Details

Autor(en) / Beteiligte

• 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.

Titel

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

Ist Teil von

• Astrophysical journal. Letters, 2018-11, Vol.867 (1), p.L9

Ort / Verlag

Austin: The American Astronomical Society

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• 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 H emission. The Bowen blend (λ 4650 ) 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.