| Title | ASASSN-18ey: The Rise of a New Black Hole X-Ray Binary |
| Authors | 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. |
| Affiliation | Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA. Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA. Ohio State Univ, Ctr Cosmol & AstroParticle Phys CCAPP, 191 W Woodruff Ave, Columbus, OH 43210 USA. Ohio State Univ, Dept Phys, 191 W Woodruff Ave, Columbus, OH 43210 USA. Univ Copenhagen, Dark Cosmol Ctr, Niels Bohr Inst, Blegdamsvej 17, DK-2100 Copenhagen, Denmark. Michigan State Univ, Dept Phys & Astron, 567 Wilson Rd, E Lansing, MI 48824 USA. Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA. Curtin Univ, Int Ctr Radio Astron Res, GPO Box U1987, Perth, WA 6845, Australia. Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Rd 5, Beijing 100871, Peoples R China. Univ Diego Portales, Nucleo Astron, Fac Ingn & Ciencias, Ave Ejercito 441, Santiago, Chile. Millennium Inst Astrophys, Santiago, Chile. Queens Univ Belfast, Sch Math & Phys, Astrophys Res Ctr, Belfast BT7 1NN, Antrim, North Ireland. LSST, 950 North Cherry Ave, Tucson, AZ 85719 USA. Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA. Haverford Coll, Dept Phys & Astron, 370 Lancaster Ave, Haverford, PA 19041 USA. |
| Keywords | accretion, accretion disks stars: black holes X-rays: binaries SWIFT ULTRAVIOLET/OPTICAL TELESCOPE DISC INSTABILITY MODEL LIGHT CURVES OUTBURST MISSION SPECTROGRAPH CALIBRATION TRANSIENTS MAXI ISS |
| Issue Date | 2018 |
| Publisher | ASTROPHYSICAL JOURNAL LETTERS |
| Citation | ASTROPHYSICAL JOURNAL LETTERS. 2018, 867(1). |
| 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. 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 Ha emission. The Bowen blend (lambda approximate to 4650 angstrom) 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. |
| URI | http://hdl.handle.net/20.500.11897/568217 |
| ISSN | 2041-8205 |
| DOI | 10.3847/2041-8213/aae88a |
| Indexed | SCI(E) |
| Appears in Collections: | 科维理天文与天体物理研究所 |
