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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10421705" target="_blank" >RIV/00216208:11320/20:10421705 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=_Y39H9Y9cy" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=_Y39H9Y9cy</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201937286" target="_blank" >10.1051/0004-6361/201937286</a>

Result language

angličtina

Original language name

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

Original language description

Context. AT 2019abn was discovered in the nearby M51 galaxy by the Zwicky Transient Facility at more than two magnitudes and around three weeks prior to its optical peak.Aims. We aim to conduct a detailed photometric and spectroscopic follow-up campaign for AT 2019abn, with early discovery allowing for significant pre-maximum observations of an intermediate luminosity red transient (ILRT) for the first time.Methods. This work is based on the analysis of uBVri &apos; z &apos; H photometry and low-resolution spectroscopy using the Liverpool Telescope, medium-resolution spectroscopy with the Gran Telescopio Canarias (GTC), and near-infrared imaging with the GTC and the Nordic Optical Telescope.Results. 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 &apos;=-13.1, although it is subject to significant reddening from dust in M51, implying an intrinsic M-r &apos;similar to -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 such species as FeI, NiI and LiI. A spectrum taken around peak brightness shows narrow, low-velocity absorption lines, which we interpret as likely to originate from pre-existing circumstellar material.Conclusions. We conclude that while there are some peculiarities, such as the radius evolution, AT 2019abn fits in well overall with the ILRT class of objects and is the most luminous member of the class seen to date.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/LTAUSA18093" target="_blank" >LTAUSA18093: Time-variability in astronomy: participation in project All-Sky Automated Survey for Supernovae</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy &amp; Astrophysics

ISSN

0004-6361

e-ISSN

—

Volume of the periodical

637

Issue of the periodical within the volume

May

Country of publishing house

FR - FRANCE

Number of pages

13

Pages from-to

A20

UT code for WoS article

000536755500001

EID of the result in the Scopus database

2-s2.0-85088112036