2021A&A...647A..93P


Query : 2021A&A...647A..93P

2021A&A...647A..93P - Astronomy and Astrophysics, volume 647A, 93-93 (2021/3-1)

Forbidden hugs in pandemic times. II. The luminous red nova variety: AT 2020hat and AT 2020kog.

PASTORELLO A., VALERIN G., FRASER M., ELIAS-ROSA N., VALENTI S., REGUITTI A., MAZZALI P.A., AMARO R.C., ANDREWS J.E., DONG Y., JENCSON J., LUNDQUIST M., REICHART D.E., SAND D.J., WYATT S., SMARTT S.J., SMITH K.W., SRIVASTAV S., CAI Y.-Z., CAPPELLARO E., HOLMBO S., FIORE A., JONES D., KANKARE E., KARAMEHMETOGLU E., LUNDQVIST P., MORALES-GAROFFOLO A., REYNOLDS T.M., STRITZINGER M.D., WILLIAMS S.C., CHAMBERS K.C., DE BOER T.J.L., HUBER M.E., REST A. and WAINSCOAT R.

Abstract (from CDS):

We present the results of our monitoring campaigns of the luminous red novae (LRNe) AT 2020hat in NGC 5068 and AT 2020kog in NGC 6106. The two objects were imaged (and detected) before their discovery by routine survey operations. They show a general trend of slow luminosity rise, lasting at least a few months. The subsequent major LRN outbursts were extensively followed in photometry and spectroscopy. The light curves present an initial short-duration peak, followed by a redder plateau phase. AT 2020kog is a moderately luminous event peaking at ∼7 x 1040erg/s, while AT 2020hat is almost one order of magnitude fainter than AT 2020kog, although it is still more luminous than V838 Mon. In analogy with other LRNe, the spectra of AT 2020kog change significantly with time. They resemble those of type IIn supernovae at early phases, then they become similar to those of K-type stars during the plateau, and to M-type stars at very late phases. In contrast, AT 2020hat already shows a redder continuum at early epochs, and its spectrum shows the late appearance of molecular bands. A moderate-resolution spectrum of AT 2020hat taken at +37 d after maximum shows a forest of narrow P Cygni lines of metals with velocities of 180km/s, along with an Hα emission with a full-width at half-maximum velocity of 250km/s. For AT 2020hat, a robust constraint on its quiescent progenitor is provided by archival images of the Hubble Space Telescope. The progenitor is clearly detected as a mid-K type star, with an absolute magnitude of MF606W=-3.33±0.09mag and a colour of F606W-F814W=1.14±0.05mag, which are inconsistent with the expectations from a massive star that could later produce a core-collapse supernova. Although quite peculiar, the two objects nicely match the progenitor versus light curve absolute magnitude correlations discussed in the literature.

Abstract Copyright: © ESO 2021

Journal keyword(s): binaries: close - stars: winds - outflows - stars: individual: AT 2020hat - stars: individual: AT 2020kog - stars: individual: V1309 Sco - stars: individual: V838 Mon

VizieR on-line data: <Available at CDS (J/A+A/647/A93): tablee1.dat tablee2.dat>

CDS comments: UGC12307-2013OT1 may be a misprint for NAME UGC 2773 OT2009-1 in SIMBAD.

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 AT 2019zhd No* 00 40 37.905 +40 34 52.85           ~ 5 0
2 M31N 2015-01a No* 00 42 07.99 +40 55 01.1           ~ 49 0
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11795 1
4 NAME M31 RV No* 00 43 02.433 +41 12 56.17           M0 106 0
5 V* CK Per EB* 02 05 06.7519027848 +56 10 24.739492440           ~ 6 0
6 NAME UGC 2773 OT2009-1 SN? 03 32 07.24 +47 47 39.6           ~ 49 1
7 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4694 2
8 V* V838 Mon ** 07 04 04.8221494992 -03 50 50.648894412   15.5   15.18 14.51 M10+B3V 395 0
9 NAME NGC 3437-2011-OT1 SN? 10 52 34.53 +22 56 05.2           ~ 8 0
10 SN 1997bs ev 11 20 14.25 +12 58 19.6     17.13     SNIIn? 116 1
11 AT 2018hso ev 11 33 51.96 +53 07 07.1           ~ 8 0
12 NAME M85 OT2006-1 No* 12 25 23.82 +18 10 56.2     19.30     ~ 61 1
13 SN 2017jfs SN* 12 29 37.78 +07 49 35.1           SNIIn 16 0
14 NAME NGC 4490-OT2011 ev 12 30 41.85 +41 37 49.8           ~ 33 0
15 NGC 5068 G 13 18 54.807 -21 02 20.76 11.24 10.53 10.01 9.78 10.1 ~ 247 0
16 AT 2020hat SN? 13 19 01.927 -21 03 16.37           ~ 6 0
17 NAME M101 OT2015-1 SN? 14 02 16.78 +54 26 20.5   19.19 17.57 16.92 16.26 ~ 40 0
18 PSN J14595947+0154262 SN? 14 59 59.47 +01 54 26.6           ~ 31 1
19 NGC 6106 G 16 18 47.1730173576 +07 24 38.951833860   13.4       ~ 107 0
20 AT 2020kog ? 16 18 47.652 +07 25 16.86           ~ 4 0
21 V* V1309 Sco No* 17 57 32.9368332984 -30 43 09.965039880   16.9   14.8   ~ 210 0
22 EWS 2002-BLG-360 CV* 17 57 38.98752 -29 46 05.1636           ~ 33 0
23 V* V4332 Sgr CV* 18 50 36.6958376520 -21 23 28.925017944         14.37 K8/M0e 157 0
24 V* CK Vul CV* 19 47 37.9577343864 +27 18 41.792401368           ~ 121 0
25 AT 2014ej SN? 23 16 09.79 -42 34 57.5           ~ 7 0

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2022.05.24-11:54:38

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