Yao, Yuhan and Kulkarni, S. R. and Burdge, Kevin B. and Caiazzo, Ilaria and De, Kishalay and Dong, Dillon and Kasliwal, Mansi M. and Kupfer, Thomas and van Roestel, Jan and Sollerman, Jesper and Bagdasaryan, Ashot and Bellm, Eric C. and Cenko, S. Bradley and Drake, Andrew J. and Duev, Dmitry A. and Fremling, C. and Graham, Matthew J. and Kaye, Stephen and Masci, Frank J. and Miranda, Nicolas and Prince, Thomas A. and Riddle, Reed and Rusholme, Ben and Soumagnac, Maayane T. (2020) Multi-wavelength Observations of AT2019wey: a New Candidate Black Hole Low-mass X-Ray Binary. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20210106-131320879
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Abstract
AT2019wey (ATLAS19bcxp, SRGA J043520.9+552226, SRGE J043523.3+552234, ZTF19acwrvzk) is a transient reported by the ATLAS optical survey in December 2019, but shot to fame upon detection, three months later, by the Spektrum-Roentgen-Gamma (SRG) mission in its on-going sky survey. Here we present our ultraviolet, optical, near-infrared and radio observations of this object. Our X-ray observations are reported in a separate paper. We conclude that AT2019wey is a newly discovered Galactic low-mass X-ray binary (LMXB) and a candidate black hole (BH) system. Remarkably, we demonstrate that from ~58950 MJD to ~59100 MJD, despite the significant brightening in radio and X-ray (more than a factor of 10), the optical luminosity of AT2019wey only increased by 1.3--1.4. We interpret the bright UV/optical source in the dim low/hard state (~58950 MJD) as thermal emission from a truncated disk in a hot accretion flow, and the UV/optical emission in the hard-intermediate state (~59100 MJD) as reprocessing of X-ray flux in the outer accretion disk. We discuss the power of combining current wide-field optical surveys and SRG in the discovery of the emerging population of short-period BH LMXB systems with low accretion rates.
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Additional Information: | We thank Jakob Nordin for a careful reading of this manuscript. YY is supported in part by the Heising-Simons Foundation. MMK acknowledges generous support from the David and Lucille Packard Foundation. ECB is supported in part by the NSF AAG grant 1812779 and grant #2018-0908 from the Heising-Simons Foundation. This work is based on observations obtained with the Samuel Oschin Telescope 48 inch and the 60 inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under grant No. AST-1440341 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, the University of Washington, Deutsches Elektronen-Synchrotron and Humboldt University, Los Alamos National Laboratories, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, and Lawrence Berkeley National Laboratories. Operations are conducted by COO, IPAC, and UW. SED Machine is based upon work supported by the National Science Foundation under Grant No. 1106171. This work was supported by the GROWTH project funded by the National Science Foundation under Grant No 1545949. | ||||||||||||||||||||||||||||||||||||||||||||
Group: | Astronomy Department, Infrared Processing and Analysis Center (IPAC), Zwicky Transient Facility | ||||||||||||||||||||||||||||||||||||||||||||
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Subject Keywords: | X-rays: individual (AT2019wey); accretion, accretion disks; stars: black holes | ||||||||||||||||||||||||||||||||||||||||||||
Record Number: | CaltechAUTHORS:20210106-131320879 | ||||||||||||||||||||||||||||||||||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20210106-131320879 | ||||||||||||||||||||||||||||||||||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||||||||||||||||||||||
ID Code: | 107348 | ||||||||||||||||||||||||||||||||||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||||||||||||||||||||||||||||||||||
Deposited By: | George Porter | ||||||||||||||||||||||||||||||||||||||||||||
Deposited On: | 08 Jan 2021 22:10 | ||||||||||||||||||||||||||||||||||||||||||||
Last Modified: | 05 Feb 2021 20:29 |
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