2021ApJ...920..120Y


Query : 2021ApJ...920..120Y

2021ApJ...920..120Y - Astrophys. J., 920, 120-120 (2021/October-3)

Multi-wavelength observations of AT2019wey: a new candidate black hole low-mass X-ray binary.

YAO Y., KULKARNI S.R., BURDGE K.B., CAIAZZO I., DE K., DONG D., FREMLING C., KASLIWAL M.M., KUPFER T., VAN ROESTEL J., SOLLERMAN J., BAGDASARYAN A., BELLM E.C., CENKO S.B., DRAKE A.J., DUEV D.A., GRAHAM M.J., KAYE S., MASCI F.J., MIRANDA N., PRINCE T.A., RIDDLE R., RUSHOLME B. and SOUMAGNAC M.T.

Abstract (from CDS):

AT2019wey (SRGA J043520.9+552226, SRGE J043523.3+552234) is a transient first reported by the ATLAS optical survey in 2019 December. It rose to prominence upon detection, three months later, by the Spektrum-Roentgen-Gamma (SRG) mission in its first all-sky survey. X-ray observations reported in Yao et al. suggest that AT2019wey is a Galactic low-mass X-ray binary (LMXB) with a black hole (BH) or neutron star (NS) accretor. Here we present ultraviolet, optical, near-infrared, and radio observations of this object. We show that the companion is a short-period (P <= 16 hr) low-mass (<1 M) star. We consider AT2019wey to be a candidate BH system since its locations on the Lradio-LX and Lopt-LX diagrams are closer to BH binaries than NS binaries. We demonstrate that from 2020 June to August, despite the more than 10 times brightening at radio and X-ray wavelengths, the optical luminosity of AT2019wey only increased by 1.3-1.4 times. We interpret the UV/optical emission before the brightening as thermal emission from a truncated disk in a hot accretion flow and the UV/optical emission after the brightening as reprocessing of the X-ray emission in the outer accretion disk. AT2019wey demonstrates that combining current wide-field optical surveys and SRG provides a way to discover the emerging population of short-period BH LMXB systems with faint X-ray outbursts.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Low-mass x-ray binary stars - Accretion - Astrophysical black holes - Sky surveys

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

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 21942 * 03 34 15.8825755704 +47 16 33.347782056   9.46 9.27     A0V 24 0
2 V* V518 Per HXB 04 21 42.7227473352 +32 54 26.939156184 13.00 13.50 13.2     M4.5V 649 1
3 ATLAS 19bcxp LXB 04 35 23.280 +55 22 34.25           ~ 33 0
4 V* KV UMa HXB 11 18 10.7930420496 +48 02 12.314730120     12.25     K5V-M1V 811 0
5 CRTS J135716.8-093238 HXB 13 57 16.8357790008 -09 32 38.796487512           M4.5V 162 0
6 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1871 1
7 XTE J1752-223 LXB 17 52 15.090 -22 20 32.36           ~ 206 0
8 2MAXI J1753-013 LXB 17 53 28.2898766424 -01 27 06.256555272 15.30 16.73 16.46 16.15 15.64 ~ 354 0
9 MAXI J1820+070 LXB 18 20 21.9423816480 +07 11 07.284859440           ~ 326 0
10 MAXI J1836-194 XB* 18 35 43.440 -19 19 10.48           ~ 139 0
11 V* V406 Vul HXB 18 58 41.580 +22 39 29.40 15.00 15.65 15.31     G5V-K0V 372 0

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