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Title: ASASSN-18ey: The Rise of a New Black Hole X-Ray Binary

Abstract

We present the discovery of ASASSN-18ey (MAXI J1820+070), a new black hole low-mass X-ray binary (LMXB) discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN). A week after ASAS-SN discovered ASASSN-18ey as an optical transient, it was detected as an X-ray transient by MAXI/GCS. Here, we analyze ASAS-SN and Asteroid Terrestrial-impact Last Alert System pre-outburst optical light curves, finding evidence of intrinsic variability for several years prior to the outburst. While there was no long-term rise leading to the outburst, as has been seen in several other systems, the start of the outburst in the optical preceded that in the X-rays by 7.20 ± 0.97 days. Here, we analyze the spectroscopic evolution of ASASSN-18ey from pre-maximum to >100 days post-maximum. The spectra of ASASSN-18ey exhibit broad, asymmetric, double-peaked Hα emission. The Bowen blend (λ ≈ 4650 Å) in the post-maximum spectra shows highly variable double-peaked profiles, likely arising from irradiation of the companion by the accretion disk, typical of low-mass X-ray binaries. The optical and X-ray luminosities of ASASSN-18ey are consistent with black hole low-mass X-ray binaries, both in outburst and quiescence.

Authors:
ORCiD logo [1];  [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [4]; ORCiD logo [4]; ORCiD logo [5];  [6];  [7];  [4];  [4]; ORCiD logo [4]; ORCiD logo [8];  [1]; ORCiD logo [1]; ORCiD logo [1];  [9]; ORCiD logo [10];  [1] more »;  [1];  [11]; ORCiD logo [1]; ORCiD logo [12]; ORCiD logo [8] « less
  1. Univ. of Hawai'i, Honolulu, HI (United States)
  2. The Observatories of the Carnegie Inst. for Science, Pasadena, CA (United States)
  3. The Ohio State Univ., Columbus, OH (United States); Univ. of Copenhagen, Copenhagen (Denmark)
  4. The Ohio State Univ., Columbus, OH (United States)
  5. Michigan State Univ., East Lansing, MI (United States); Curtin Univ., Perth (Australia)
  6. Peking Univ., Beijing (People's Republic of China)
  7. Univ. Diego Portales, Santiago (Chile); Millennium Institute of Astrophysics, Santiago (Chile)
  8. Michigan State Univ., East Lansing, MI (United States)
  9. Queens Univ. Belfast, Belfast (United Kingdom)
  10. LSST, Tucson, AZ (United States)
  11. Space Telescope Science Inst., Baltimore, MD (United States)
  12. Univ. of Hawai'i, Honolulu, HI (United States); Harvard College, Haverford, PA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE
Contributing Org.:
ASAS-SN; ATLAS
OSTI Identifier:
1544097
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 867; Journal Issue: 1; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; accretion; accretion disks; stars: black holes; X-rays: binaries

Citation Formats

Tucker, M. A., Shappee, B. J., Holoien, T. W. -S., Auchettl, K., Strader, J., Stanek, K. Z., Kochanek, C. S., Bahramian, A., Dong, Subo, Prieto, J. L., Shields, J., Thompson, Todd A., Beacom, John F., Chomiuk, L., Denneau, L., Flewelling, H., Heinze, A. N., Smith, K. W., Stalder, B., Tonry, J. L., Weiland, H., Rest, A., Huber, M. E., Rowan, D. M., and Dage, K. ASASSN-18ey: The Rise of a New Black Hole X-Ray Binary. United States: N. p., 2018. Web. doi:10.3847/2041-8213/aae88a.
Tucker, M. A., Shappee, B. J., Holoien, T. W. -S., Auchettl, K., Strader, J., Stanek, K. Z., Kochanek, C. S., Bahramian, A., Dong, Subo, Prieto, J. L., Shields, J., Thompson, Todd A., Beacom, John F., Chomiuk, L., Denneau, L., Flewelling, H., Heinze, A. N., Smith, K. W., Stalder, B., Tonry, J. L., Weiland, H., Rest, A., Huber, M. E., Rowan, D. M., & Dage, K. ASASSN-18ey: The Rise of a New Black Hole X-Ray Binary. United States. doi:10.3847/2041-8213/aae88a.
Tucker, M. A., Shappee, B. J., Holoien, T. W. -S., Auchettl, K., Strader, J., Stanek, K. Z., Kochanek, C. S., Bahramian, A., Dong, Subo, Prieto, J. L., Shields, J., Thompson, Todd A., Beacom, John F., Chomiuk, L., Denneau, L., Flewelling, H., Heinze, A. N., Smith, K. W., Stalder, B., Tonry, J. L., Weiland, H., Rest, A., Huber, M. E., Rowan, D. M., and Dage, K. Mon . "ASASSN-18ey: The Rise of a New Black Hole X-Ray Binary". United States. doi:10.3847/2041-8213/aae88a. https://www.osti.gov/servlets/purl/1544097.
@article{osti_1544097,
title = {ASASSN-18ey: The Rise of a New Black Hole X-Ray Binary},
author = {Tucker, M. A. and Shappee, B. J. and Holoien, T. W. -S. and Auchettl, K. and Strader, J. and Stanek, K. Z. and Kochanek, C. S. and Bahramian, A. and Dong, Subo and Prieto, J. L. and Shields, J. and Thompson, Todd A. and Beacom, John F. and Chomiuk, L. and Denneau, L. and Flewelling, H. and Heinze, A. N. and Smith, K. W. and Stalder, B. and Tonry, J. L. and Weiland, H. and Rest, A. and Huber, M. E. and Rowan, D. M. and Dage, K.},
abstractNote = {We present the discovery of ASASSN-18ey (MAXI J1820+070), a new black hole low-mass X-ray binary (LMXB) discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN). A week after ASAS-SN discovered ASASSN-18ey as an optical transient, it was detected as an X-ray transient by MAXI/GCS. Here, we analyze ASAS-SN and Asteroid Terrestrial-impact Last Alert System pre-outburst optical light curves, finding evidence of intrinsic variability for several years prior to the outburst. While there was no long-term rise leading to the outburst, as has been seen in several other systems, the start of the outburst in the optical preceded that in the X-rays by 7.20 ± 0.97 days. Here, we analyze the spectroscopic evolution of ASASSN-18ey from pre-maximum to >100 days post-maximum. The spectra of ASASSN-18ey exhibit broad, asymmetric, double-peaked Hα emission. The Bowen blend (λ ≈ 4650 Å) in the post-maximum spectra shows highly variable double-peaked profiles, likely arising from irradiation of the companion by the accretion disk, typical of low-mass X-ray binaries. The optical and X-ray luminosities of ASASSN-18ey are consistent with black hole low-mass X-ray binaries, both in outburst and quiescence.},
doi = {10.3847/2041-8213/aae88a},
journal = {The Astrophysical Journal. Letters},
number = 1,
volume = 867,
place = {United States},
year = {2018},
month = {10}
}

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