2019ApJ...878...82V


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST02:37:22

2019ApJ...878...82V - Astrophys. J., 878, 82-82 (2019/June-3)

Late-time UV observations of tidal disruption flares reveal unobscured, compact accretion disks.

VAN VELZEN S., STONE N.C., METZGER B.D., GEZARI S., BROWN T.M. and FRUCHTER A.S.

Abstract (from CDS):

The origin of thermal optical and UV emission from stellar tidal disruption flares (TDFs) remains an open question. We present Hubble Space Telescope far-UV (FUV) observations of eight optical/UV-selected TDFs 5-10 yr post-peak. Six sources are cleanly detected, showing point-like FUV emission (1041.5–42.5ergs–1) from the centers of their host galaxies. We discover that the light curves of TDFs from low-mass black holes (<106.5 M) show significant late-time flattening. Conversely, FUV light curves from high-mass black hole TDFs are generally consistent with an extrapolation from the early-time light curve. The observed late-time emission cannot be explained by existing models for early-time TDF light curves (i.e., reprocessing or circularization shocks), but is instead consistent with a viscously spreading, unobscured accretion disk. These disk models can only reproduce the observed FUV luminosities, however, if they are assumed to be thermally and viscously stable, in contrast to the simplest predictions of α-disk theory. For one TDF in our sample, we measure an upper limit to the UV luminosity that is significantly lower than expectations from theoretical modeling and an extrapolation of the early-time light curve. This dearth of late-time emission could be due to a disk instability/state change absent in the rest of the sample. The disk models that explain the late-time UV detections solve the TDF "missing energy problem" by radiating a rest-mass energy of ∼0.1 M over a period of decades, primarily in extreme UV wavelengths.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): accretion, accretion disks - galaxies: active - galaxies: nuclei - quasars: supermassive black holes - ultraviolet: galaxies

Simbad objects: 19

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Number of rows : 19

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 NAME AT 2016fnl ev 00 29 57.04 +32 53 37.5           ~ 59 0
2 VIDEO J022516.97-043258.91 G 02 25 16.98 -04 32 58.9           ~ 25 0
3 PTF 15af SN* 08 48 28.13 +22 03 33.4           ~ 30 0
4 PS1-11af ev 09 57 26.815 +03 14 01.00           ~ 53 0
5 NGC 3156 GiG 10 12 41.2459118495 +03 07 45.693904357   12.8       ~ 223 0
6 ASASSN -14ae SN* 11 08 40.11 +34 05 52.4           ~ 76 0
7 LEDA 43234 G 12 48 15.2244073438 +17 46 26.496619532   16.5       ~ 164 0
8 [GBM2008] D3-13 G 14 19 29.80863 +52 52 06.3650   22.16   20.139 19.580 ~ 41 0
9 PTF 09axc SN* 14 53 13.06 +22 14 32.2           SNII 37 0
10 PSN K0905-001 SN? 14 57 03.10 +49 36 40.8           ~ 57 0
11 PS1-10jh ev 16 09 28.296 +53 40 23.52           ~ 110 0
12 PTF 09djl SN* 16 33 55.94 +30 14 16.3           SNII 48 0
13 iPTF 16axa ev 17 03 34.36 +30 35 36.8           ~ 31 0
14 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2368 0
15 ASASSN -15oi SN* 20 39 09.096 -30 45 20.71           ~ 69 0
16 SN 2015L ? 22 02 15.45 -61 39 34.6           ~ 118 2
17 [VFG2011] TDE2 ev 23 23 48.615 -01 08 10.34           ~ 16 0
18 [GHC2009] D23H-1 G 23 31 59.536 +00 17 14.58   20.67   19.30 18.83 ~ 20 0
19 [VFG2011] TDE1 ev 23 42 01.406 +01 06 29.30           ~ 15 0

    Equat.    Gal    SGal    Ecl

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2021.05.17-02:37:22

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