ASASSN-18ey: The Rise of a New Black-Hole X-ray Binary
| Autor: | John L. Tonry, John F. Beacom, L. Denneau, Michael A. Tucker, A. N. Heinze, Kristen C. Dage, Subo Dong, H. Weiland, A. Rest, Thomas W.-S. Holoien, B. Stalder, Laura Chomiuk, Arash Bahramian, Todd A. Thompson, J. V. Shields, J. L. Prieto, K. W. Smith, Benjamin J. Shappee, Asas-Sn, H. Flewelling, Katie Auchettl, Christopher S. Kochanek, Krzysztof Z. Stanek, Jay Strader, D. M. Rowan, M. E. Huber |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
astro-ph.HE High Energy Astrophysical Phenomena (astro-ph.HE) Astrophysics and Astronomy astro-ph.SR 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena X-ray binary FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences Accretion (astrophysics) Black hole Accretion disc Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) |
| Popis: | We present the discovery of ASASSN-18ey (MAXI J1820+070), a new black hole low-mass X-ray binary 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 (ATLAS) 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 outburst, as has been seen in several other systems, the start of the outburst in the optical preceded that in the X-rays by $7.20\pm0.97~\rm days$. We analyze the spectroscopic evolution of ASASSN-18ey from pre-maximum to $> 100~\rm days$ post-maximum. The spectra of ASASSN-18ey exhibit broad, asymmetric, double-peaked H$\alpha$ emission. The Bowen blend ($\lambda \approx 4650$\AA) 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. Comment: 10 pages, 5 figures, accepted by ApJL. A summary video describing this publication can be found at https://youtu.be/YbM_koBfRSI |
| Databáze: | OpenAIRE |
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