2016MNRAS.458..950S


Query : 2016MNRAS.458..950S

2016MNRAS.458..950S - Mon. Not. R. Astron. Soc., 458, 950-962 (2016/May-1)

Massive star mergers and the recent transient in NGC 4490: a more massive cousin of V838 Mon and V1309 Sco.

SMITH N., ANDREWS J.E., VAN DYK S.D., MAUERHAN J.C., KASLIWAL M.M., BOND H.E., FILIPPENKO A.V., CLUBB K.I., GRAHAM M.L., PERLEY D.A., JENCSON J., BALLY J., UBEDA L. and SABBI E.

Abstract (from CDS):

The Galactic transient V1309 Sco was the result of a merger in a low-mass star system, while V838 Mon was thought to be a similar merger event from a more massive B-type progenitor. In this paper, we study a recent optical and infrared (IR) transient discovered in the nearby galaxy NGC 4490 named NGC 4490-OT2011 (NGC 4490-OT hereafter), which appeared similar to these merger events (unobscured progenitor, irregular multi-peaked light curve, increasingly red colour, similar optical spectrum, IR excess at late times), but which had a higher peak luminosity and longer duration in outburst. NGC 4490-OT has less in common with the class of SN 2008S-like transients. A progenitor detected in pre-eruption Hubble Space Telescope (HST) images, combined with upper limits in the IR, requires a luminous and blue progenitor that has faded in late-time HST images. The same source was detected by Spitzer and ground-based data as a luminous IR (2-5 µm) transient, indicating a transition to a self-obscured state qualitatively similar to the evolution seen in other stellar mergers and in luminous blue variables. The post-outburst dust-obscured source is too luminous and too warm at late times to be explained with an IR echo, suggesting that the object survived the event. The luminosity of the enshrouded IR source is similar to that of the progenitor. Compared to proposed merger events, the more massive progenitor of NGC 4490-OT seems to extend a correlation between stellar mass and peak luminosity, and may suggest that both of these correlate with duration. We show that spectra of NGC 4490-OT and V838 Mon also resemble light-echo spectra of η Car, prompting us to speculate that η Car may be an extreme extension of this phenomenon.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): binaries: general - circumstellar matter - stars: evolution - stars: massive - stars: winds, outflows

Nomenclature: NAME NGC 4490-OT2011 N=1.

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12039 1
2 NAME M31 RV No* 00 43 02.433 +41 12 56.17           M0 108 0
3 NAME NGC 300 OT2008-1 ev 00 54 34.16 -37 38 28.6           ~ 118 1
4 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1426 2
5 NAME UGC 2773 OT2009-1 SN? 03 32 07.24 +47 47 39.6           ~ 50 1
6 V* V838 Mon No* 07 04 04.8221494992 -03 50 50.648894412       15.181 14.51 M10+B3V 404 0
7 SN 1954J SN* 07 36 56.20 +65 37 52.3   16.3 16.50     SNIIpec? 91 2
8 HD 90177 s*b 10 22 53.8430096928 -59 37 28.363616256 9.16 9.66 8 8.15   LBV 320 0
9 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 971 2
10 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2355 0
11 NAME M85 OT2006-1 No* 12 25 23.82 +18 10 56.2     19.30     ~ 62 1
12 M 85 GiP 12 25 24.053 +18 11 27.89   10.2       ~ 628 0
13 NGC 4485 GiP 12 30 31.113 +41 42 04.22 12.10 12.42 11.93 11.93   ~ 267 2
14 NGC 4490 GiP 12 30 36.368 +41 38 37.07 10.03 10.22 9.79     ~ 553 3
15 SN 2008ax SN* 12 30 40.80 +41 38 16.1   23.6 23.5 14.1 22.6 SNIIb 242 1
16 NAME NGC 4490-OT2011 ev 12 30 41.85 +41 37 49.8           ~ 35 0
17 V* V1309 Sco No* 17 57 32.9368332984 -30 43 09.965039880   16.9   14.8   ~ 224 0
18 EWS 2002-BLG-360 CV* 17 57 39.0404346105 -29 46 05.762196592           ~ 35 0
19 V* V1148 Sgr CV* 18 09 05.8470647232 -25 59 08.077040268           ~ 32 0
20 HD 168625 s*b 18 21 19.5484021368 -16 22 26.075142156 10.15 9.78 8.37 8.76   B6Iap 269 2
21 V* V4332 Sgr CV* 18 50 36.6958376520 -21 23 28.925017944         14.37 K8/M0e 162 0
22 V* CK Vul CV* 19 47 37.9577343864 +27 18 41.792401368           ~ 126 0
23 SN 2008S ev 20 34 45.33 +60 05 58.4   19.89 18.79 17.93   SNIIn? 229 1

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2022.12.10-09:56:09

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