2020MNRAS.496.5503B


Query : 2020MNRAS.496.5503B

2020MNRAS.496.5503B - Mon. Not. R. Astron. Soc., 496, 5503-5517 (2020/August-3)

Progenitor, precursor, and evolution of the dusty remnant of the stellar merger M31-LRN-2015.

BLAGORODNOVA N., KARAMBELKAR V., ADAMS S.M., KASLIWAL M.M., KOCHANEK C.S., DONG S., CAMPBELL H., HODGKIN S., JENCSON J.E., JOHANSSON J., KOZLOWSKI S., LAHER R.R., MASCI F., NUGENT P. and REBBAPRAGADA U.

Abstract (from CDS):

M31-LRN-2015 is a likely stellar merger discovered in the Andromeda Galaxy in 2015. We present new optical to mid-infrared photometry and optical spectroscopy for this event. Archival data show that the source started to brighten ∼2 yr before the nova event. During this precursor phase, the source brightened by ∼3 mag. The light curve at 6 and 1.5 months before the main outburst may show periodicity, with periods of 16 ± 0.3 and 28.1 ± 1.4 d, respectively. This complex emission may be explained by runaway mass-loss from the system after the binary undergoes Roche lobe overflow, leading the system to coalesce in tens of orbital periods. While the progenitor spectral energy distribution shows no evidence of pre-existing warm dust in the system, the remnant forms an optically thick dust shell at approximately four months after the outburst peak. The optical depth of the shell increases dramatically after 1.5 yr, suggesting the existence of shocks that enhance the dust formation process. We propose that the merger remnant is likely an inflated giant obscured by a cooling shell of gas with mass ∼0.2 M ejected at the onset of the common envelope phase.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): binaries: close - stars: evolution - dust, extinction - ISM: jets and outflows - transients: novae

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 10

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Number of rows : 10
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 M31N 2015-01a No* 00 42 07.99 +40 55 01.1           ~ 53 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12173 1
3 V* V838 Mon No* 07 04 04.8221494992 -03 50 50.648894412       15.181 14.51 M10+B3V 410 0
4 V* R Leo Mi* 09 47 33.4839808805 +11 25 43.823283729 9.22 8.94 7.53 3.39 0.12 M7-9e 897 1
5 SN 2017jfs SN* 12 29 37.78 +07 49 35.1           SNIIn 18 0
6 NAME M51 OT2019-1 ev 13 29 42.394 +47 11 16.99           ~ 20 0
7 NAME M101 OT2015-1 SN? 14 02 16.78 +54 26 20.5   19.19 17.57 16.92 16.26 ~ 43 0
8 V* V1309 Sco No* 17 57 32.9368332984 -30 43 09.965039880   16.9   14.8   ~ 231 0
9 EWS 2002-BLG-360 CV* 17 57 39.0404346105 -29 46 05.762196592           ~ 35 0
10 V* V4332 Sgr CV* 18 50 36.6958376520 -21 23 28.925017944         14.37 K8/M0e 163 0

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2023.03.29-21:33:01

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