J/A+A/671/A158 Three luminous red novae light curves (Pastorello+, 2023)
Forbidden hugs in pandemic times.
IV. Panchromatic evolution of three luminous red novae.
Pastorello A., Valerin G., Fraser M., Reguitti A., Elias-Rosa N.,
Filippenko A.V., Rojas-Bravo C., Tartaglia L., Reynolds T.M., Valenti S.,
Andrews J.E., Ashall C., Bostroem K.A., Brink T.G., Burke J., Cai Y.-Z.,
Cappellaro E., Coulter D.A., Dastidar R., Davis K.W., Dimitriadis G.,
Fiore A., Foley R.J., Fugazza D., Galbany L., Gangopadhyay A., Geier S.,
Gutierrez C.P., Haislip J., Hiramatsu D., Holmbo S., Howell D.A.,
Hsiao E.Y., Hung T., Jha S.W., Kankare E., Karamehmetoglu E.,
Kilpatrick C.D., Kotak R., Kouprianov V., Kravtsov T., Kumar S., Li Z.-T.,
Lundquist M.J., Lundqvist P., Matilainen K., Mazzali P.A., McCully C.,
Misra K., Morales-Garoffolo A., Moran S., Morrell N., Newsome M.,
Padilla Gonzalez E., Pan Y.-C., Pellegrino C., Phillips M.M., Pignata G.,
Piro A.L., Reichart D.E., Rest A., Salmaso I., Sand D.J., Siebert M.R.,
Smartt S.J., Smith K.W., Srivastav S., Stritzinger M.D., Taggart K.,
Tinyanont S., Yan S.-Y., Wang L., X.-F.Wang, Williams S.C., Wyatt S.,
Zhang T.-M., de Boer T., Chambers K., Gao H., Magnier E.
<Astron. Astrophys. 671, A158 (2023)>
=2023A&A...671A.158P 2023A&A...671A.158P (SIMBAD/NED BibCode)
ADC_Keywords: Novae ; Stars, bright ; Photometry, UBV ; Photometry, ugriz ;
Photometry, ultraviolet ; Photometry, infrared ; Photometry, HST
Keywords: binaries: close - stars: individual: AT 2018bwo -
stars: individual: AT 2021afy - stars: individual: AT 2021blu -
stars: winds, outflows
Abstract:
We present photometric and spectroscopic data on three extragalactic
luminous red novae (LRNe): AT 2018bwo, AT 2021afy, and AT 2021blu.
AT 2018bwo was discovered in NGC 45 (at about 6.8Mpc) a few weeks
after the outburst onset. During the monitoring period, the transient
reached a peak luminosity of 1040erg/s. AT 2021afy, hosted by
UGC 10043 (∼49.2Mpc), showed a double-peaked light curve, with the
two peaks reaching a similar luminosity of 2.1(±0.6)x1041erg/s.
Finally, for AT 2021blu in UGC 5829 (∼8.6Mpc), the pre-outburst phase
was well-monitored by several photometric surveys, and the object
showed a slow luminosity rise before the outburst. The light curve of
AT 2021blu was sampled with an unprecedented cadence until the object
disapeared behind the Sun, and it was then recovered at late phases.
The light curve of LRN AT 2021blu shows a double peak, with a
prominent early maximum reaching a luminosity of 6.5x1040erg/s,
which is half of that of AT 2021afy. The spectra of AT 2021afy and
AT 2021blu display the expected evolution for LRNe: a blue continuum
dominated by prominent Balmer lines in emission during the first peak,
and a redder continuum consistent with that of a K-type star with
narrow absorption metal lines during the second, broad maximum. The
spectra of AT 2018bwo are markedly different, with a very red
continuum dominated by broad molecular features in absorption. As
these spectra closely resemble those of LRNe after the second peak,
AT 2018bwo was probably discovered at the very late evolutionary
stages. This would explain its fast evolution and the spectral
properties compatible with that of an M-type star. From the analysis
of deep frames of the LRN sites years before the outburst, and
considerations of the light curves, the quiescent progenitor systems
of the three LRNe were likely massive, with primaries ranging from
about 13 solar masses for AT 2018bwo, to 13-18 solar masses for
AT 2021blu, and over 40 solar masses for AT 2021afy.
Description:
Table A1 contains the following broadband optical photometry of
AT 2018bwo.
Table A2 contains the following broadband optical photometry of
AT 2021afy.
Table A3 contains the following broadband optical photometry of
AT 2021blu.
Objects:
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RA (2000) DE Designation(s)
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00 14 01.68 -23 11 35.3 AT 2018bwo = ATLAS 18qgb
15 48 43.17 +21 51 09.5 AT 2021afy
10 42 34.34 +34 26 14.5 AT 2021blu = ZTF21aagppzg
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 94 484 Broadband magnitudes and errors: B,V,R,J,H,K are
in Vega magnitude scale; Sloan u,g,r,i,
ATLAS o, and Gaia G are in AB magnitude scale
tablea2.dat 81 242 Broadband magnitudes and errors: B,V,J,H,K are
in Vega magnitude scale; Sloan g,r,i,z, and
Pan-STARRS w are in AB magnitude scale.
tablea3.dat 100 1284 Broadband magnitudes and errors: UVW2,UVM2,UVW1,
U,B,V,J,H,K are in Vega magnitude scale;
Sloan u,g,r,i,z, Pan-STARRS w,y, ATLAS c,o and
Gaia G are in AB magnitude scale
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Byte-by-byte Description of file: tablea1.dat tablea2.dat tablea3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Date of the observation (yyyy-mm-dd)
12- 19 F8.2 --- MJD Modified Julian Date
21- 26 A6 --- Filter Broadband Filter
28 A1 --- l_mag Detection limit symbol
29- 34 F6.3 mag mag Magnitude in filter (1)
36- 40 F5.3 mag e_mag ? Magnitude error
42- 67 A26 --- Inst Instrumental configuration
69-100 A32 --- Notes Notes
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Note (1): for U,B,V,R,J,H,K and UVW2,UVM2,UVW1 : Vega magnitude scale,
for Sloan u,g,r,i, ATLAS c,o, and Gaia G, Pan-STARRS w,y : AB magnitude scale
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Acknowledgements:
Andrea Pastorello, andrea.pastorello(at)inaf.it
(End) Patricia Vannier [CDS] 18-Dec-2022