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A Mildly Relativistic Outflow from the Energetic, Fast-rising Blue Optical Transient CSS161010 in a Dwarf Galaxy
- Coppejans, D. L. (author)
- Margutti, R. (author)
- Terreran, G. (author)
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- Nayana, A. J. (author)
- Coughlin, E. R. (author)
- Laskar, T. (author)
- Alexander, K. D. (author)
- Bietenholz, M. (author)
- Caprioli, D. (author)
- Chandra, P. (author)
- Drout, M. R. (author)
- Frederiks, D. (author)
- Frohmaier, C. (author)
- Hurley, K. H. (author)
- Kochanek, C. S. (author)
- MacLeod, M. (author)
- Meisner, A. (author)
- Nugent, P. E. (author)
- Ridnaia, A. (author)
- Sand, D. J. (author)
- Svinkin, D. (author)
- Ward, C. (author)
- Baldeschi, A. (author)
- Chilingarian, I. (author)
- Dong, Y. (author)
- Esquivia, C. (author)
- Fong, W. (author)
- Guidorzi, C. (author)
- Milisavljevic, D. (author)
- Paterson, K. (author)
- Reichart, D. E. (author)
- Shappee, B. (author)
- Stroh, M. C. (author)
- Valenti, S. (author)
- Zauderer, B. A. (author)
- Zhang, B. (author)
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- (creator_code:org_t)
- 2020-05-26
- 2020
- English.
- In: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 2041-8213. ; 895:1
- Journal article (peer-reviewed)
Abstract
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- We present X-ray and radio observations of the Fast Blue Optical Transient CRTS-CSS161010 J045834-081803 (CSS161010 hereafter) at t = 69-531 days. CSS161010 shows luminous X-ray (L-x similar to 5 x 10(39) erg s(-1)) and radio (L-nu similar to 10(29) erg s(-1) Hz(-1)) emission. The radio emission peaked at similar to 100 days post-transient explosion and rapidly decayed. We interpret these observations in the context of synchrotron emission from an expanding blast wave. CSS161010 launched a mildly relativistic outflow with velocity Gamma beta c >= 0.55c at similar to 100 days. This is faster than the non-relativistic AT 2018cow (Gamma beta c similar to 0.1c) and closer to ZTF18abvkwla (Gamma beta c >= 0.3c at 63 days). The inferred initial kinetic energy of CSS161010 (E-k greater than or similar to 10(51) erg) is comparable to that of long gamma-ray bursts, but the ejecta mass that is coupled to the mildly relativistic outflow is significantly larger (similar to 0.01-.1 M-circle dot). This is consistent with the lack of observed gamma-rays. The luminous X-rays were produced by a different emission component to the synchrotron radio emission. CSS161010 is located at similar to 150 Mpc in a dwarf galaxy with stellar mass M-* similar to 10(7) M-circle dot and specific star formation rate sSFR similar to 0.3 Gyr(-1). This mass is among the lowest inferred for host galaxies of explosive transients from massive stars. Our observations of CSS161010 are consistent with an engine-driven aspherical explosion from a rare evolutionary path of a H-rich stellar progenitor, but we cannot rule out a stellar tidal disruption event on a centrally located intermediate-mass black hole. Regardless of the physical mechanism, CSS161010 establishes the existence of a new class of rare (rate < 0.4% of the local core-collapse supernova rate) H-rich transients that can launch mildly relativistic outflows.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Supernovae
- Accretion
- Black holes
- X-ray transient sources
- Radio transient sources
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Coppejans, D. L.
- Margutti, R.
- Terreran, G.
- Nayana, A. J.
- Coughlin, E. R.
- Laskar, T.
- show more...
- Alexander, K. D.
- Bietenholz, M.
- Caprioli, D.
- Chandra, P.
- Drout, M. R.
- Frederiks, D.
- Frohmaier, C.
- Hurley, K. H.
- Kochanek, C. S.
- MacLeod, M.
- Meisner, A.
- Nugent, P. E.
- Ridnaia, A.
- Sand, D. J.
- Svinkin, D.
- Ward, C.
- Yang, Sheng
- Baldeschi, A.
- Chilingarian, I.
- Dong, Y.
- Esquivia, C.
- Fong, W.
- Guidorzi, C.
- Lundqvist, Peter
- Milisavljevic, D ...
- Paterson, K.
- Reichart, D. E.
- Shappee, B.
- Stroh, M. C.
- Valenti, S.
- Zauderer, B. A.
- Zhang, B.
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