2019A&A...625L...8P


Query : 2019A&A...625L...8P

2019A&A...625L...8P - Astronomy and Astrophysics, volume 625, L8-8 (2019/5-1)

The evolution of luminous red nova AT 2017jfs in NGC 4470.

PASTORELLO A., CHEN T.-W., CAI Y.-Z., MORALES-GAROFFOLO A., CANO Z., MASON E., BARSUKOVA E.A., BENETTI S., BERTON M., BOSE S., BUFANO F., CALLIS E., CANNIZZARO G., CARTIER R., CHEN P., DONG S., DYRBYE S., ELIAS-ROSA N., FLORS A., FRASER M., GEIER S., GORANSKIJ V.P., KANN D.A., KUNCARAYAKTI H., ONORI F., REGUITTI A., REYNOLDS T., LOSADA I.R., SAGUES CARRACEDO A., SCHWEYER T., SMARTT S.J., TATARNIKOV A.M., VALEEV A.F., VOGL C., WEVERS T., DE UGARTE POSTIGO A., IZZO L., INSERRA C., KANKARE E., MAGUIRE K., SMITH K.W., STALDER B., TARTAGLIA L., THONE C.C., VALERIN G. and YOUNG D.R.

Abstract (from CDS):

We present the results of our photometric and spectroscopic follow-up of the intermediate-luminosity optical transient AT 2017jfs. At peak, the object reaches an absolute magnitude of Mg=-15.46±0.15mag and a bolometric luminosity of 5.5x1041erg/s. Its light curve has the double-peak shape typical of luminous red novae (LRNe), with a narrow first peak bright in the blue bands, while the second peak is longer-lasting and more luminous in the red and near-infrared (NIR) bands. During the first peak, the spectrum shows a blue continuum with narrow emission lines of H and Fe II. During the second peak, the spectrum becomes cooler, resembling that of a K-type star, and the emission lines are replaced by a forest of narrow lines in absorption. About 5 months later, while the optical light curves are characterized by a fast linear decline, the NIR ones show a moderate rebrightening, observed until the transient disappears in solar conjunction. At these late epochs, the spectrum becomes reminiscent of that of M-type stars, with prominent molecular absorption bands. The late-time properties suggest the formation of some dust in the expanding common envelope or an IR echo from foreground pre-existing dust. We propose that the object is a common-envelope transient, possibly the outcome of a merging event in a massive binary, similar to NGC 4490-2011OT1.

Abstract Copyright: © ESO 2019

Journal keyword(s): binaries: close - stars: massive - supernovae: individual: AT 2017jfs - supernovae: individual: NGC 4490-2011OT1 - stars: winds, outflows

VizieR on-line data: <Available at CDS (J/A+A/625/L8): tablea1.dat>

CDS comments: Fig.3 UGC12307-2013OT1 may be a misprint for NAME UGC 2773 OT2009-1 in SIMBAD.

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 440 GiG 01 12 48.496 -58 16 56.03   13.75   12.66   ~ 19 0
2 NAME UGC 2773 OT2009-1 SN? 03 32 07.24 +47 47 39.6           ~ 48 1
3 V* V838 Mon CV* 07 04 04.8222936785 -03 50 50.637499515   15.5   15.18 14.51 M10+B3V 383 0
4 NAME M85 OT2006-1 No* 12 25 23.82 +18 10 56.2     19.30     ~ 59 1
5 SN 2017jfs SN* 12 29 37.78 +07 49 35.1           SNIIn 12 0
6 NGC 4470 H2G 12 29 37.8070254595 +07 49 27.286182613   12.9       ~ 209 0
7 NGC 4490 GiP 12 30 36.368 +41 38 37.07 10.03 10.22 9.79     ~ 538 3
8 NAME NGC 4490-OT2011 ev 12 30 41.85 +41 37 49.8           ~ 31 0
9 NAME M101 OT2015-1 SN? 14 02 16.78 +54 26 20.5   19.19 17.57 16.92 16.26 ~ 36 0
10 PSN J14595947+0154262 SN? 14 59 59.47 +01 54 26.6           ~ 28 1
11 V* V1309 Sco CV* 17 57 32.9383021931 -30 43 09.967391199   16.9   14.8   ~ 194 0
12 EWS 2002-BLG-360 CV* 17 57 38.98752 -29 46 05.1636           ~ 31 0
13 V* V4332 Sgr CV* 18 50 36.6959119600 -21 23 28.927014456         14.37 K8/M0e 152 0
14 SN 2008S ev 20 34 45.33 +60 05 58.4   19.89 18.79 17.93   SNIIn? 220 1
15 NAME South America H2G 22 51 49.307 -17 52 23.96   16.97       ~ 295 3
16 NAME Local Group GrG ~ ~           ~ 7354 0

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2021.09.21-09:24:21

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