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Multi-wavelength Observations of AT2019wey: a New Candidate Black Hole Low-mass X-Ray Binary

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 (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20210106-131320879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.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/2012.00169arXivDiscussion Paper
ORCID:
AuthorORCID
Yao, Yuhan0000-0001-6747-8509
Kulkarni, S. R.0000-0001-5390-8563
Burdge, Kevin B.0000-0002-7226-836X
Caiazzo, Ilaria0000-0002-4770-5388
De, Kishalay0000-0002-8989-0542
Dong, Dillon0000-0001-9584-2531
Kasliwal, Mansi M.0000-0002-5619-4938
Kupfer, Thomas0000-0002-6540-1484
van Roestel, Jan0000-0002-2626-2872
Sollerman, Jesper0000-0003-1546-6615
Bellm, Eric C.0000-0001-8018-5348
Cenko, S. Bradley0000-0003-1673-970X
Duev, Dmitry A.0000-0001-5060-8733
Fremling, C.0000-0002-4223-103X
Graham, Matthew J.0000-0002-3168-0139
Masci, Frank J.0000-0002-8532-9395
Miranda, Nicolas0000-0001-6070-7540
Prince, Thomas A.0000-0002-8850-3627
Riddle, Reed0000-0002-0387-370X
Rusholme, Ben0000-0001-7648-4142
Soumagnac, Maayane T.0000-0001-6753-1488
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
Funders:
Funding AgencyGrant Number
Heising-Simons Foundation2018-0908
David and Lucile Packard FoundationUNSPECIFIED
NSFAST-1812779
NSFAST-1440341
ZTF partner institutionsUNSPECIFIED
NSFAST-1106171
NSFOISE-1545949
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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