - AT 2019abn was discovered in the nearby M51 galaxy, by the Zwicky Transient Facility more than two magnitudes, and around 3 weeks, prior to its optical peak. We aimed to conduct a detailed photometric and spectroscopic follow-up campaign for AT 2019abn, with the early discovery allowing significant pre-maximum observations of an intermediate luminosity red transient (ILRT) for the first time. This work is based around the analysis of u'BVr'i'z'H photometry and low-resolution spectroscopy with the Liverpool Telescope, medium-resolution spectroscopy with Gran Telescopio Canarias (GTC) and near-infrared imaging with GTC and the Nordic Optical Telescope. We present the most detailed optical light curve of an ILRT to date, with multi-band photometry starting around three weeks before peak brightness. The transient peaked at an observed absolute magnitude of M_r=-13.1, although it is subject to significant reddening from dust in M51, implying an intrinsic M_r~-15.2. The initial light curve showed a linear, achromatic rise in magnitude, before becoming bluer at peak. After peak brightness the transient gradually cooled. This is reflected in our spectra which at later times show absorption from species such as Fe I, Ni I and Li I. A spectrum taken around peak brightness shows narrow, low-velocity absorption lines, which we interpret as likely originating from pre-existing circumstellar material. We conclude that, while there are some peculiarities, such as the radius evolution, AT 2019abn overall fits in well with the ILRT class of objects, and is the most luminous member of the class seen to date.

KW - Astrophysics - Solar and Stellar Astrophysics

KW - Astrophysics - Astrophysics of Galaxies

U2 - 10.1051/0004-6361/201937286

DO - 10.1051/0004-6361/201937286

M3 - Journal article

VL - 637

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 1432-0746

M1 - A20

ER -